using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using Vanara.Extensions;
using Vanara.InteropServices;
namespace Vanara.PInvoke
{
public static partial class Kernel32
{
///
/// Starts the asynchronous operation of sending a control code directly to a specified device driver, causing the corresponding
/// device to perform the corresponding operation.
///
/// The type of the .
/// The type of the .
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
///
/// A pointer to the input buffer that contains the data required to perform the operation. The format of this data depends on the
/// value of the dwIoControlCode parameter.
/// This parameter can be NULL if dwIoControlCode specifies an operation that does not require input data.
///
///
/// A pointer to the output buffer that is to receive the data returned by the operation. The format of this data depends on the
/// value of the dwIoControlCode parameter.
/// This parameter can be NULL if dwIoControlCode specifies an operation that does not return data.
///
/// An AsyncCallback delegate that references the method to invoke when the operation is complete.
/// An IAsyncResult instance that references the asynchronous request.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static IAsyncResult BeginDeviceIoControl(HFILE hDevice, uint dwIoControlCode, TIn? inVal, TOut? outVal, AsyncCallback userCallback) where TIn : struct where TOut : struct
{
var buffer = Pack(inVal, outVal);
return BeginDeviceIoControl(hDevice, dwIoControlCode, buffer, userCallback, null);
}
///
/// Starts the asynchronous operation of sending a control code directly to a specified device driver, causing the corresponding
/// device to perform the corresponding operation.
///
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
/// The input buffer required to perform the operation. Can be null if unnecessary.
/// The output buffer that is to receive the data returned by the operation. Can be null if unnecessary.
/// An AsyncCallback delegate that references the method to invoke when the operation is complete.
/// An IAsyncResult instance that references the asynchronous request.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static IAsyncResult BeginDeviceIoControl(HFILE hDevice, uint dwIoControlCode, byte[] inputBuffer, byte[] outputBuffer, AsyncCallback userCallback)
{
var buffer = Pack(inputBuffer, outputBuffer);
return BeginDeviceIoControl(hDevice, dwIoControlCode, buffer, userCallback, null);
}
///
///
/// Cancels all pending input and output (I/O) operations that are issued by the calling thread for the specified file. The function
/// does not cancel I/O operations that other threads issue for a file handle.
///
/// To cancel I/O operations from another thread, use the CancelIoEx function.
///
///
/// A handle to the file.
/// The function cancels all pending I/O operations for this file handle.
///
///
///
/// If the function succeeds, the return value is nonzero. The cancel operation for all pending I/O operations issued by the calling
/// thread for the specified file handle was successfully requested. The thread can use the GetOverlappedResult function to
/// determine when the I/O operations themselves have been completed.
///
/// If the function fails, the return value is zero (0). To get extended error information, call the GetLastError function.
///
// BOOL WINAPI CancelIo( _In_ HANDLE hFile);// https://msdn.microsoft.com/en-us/library/windows/desktop/aa363791(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "aa363791")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool CancelIo([In] HFILE hFile);
///
/// Marks any outstanding I/O operations for the specified file handle. The function only cancels I/O operations in the current
/// process, regardless of which thread created the I/O operation.
///
/// A handle to the file.
///
/// A pointer to an OVERLAPPED data structure that contains the data used for asynchronous I/O.
/// If this parameter is NULL, all I/O requests for the hFile parameter are canceled.
///
/// If this parameter is not NULL, only those specific I/O requests that were issued for the file with the specified
/// lpOverlapped overlapped structure are marked as canceled, meaning that you can cancel one or more requests, while the
/// CancelIo function cancels all outstanding requests on a file handle.
///
///
///
///
/// If the function succeeds, the return value is nonzero. The cancel operation for all pending I/O operations issued by the calling
/// process for the specified file handle was successfully requested. The application must not free or reuse the OVERLAPPED
/// structure associated with the canceled I/O operations until they have completed. The thread can use the
/// GetOverlappedResult function to determine when the I/O operations themselves have been completed.
///
/// If the function fails, the return value is 0 (zero). To get extended error information, call the GetLastError function.
/// If this function cannot find a request to cancel, the return value is 0 (zero), and GetLastError returns ERROR_NOT_FOUND.
///
// BOOL WINAPI CancelIoEx( _In_ HANDLE hFile, _In_opt_ LPOVERLAPPED lpOverlapped);// https://msdn.microsoft.com/en-us/library/windows/desktop/aa363792(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "aa363792")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool CancelIoEx([In] HFILE hFile, [In] NativeOverlapped* lpOverlapped);
/// Marks pending synchronous I/O operations that are issued by the specified thread as canceled.
/// A handle to the thread.
///
/// If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is 0 (zero). To get extended error information, call the GetLastError function.
/// If this function cannot find a request to cancel, the return value is 0 (zero), and GetLastError returns ERROR_NOT_FOUND.
///
// BOOL WINAPI CancelSynchronousIo( _In_ HANDLE hThread); https://msdn.microsoft.com/en-us/library/windows/desktop/aa363794(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "aa363794")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool CancelSynchronousIo([In] HTHREAD hThread);
///
///
/// Creates an input/output (I/O) completion port and associates it with a specified file handle, or creates an I/O completion port
/// that is not yet associated with a file handle, allowing association at a later time.
///
///
/// Associating an instance of an opened file handle with an I/O completion port allows a process to receive notification of the
/// completion of asynchronous I/O operations involving that file handle.
///
///
///
/// An open file handle or INVALID_HANDLE_VALUE.
/// The handle must be to an object that supports overlapped I/O.
///
/// If a handle is provided, it has to have been opened for overlapped I/O completion. For example, you must specify the
/// FILE_FLAG_OVERLAPPED flag when using the CreateFile function to obtain the handle.
///
///
/// If INVALID_HANDLE_VALUE is specified, the function creates an I/O completion port without associating it with a file
/// handle. In this case, the ExistingCompletionPort parameter must be NULL and the CompletionKey parameter is ignored.
///
///
///
/// A handle to an existing I/O completion port or NULL.
///
/// If this parameter specifies an existing I/O completion port, the function associates it with the handle specified by the
/// FileHandle parameter. The function returns the handle of the existing I/O completion port if successful; it does not create a new
/// I/O completion port.
///
///
/// If this parameter is NULL, the function creates a new I/O completion port and, if the FileHandle parameter is valid,
/// associates it with the new I/O completion port. Otherwise no file handle association occurs. The function returns the handle to
/// the new I/O completion port if successful.
///
///
///
/// The per-handle user-defined completion key that is included in every I/O completion packet for the specified file handle. For
/// more information, see the Remarks section.
///
///
///
/// The maximum number of threads that the operating system can allow to concurrently process I/O completion packets for the I/O
/// completion port. This parameter is ignored if the ExistingCompletionPort parameter is not NULL.
///
/// If this parameter is zero, the system allows as many concurrently running threads as there are processors in the system.
///
///
/// If the function succeeds, the return value is the handle to an I/O completion port:
///
/// -
///
///
/// -
///
///
/// -
///
///
///
///
/// If the function fails, the return value is NULL. To get extended error information, call the GetLastError function.
///
///
///
///
/// The I/O system can be instructed to send I/O completion notification packets to I/O completion ports, where they are queued. The
/// CreateIoCompletionPort function provides this functionality.
///
///
/// An I/O completion port and its handle are associated with the process that created it and is not sharable between processes.
/// However, a single handle is sharable between threads in the same process.
///
/// CreateIoCompletionPort can be used in three distinct modes:
///
/// -
/// Create only an I/O completion port without associating it with a file handle.
///
/// -
/// Associate an existing I/O completion port with a file handle.
///
/// -
/// Perform both creation and association in a single call.
///
///
///
/// To create an I/O completion port without associating it, set the FileHandle parameter to INVALID_HANDLE_VALUE, the
/// ExistingCompletionPort parameter to NULL, and the CompletionKey parameter to zero (which is ignored in this case). Set the
/// NumberOfConcurrentThreads parameter to the desired concurrency value for the new I/O completion port, or zero for the default
/// (the number of processors in the system).
///
///
/// The handle passed in the FileHandle parameter can be any handle that supports overlapped I/O. Most commonly, this is a handle
/// opened by the CreateFile function using the FILE_FLAG_OVERLAPPED flag (for example, files, mail slots, and pipes).
/// Objects created by other functions such as socket can also be associated with an I/O completion port. For an example using
/// sockets, see AcceptEx. A handle can be associated with only one I/O completion port, and after the association is made,
/// the handle remains associated with that I/O completion port until it is closed.
///
/// For more information on I/O completion port theory, usage, and associated functions, see I/O Completion Ports.
///
/// Multiple file handles can be associated with a single I/O completion port by calling CreateIoCompletionPort multiple times
/// with the same I/O completion port handle in the ExistingCompletionPort parameter and a different file handle in the FileHandle
/// parameter each time.
///
///
/// Use the CompletionKey parameter to help your application track which I/O operations have completed. This value is not used by
/// CreateIoCompletionPort for functional control; rather, it is attached to the file handle specified in the FileHandle
/// parameter at the time of association with an I/O completion port. This completion key should be unique for each file handle, and
/// it accompanies the file handle throughout the internal completion queuing process. It is returned in the
/// GetQueuedCompletionStatus function call when a completion packet arrives. The CompletionKey parameter is also used by the
/// PostQueuedCompletionStatus function to queue your own special-purpose completion packets.
///
///
/// After an instance of an open handle is associated with an I/O completion port, it cannot be used in the ReadFileEx or
/// WriteFileEx function because these functions have their own asynchronous I/O mechanisms.
///
///
/// It is best not to share a file handle associated with an I/O completion port by using either handle inheritance or a call to the
/// DuplicateHandle function. Operations performed with such duplicate handles generate completion notifications. Careful
/// consideration is advised.
///
///
/// The I/O completion port handle and every file handle associated with that particular I/O completion port are known as references
/// to the I/O completion port. The I/O completion port is released when there are no more references to it. Therefore, all of these
/// handles must be properly closed to release the I/O completion port and its associated system resources. After these conditions
/// are satisfied, close the I/O completion port handle by calling the CloseHandle function.
///
/// In Windows 8 and Windows Server 2012, this function is supported by the following technologies.
///
///
/// Technology
/// Supported
///
/// -
/// Server Message Block (SMB) 3.0 protocol
/// Yes
///
/// -
/// SMB 3.0 Transparent Failover (TFO)
/// Yes
///
/// -
/// SMB 3.0 with Scale-out File Shares (SO)
/// Yes
///
/// -
/// Cluster Shared Volume File System (CsvFS)
/// Yes
///
/// -
/// Resilient File System (ReFS)
/// Yes
///
///
///
// https://docs.microsoft.com/en-us/windows/desktop/FileIO/createiocompletionport
// HANDLE WINAPI CreateIoCompletionPort( _In_ HANDLE FileHandle, _In_opt_ HANDLE ExistingCompletionPort, _In_ ULONG_PTR CompletionKey, _In_ DWORD NumberOfConcurrentThreads );
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "40cb47fc-7b15-47f6-bee2-2611d4686053")]
public static extern HANDLE CreateIoCompletionPort([In] HANDLE FileHandle, [In, Optional] HANDLE ExistingCompletionPort,
IntPtr CompletionKey, uint NumberOfConcurrentThreads);
/// This macro is used to create a unique system I/O control code (IOCTL).
///
/// Defines the type of device for the given IOCTL. This parameter can be no bigger then a WORD value. The values used by Microsoft
/// are in the range 0-32767 and the values 32768-65535 are reserved for use by OEMs and IHVs.
///
///
/// Defines an action within the device category. That function codes 0-2047 are reserved for Microsoft, and 2048-4095 are reserved
/// for OEMs and IHVs. The function code can be no larger then 4095.
///
///
/// Defines the method codes for how buffers are passed for I/O and file system controls. The following list shows the possible
/// values for this parameter:
///
/// -
/// METHOD_BUFFERED
///
/// -
/// METHOD_IN_DIRECT
///
/// -
/// METHOD_OUT_DIRECT
///
/// -
/// METHOD_NEITHER
///
///
///
/// This field is ignored under Windows CE and you should always use the METHOD_BUFFERED value unless compatibility with the desktop
/// is required using a different Method value.
///
///
///
/// Defines the access check value for any access. The following table shows the possible flags for this parameter. The
/// FILE_ACCESS_ANY is generally the correct value.
///
///
/// Flag
/// Description
///
/// -
/// FILE_ANY_ACCESS
/// Request all access.
///
/// -
/// FILE_READ_ACCESS
/// Request read access. Can be used with FILE_WRITE_ACCESS.
///
/// -
/// FILE_WRITE_ACCESS
/// Request write access. Can be used with FILE_READ_ACCESS.
///
///
///
/// The resulting I/O control code.
/// function
public static uint CTL_CODE(ushort deviceType, ushort function, byte method, byte access)
{
if (function > 0xfff)
throw new ArgumentOutOfRangeException(nameof(function));
return (uint)((deviceType << 0x10) | (access << 14) | (function << 2) | method);
}
/// This macro is used to create a unique system I/O control code (IOCTL).
///
/// Defines the type of device for the given IOCTL. This parameter can be no bigger then a WORD value. The values used by Microsoft
/// are in the range 0-32767 and the values 32768-65535 are reserved for use by OEMs and IHVs.
///
///
/// Defines an action within the device category. That function codes 0-2047 are reserved for Microsoft, and 2048-4095 are reserved
/// for OEMs and IHVs. The function code can be no larger then 4095.
///
///
/// Defines the method codes for how buffers are passed for I/O and file system controls.
///
/// This field is ignored under Windows CE and you should always use the METHOD_BUFFERED value unless compatibility with the desktop
/// is required using a different Method value.
///
///
/// Defines the access check value for any access.
/// The resulting I/O control code.
public static uint CTL_CODE(DEVICE_TYPE deviceType, ushort function, IOMethod method, IOAccess access) =>
CTL_CODE((ushort)deviceType, function, (byte)method, (byte)access);
///
/// Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.
///
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
///
/// A pointer to the input buffer that contains the data required to perform the operation. The format of this data depends on the
/// value of the dwIoControlCode parameter.
/// This parameter can be NULL if dwIoControlCode specifies an operation that does not require input data.
///
/// The size of the input buffer, in bytes.
///
/// A pointer to the output buffer that is to receive the data returned by the operation. The format of this data depends on the
/// value of the dwIoControlCode parameter.
/// This parameter can be NULL if dwIoControlCode specifies an operation that does not return data.
///
/// The size of the output buffer, in bytes.
///
/// A pointer to a variable that receives the size of the data stored in the output buffer, in bytes.
///
/// If the output buffer is too small to receive any data, the call fails, GetLastError returns ERROR_INSUFFICIENT_BUFFER, and
/// lpBytesReturned is zero.
///
///
/// If the output buffer is too small to hold all of the data but can hold some entries, some drivers will return as much data as
/// fits. In this case, the call fails, GetLastError returns ERROR_MORE_DATA, and lpBytesReturned indicates the amount of data
/// received. Your application should call DeviceIoControl again with the same operation, specifying a new starting point.
///
///
/// If lpOverlapped is NULL, lpBytesReturned cannot be NULL. Even when an operation returns no output data and lpOutBuffer is NULL,
/// DeviceIoControl makes use of lpBytesReturned. After such an operation, the value of lpBytesReturned is meaningless.
///
///
/// If lpOverlapped is not NULL, lpBytesReturned can be NULL. If this parameter is not NULL and the operation returns data,
/// lpBytesReturned is meaningless until the overlapped operation has completed. To retrieve the number of bytes returned, call
/// GetOverlappedResult. If hDevice is associated with an I/O completion port, you can retrieve the number of bytes returned by
/// calling GetQueuedCompletionStatus.
///
///
///
/// A pointer to an OVERLAPPED structure.
/// If hDevice was opened without specifying FILE_FLAG_OVERLAPPED, lpOverlapped is ignored.
///
/// If hDevice was opened with the FILE_FLAG_OVERLAPPED flag, the operation is performed as an overlapped (asynchronous) operation.
/// In this case, lpOverlapped must point to a valid OVERLAPPED structure that contains a handle to an event object. Otherwise, the
/// function fails in unpredictable ways.
///
///
/// For overlapped operations, DeviceIoControl returns immediately, and the event object is signaled when the operation has been
/// completed. Otherwise, the function does not return until the operation has been completed or an error occurs.
///
///
///
/// If the operation completes successfully, the return value is nonzero.
/// If the operation fails or is pending, the return value is zero. To get extended error information, call GetLastError.
///
///
///
/// To retrieve a handle to the device, you must call the CreateFile function with either the name of a device or the name of the
/// driver associated with a device. To specify a device name, use the following format:
///
/// \\.\DeviceName
///
/// DeviceIoControl can accept a handle to a specific device. For example, to open a handle to the logical drive
/// A: with CreateFile, specify \\.\a:. Alternatively, you can use the names \\.\PhysicalDrive0, \\.\PhysicalDrive1, and so on, to
/// open handles to the physical drives on a system.
///
///
/// You should specify the FILE_SHARE_READ and FILE_SHARE_WRITE access flags when calling CreateFile to open a handle to a device
/// driver. However, when you open a communications resource, such as a serial port, you must specify exclusive access. Use the other
/// CreateFile parameters as follows when opening a device handle:
///
///
/// -
/// The fdwCreate parameter must specify OPEN_EXISTING.
///
/// -
/// The hTemplateFile parameter must be NULL.
///
/// -
///
/// The fdwAttrsAndFlags parameter can specify FILE_FLAG_OVERLAPPED to indicate that the returned handle can be used in overlapped
/// (asynchronous) I/O operations.
///
///
///
///
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[return: MarshalAs(UnmanagedType.Bool)]
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static extern bool DeviceIoControl(HFILE hDevice, uint dwIoControlCode, [In, Optional] IntPtr lpInBuffer,
[In, Optional] uint nInBufferSize, [Out, Optional] IntPtr lpOutBuffer, [In, Optional] uint nOutBufferSize,
out uint lpBytesReturned, [In, Out, Optional] IntPtr lpOverlapped);
///
/// Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.
///
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
///
/// A pointer to the input buffer that contains the data required to perform the operation. The format of this data depends on the
/// value of the dwIoControlCode parameter.
/// This parameter can be NULL if dwIoControlCode specifies an operation that does not require input data.
///
/// The size of the input buffer, in bytes.
///
/// A pointer to the output buffer that is to receive the data returned by the operation. The format of this data depends on the
/// value of the dwIoControlCode parameter.
/// This parameter can be NULL if dwIoControlCode specifies an operation that does not return data.
///
/// The size of the output buffer, in bytes.
///
/// A pointer to a variable that receives the size of the data stored in the output buffer, in bytes.
///
/// If the output buffer is too small to receive any data, the call fails, GetLastError returns ERROR_INSUFFICIENT_BUFFER, and
/// lpBytesReturned is zero.
///
///
/// If the output buffer is too small to hold all of the data but can hold some entries, some drivers will return as much data as
/// fits. In this case, the call fails, GetLastError returns ERROR_MORE_DATA, and lpBytesReturned indicates the amount of data
/// received. Your application should call DeviceIoControl again with the same operation, specifying a new starting point.
///
///
/// If lpOverlapped is NULL, lpBytesReturned cannot be NULL. Even when an operation returns no output data and lpOutBuffer is NULL,
/// DeviceIoControl makes use of lpBytesReturned. After such an operation, the value of lpBytesReturned is meaningless.
///
///
/// If lpOverlapped is not NULL, lpBytesReturned can be NULL. If this parameter is not NULL and the operation returns data,
/// lpBytesReturned is meaningless until the overlapped operation has completed. To retrieve the number of bytes returned, call
/// GetOverlappedResult. If hDevice is associated with an I/O completion port, you can retrieve the number of bytes returned by
/// calling GetQueuedCompletionStatus.
///
///
///
/// A pointer to an OVERLAPPED structure.
/// If hDevice was opened without specifying FILE_FLAG_OVERLAPPED, lpOverlapped is ignored.
///
/// If hDevice was opened with the FILE_FLAG_OVERLAPPED flag, the operation is performed as an overlapped (asynchronous) operation.
/// In this case, lpOverlapped must point to a valid OVERLAPPED structure that contains a handle to an event object. Otherwise, the
/// function fails in unpredictable ways.
///
///
/// For overlapped operations, DeviceIoControl returns immediately, and the event object is signaled when the operation has been
/// completed. Otherwise, the function does not return until the operation has been completed or an error occurs.
///
///
///
/// If the operation completes successfully, the return value is nonzero.
/// If the operation fails or is pending, the return value is zero. To get extended error information, call GetLastError.
///
///
///
/// To retrieve a handle to the device, you must call the CreateFile function with either the name of a device or the name of the
/// driver associated with a device. To specify a device name, use the following format:
///
/// \\.\DeviceName
///
/// DeviceIoControl can accept a handle to a specific device. For example, to open a handle to the logical drive
/// A: with CreateFile, specify \\.\a:. Alternatively, you can use the names \\.\PhysicalDrive0, \\.\PhysicalDrive1, and so on, to
/// open handles to the physical drives on a system.
///
///
/// You should specify the FILE_SHARE_READ and FILE_SHARE_WRITE access flags when calling CreateFile to open a handle to a device
/// driver. However, when you open a communications resource, such as a serial port, you must specify exclusive access. Use the other
/// CreateFile parameters as follows when opening a device handle:
///
///
/// -
/// The fdwCreate parameter must specify OPEN_EXISTING.
///
/// -
/// The hTemplateFile parameter must be NULL.
///
/// -
///
/// The fdwAttrsAndFlags parameter can specify FILE_FLAG_OVERLAPPED to indicate that the returned handle can be used in overlapped
/// (asynchronous) I/O operations.
///
///
///
///
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[return: MarshalAs(UnmanagedType.Bool)]
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static extern unsafe bool DeviceIoControl(HFILE hDevice, uint dwIoControlCode, [In, Optional] byte* lpInBuffer,
[In, Optional] uint nInBufferSize, [Out, Optional] byte* lpOutBuffer, [In, Optional] uint nOutBufferSize,
out uint lpBytesReturned, [In, Out, Optional] NativeOverlapped* lpOverlapped);
///
/// Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.
///
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
/// true if successful.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static bool DeviceIoControl(HFILE hDev, uint ioControlCode) =>
DeviceIoControl(hDev, ioControlCode, IntPtr.Zero, 0, IntPtr.Zero, 0, out _, IntPtr.Zero);
///
/// Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.
///
/// The type of the .
/// The type of the .
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
///
/// The data required to perform the operation. The format of this data depends on the value of the dwIoControlCode parameter.
///
///
/// The data returned by the operation. The format of this data depends on the value of the dwIoControlCode parameter.
///
/// true if successful.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static bool DeviceIoControl(HFILE hDev, uint ioControlCode, TIn inVal, out TOut outVal) where TIn : struct where TOut : struct
{
using SafeHGlobalHandle ptrIn = SafeHGlobalHandle.CreateFromStructure(inVal), ptrOut = SafeHGlobalHandle.CreateFromStructure();
var ret = DeviceIoControl(hDev, ioControlCode, ptrIn, ptrIn.Size, ptrOut, ptrOut.Size, out var bRet, IntPtr.Zero);
if (!ret && Win32Error.GetLastError() == Win32Error.ERROR_INSUFFICIENT_BUFFER)
{
ptrOut.Size = bRet;
ret = DeviceIoControl(hDev, ioControlCode, IntPtr.Zero, 0, ptrOut, ptrOut.Size, out bRet, IntPtr.Zero);
}
outVal = ret ? ptrOut.ToStructure() : default;
return ret;
}
///
/// Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.
///
/// The type of the .
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
///
/// The data returned by the operation. The format of this data depends on the value of the dwIoControlCode parameter.
///
/// true if successful.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static bool DeviceIoControl(HFILE hDev, uint ioControlCode, out TOut outVal) where TOut : struct
{
using var ptrOut = SafeHGlobalHandle.CreateFromStructure();
var ret = DeviceIoControl(hDev, ioControlCode, IntPtr.Zero, 0, ptrOut, ptrOut.Size, out var bRet, IntPtr.Zero);
if (!ret && Win32Error.GetLastError() == Win32Error.ERROR_INSUFFICIENT_BUFFER)
{
ptrOut.Size = bRet;
ret = DeviceIoControl(hDev, ioControlCode, IntPtr.Zero, 0, ptrOut, ptrOut.Size, out bRet, IntPtr.Zero);
}
outVal = ret ? ptrOut.ToStructure() : default;
return ret;
}
///
/// Sends a control code directly to a specified device driver, causing the corresponding device to perform the corresponding operation.
///
/// The type of the .
///
/// A handle to the device on which the operation is to be performed. The device is typically a volume, directory, file, or stream.
/// To retrieve a device handle, use the CreateFile function. For more information, see Remarks.
///
///
/// The control code for the operation. This value identifies the specific operation to be performed and the type of device on which
/// to perform it.
///
///
/// The data required to perform the operation. The format of this data depends on the value of the dwIoControlCode parameter.
///
/// true if successful.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static bool DeviceIoControl(HFILE hDev, uint ioControlCode, TIn inVal) where TIn : struct
{
using var ptrIn = SafeHGlobalHandle.CreateFromStructure(inVal);
return DeviceIoControl(hDev, ioControlCode, ptrIn, ptrIn.Size, IntPtr.Zero, 0, out _, IntPtr.Zero);
}
/// Ends the asynchronous call to BeginDeviceIoControl<TIn, TOut>(HFILE, uint, TIn?, TOut?, AsyncCallback).
/// The type of the input value.
/// The type of the output value.
/// The asynchronous result returned from BeginDeviceIoControl>TIn, TOut<(HFILE, uint, TIn?, TOut?, AsyncCallback).
/// The output value, if exists; null otherwise.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static TOut? EndDeviceIoControl(IAsyncResult asyncResult) where TIn : struct where TOut : struct
{
var ret = OverlappedAsync.EndOverlappedFunction(asyncResult);
return Unpack(ret as byte[]).Item2;
}
/// Ends the asynchronous call to BeginDeviceIoControl<TIn, TOut>(HFILE, uint, TIn?, TOut?, AsyncCallback).
///
/// The asynchronous result returned from BeginDeviceIoControl<TIn, TOut>(HFILE, uint, TIn?, TOut?, AsyncCallback).
///
/// The output buffer, if exists; null otherwise.
[PInvokeData("Winbase.h", MSDNShortId = "aa363216")]
public static byte[] EndDeviceIoControl(IAsyncResult asyncResult)
{
var ret = OverlappedAsync.EndOverlappedFunction(asyncResult);
return Unpack(ret as byte[]).Item2;
}
///
/// Retrieves the results of an overlapped operation on the specified file, named pipe, or communications device. To specify a
/// timeout interval or wait on an alertable thread, use GetOverlappedResultEx.
///
///
/// A handle to the file, named pipe, or communications device. This is the same handle that was specified when the overlapped
/// operation was started by a call to the ReadFile, WriteFile, ConnectNamedPipe, TransactNamedPipe,
/// DeviceIoControl, or WaitCommEvent function.
///
///
/// A pointer to an OVERLAPPED structure that was specified when the overlapped operation was started.
///
///
/// A pointer to a variable that receives the number of bytes that were actually transferred by a read or write operation. For a
/// TransactNamedPipe operation, this is the number of bytes that were read from the pipe. For a DeviceIoControl
/// operation, this is the number of bytes of output data returned by the device driver. For a ConnectNamedPipe or
/// WaitCommEvent operation, this value is undefined.
///
///
/// If this parameter is TRUE, and the Internal member of the lpOverlapped structure is STATUS_PENDING, the
/// function does not return until the operation has been completed. If this parameter is FALSE and the operation is still
/// pending, the function returns FALSE and the GetLastError function returns ERROR_IO_INCOMPLETE.
///
///
/// If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. To get extended error information, call GetLastError.
///
// BOOL WINAPI GetOverlappedResult( _In_ HANDLE hFile, _In_ LPOVERLAPPED lpOverlapped, _Out_ LPDWORD lpNumberOfBytesTransferred, _In_
// BOOL bWait); https://msdn.microsoft.com/en-us/library/windows/desktop/ms683209(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("WinBase.h", MSDNShortId = "ms683209")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool GetOverlappedResult([In] HFILE hFile, [In] NativeOverlapped* lpOverlapped, out uint lpNumberOfBytesTransferred, [MarshalAs(UnmanagedType.Bool)] bool bWait);
///
/// Retrieves the results of an overlapped operation on the specified file, named pipe, or communications device within the specified
/// time-out interval. The calling thread can perform an alertable wait.
///
///
/// A handle to the file, named pipe, or communications device. This is the same handle that was specified when the overlapped
/// operation was started by a call to the ReadFile, WriteFile, ConnectNamedPipe, TransactNamedPipe,
/// DeviceIoControl, or WaitCommEvent function.
///
///
/// A pointer to an OVERLAPPED structure that was specified when the overlapped operation was started.
///
///
/// A pointer to a variable that receives the number of bytes that were actually transferred by a read or write operation. For a
/// TransactNamedPipe operation, this is the number of bytes that were read from the pipe. For a DeviceIoControl
/// operation, this is the number of bytes of output data returned by the device driver. For a ConnectNamedPipe or
/// WaitCommEvent operation, this value is undefined.
///
///
/// The time-out interval, in milliseconds.
///
/// If dwMilliseconds is zero and the operation is still in progress, the function returns immediately and the GetLastError
/// function returns ERROR_IO_INCOMPLETE.
///
///
/// If dwMilliseconds is nonzero and the operation is still in progress, the function waits until the object is signaled, an I/O
/// completion routine or APC is queued, or the interval elapses before returning. Use GetLastError to get extended error information.
///
///
/// If dwMilliseconds is INFINITE, the function returns only when the object is signaled or an I/O completion routine or APC
/// is queued.
///
///
///
///
/// If this parameter is TRUE and the calling thread is in the waiting state, the function returns when the system queues an
/// I/O completion routine or APC. The calling thread then runs the routine or function. Otherwise, the function does not return, and
/// the completion routine or APC function is not executed.
///
///
/// A completion routine is queued when the ReadFileEx or WriteFileEx function in which it was specified has completed.
/// The function returns and the completion routine is called only if bAlertable is TRUE, and the calling thread is the thread
/// that initiated the read or write operation. An APC is queued when you call QueueUserAPC.
///
///
///
/// If the function succeeds, the return value is nonzero.
///
/// If the function fails, the return value is zero. To get extended error information, call GetLastError. Common error codes
/// include the following:
///
///
// WINBASEAPI BOOL WINAPI GetOverlappedResultEx( _In_ HANDLE hFile, _In_ LPOVERLAPPED lpOverlapped, _Out_ LPDWORD
// lpNumberOfBytesTransferred, _In_ DWORD dwMilliseconds, _In_ BOOL bAlertable); https://msdn.microsoft.com/en-us/library/windows/desktop/hh448542(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("Ioapiset.h", MSDNShortId = "hh448542")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool GetOverlappedResultEx([In] HFILE hFile, [In] NativeOverlapped* lpOverlapped, out uint lpNumberOfBytesTransferred, uint dwMilliseconds, [MarshalAs(UnmanagedType.Bool)] bool bAlertable);
///
///
/// Attempts to dequeue an I/O completion packet from the specified I/O completion port. If there is no completion packet queued, the
/// function waits for a pending I/O operation associated with the completion port to complete.
///
/// To dequeue multiple I/O completion packets at once, use the GetQueuedCompletionStatusEx function.
///
///
/// A handle to the completion port. To create a completion port, use the CreateIoCompletionPort function.
///
///
/// A pointer to a variable that receives the number of bytes transferred during an I/O operation that has completed.
///
///
/// A pointer to a variable that receives the completion key value associated with the file handle whose I/O operation has completed.
/// A completion key is a per-file key that is specified in a call to CreateIoCompletionPort.
///
///
///
/// A pointer to a variable that receives the address of the OVERLAPPED structure that was specified when the completed I/O
/// operation was started.
///
///
/// Even if you have passed the function a file handle associated with a completion port and a valid OVERLAPPED structure, an
/// application can prevent completion port notification. This is done by specifying a valid event handle for the hEvent
/// member of the OVERLAPPED structure, and setting its low-order bit. A valid event handle whose low-order bit is set keeps
/// I/O completion from being queued to the completion port.
///
///
///
///
/// The number of milliseconds that the caller is willing to wait for a completion packet to appear at the completion port. If a
/// completion packet does not appear within the specified time, the function times out, returns FALSE, and sets *lpOverlapped
/// to NULL.
///
///
/// If dwMilliseconds is INFINITE, the function will never time out. If dwMilliseconds is zero and there is no I/O operation
/// to dequeue, the function will time out immediately.
///
///
///
/// Returns nonzero ( TRUE) if successful or zero ( FALSE) otherwise.
/// To get extended error information, call GetLastError.
/// For more information, see the Remarks section.
///
// BOOL WINAPI GetQueuedCompletionStatus( _In_ HANDLE CompletionPort, _Out_ LPDWORD lpNumberOfBytes, _Out_ PULONG_PTR
// lpCompletionKey, _Out_ LPOVERLAPPED
// *lpOverlapped, _In_ DWORD dwMilliseconds); https://msdn.microsoft.com/en-us/library/windows/desktop/aa364986(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("WinBase.h", MSDNShortId = "aa364986")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool GetQueuedCompletionStatus([In] HANDLE CompletionPort, out uint lpNumberOfBytes, out IntPtr lpCompletionKey, NativeOverlapped** lpOverlapped, uint dwMilliseconds);
///
///
/// Attempts to dequeue an I/O completion packet from the specified I/O completion port. If there is no completion packet queued, the
/// function waits for a pending I/O operation associated with the completion port to complete.
///
/// To dequeue multiple I/O completion packets at once, use the GetQueuedCompletionStatusEx function.
///
///
/// A handle to the completion port. To create a completion port, use the CreateIoCompletionPort function.
///
///
/// A pointer to a variable that receives the number of bytes transferred during an I/O operation that has completed.
///
///
/// A pointer to a variable that receives the completion key value associated with the file handle whose I/O operation has completed.
/// A completion key is a per-file key that is specified in a call to CreateIoCompletionPort.
///
///
///
/// A pointer to a variable that receives the address of the OVERLAPPED structure that was specified when the completed I/O
/// operation was started.
///
///
/// Even if you have passed the function a file handle associated with a completion port and a valid OVERLAPPED structure, an
/// application can prevent completion port notification. This is done by specifying a valid event handle for the hEvent
/// member of the OVERLAPPED structure, and setting its low-order bit. A valid event handle whose low-order bit is set keeps
/// I/O completion from being queued to the completion port.
///
///
///
///
/// The number of milliseconds that the caller is willing to wait for a completion packet to appear at the completion port. If a
/// completion packet does not appear within the specified time, the function times out, returns FALSE, and sets *lpOverlapped
/// to NULL.
///
///
/// If dwMilliseconds is INFINITE, the function will never time out. If dwMilliseconds is zero and there is no I/O operation
/// to dequeue, the function will time out immediately.
///
///
///
/// Returns nonzero ( TRUE) if successful or zero ( FALSE) otherwise.
/// To get extended error information, call GetLastError.
/// For more information, see the Remarks section.
///
// BOOL WINAPI GetQueuedCompletionStatus( _In_ HANDLE CompletionPort, _Out_ LPDWORD lpNumberOfBytes, _Out_ PULONG_PTR
// lpCompletionKey, _Out_ LPOVERLAPPED
// *lpOverlapped, _In_ DWORD dwMilliseconds); https://msdn.microsoft.com/en-us/library/windows/desktop/aa364986(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("WinBase.h", MSDNShortId = "aa364986")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetQueuedCompletionStatus([In] HANDLE CompletionPort, out uint lpNumberOfBytes, out IntPtr lpCompletionKey, out IntPtr lpOverlapped, uint dwMilliseconds);
///
///
/// Retrieves multiple completion port entries simultaneously. It waits for pending I/O operations that are associated with the
/// specified completion port to complete.
///
/// To dequeue I/O completion packets one at a time, use the GetQueuedCompletionStatus function.
///
///
/// A handle to the completion port. To create a completion port, use the CreateIoCompletionPort function.
///
///
/// On input, points to a pre-allocated array of OVERLAPPED_ENTRY structures.
///
/// On output, receives an array of OVERLAPPED_ENTRY structures that hold the entries. The number of array elements is
/// provided by ulNumEntriesRemoved.
///
///
/// The number of bytes transferred during each I/O, the completion key that indicates on which file each I/O occurred, and the
/// overlapped structure address used in each original I/O are all returned in the lpCompletionPortEntries array.
///
///
/// The maximum number of entries to remove.
/// A pointer to a variable that receives the number of entries actually removed.
///
///
/// The number of milliseconds that the caller is willing to wait for a completion packet to appear at the completion port. If a
/// completion packet does not appear within the specified time, the function times out and returns FALSE.
///
///
/// If dwMilliseconds is INFINITE (0xFFFFFFFF), the function will never time out. If dwMilliseconds is zero and there is no
/// I/O operation to dequeue, the function will time out immediately.
///
///
///
/// If this parameter is FALSE, the function does not return until the time-out period has elapsed or an entry is retrieved.
///
/// If the parameter is TRUE and there are no available entries, the function performs an alertable wait. The thread returns
/// when the system queues an I/O completion routine or APC to the thread and the thread executes the function.
///
///
/// A completion routine is queued when the ReadFileEx or WriteFileEx function in which it was specified has completed,
/// and the calling thread is the thread that initiated the operation. An APC is queued when you call QueueUserAPC.
///
///
// BOOL WINAPI GetQueuedCompletionStatusEx( _In_ HANDLE CompletionPort, _Out_ LPOVERLAPPED_ENTRY lpCompletionPortEntries, _In_ ULONG
// ulCount, _Out_ PULONG ulNumEntriesRemoved, _In_ DWORD dwMilliseconds, _In_ BOOL fAlertable); https://msdn.microsoft.com/en-us/library/windows/desktop/aa364988(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "aa364988")]
public static extern void GetQueuedCompletionStatusEx(HANDLE CompletionPort, OVERLAPPED_ENTRY[] lpCompletionPortEntries, uint ulCount, out uint ulNumEntriesRemoved, uint dwMilliseconds, [MarshalAs(UnmanagedType.Bool)] bool fAlertable);
/// Posts an I/O completion packet to an I/O completion port.
/// A handle to an I/O completion port to which the I/O completion packet is to be posted.
///
/// The value to be returned through the lpNumberOfBytesTransferred parameter of the GetQueuedCompletionStatus function.
///
///
/// The value to be returned through the lpCompletionKey parameter of the GetQueuedCompletionStatus function.
///
///
/// The value to be returned through the lpOverlapped parameter of the GetQueuedCompletionStatus function.
///
///
/// If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. To get extended error information, call GetLastError .
///
// BOOL WINAPI PostQueuedCompletionStatus( _In_ HANDLE CompletionPort, _In_ DWORD dwNumberOfBytesTransferred, _In_ ULONG_PTR
// dwCompletionKey, _In_opt_ LPOVERLAPPED lpOverlapped); https://msdn.microsoft.com/en-us/library/windows/desktop/aa365458(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "aa365458")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern unsafe bool PostQueuedCompletionStatus([In] HANDLE CompletionPort, uint dwNumberOfBytesTransferred,
IntPtr dwCompletionKey, [In, Optional] NativeOverlapped* lpOverlapped);
/// Posts an I/O completion packet to an I/O completion port.
/// A handle to an I/O completion port to which the I/O completion packet is to be posted.
///
/// The value to be returned through the lpNumberOfBytesTransferred parameter of the GetQueuedCompletionStatus function.
///
///
/// The value to be returned through the lpCompletionKey parameter of the GetQueuedCompletionStatus function.
///
///
/// The value to be returned through the lpOverlapped parameter of the GetQueuedCompletionStatus function.
///
///
/// If the function succeeds, the return value is nonzero.
/// If the function fails, the return value is zero. To get extended error information, call GetLastError .
///
// BOOL WINAPI PostQueuedCompletionStatus( _In_ HANDLE CompletionPort, _In_ DWORD dwNumberOfBytesTransferred, _In_ ULONG_PTR
// dwCompletionKey, _In_opt_ LPOVERLAPPED lpOverlapped); https://msdn.microsoft.com/en-us/library/windows/desktop/aa365458(v=vs.85).aspx
[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
[PInvokeData("IoAPI.h", MSDNShortId = "aa365458")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool PostQueuedCompletionStatus([In] HANDLE CompletionPort, uint dwNumberOfBytesTransferred,
[In, Optional] IntPtr dwCompletionKey, [In, Optional] IntPtr lpOverlapped);
private static unsafe IAsyncResult BeginDeviceIoControl(HFILE hDevice, uint dwIoControlCode, byte[] buffer, AsyncCallback userCallback, object userState) where TIn : struct where TOut : struct =>
BeginDeviceIoControl(hDevice, dwIoControlCode, buffer, userCallback, userState);
private static unsafe IAsyncResult BeginDeviceIoControl(HFILE hDevice, uint dwIoControlCode, byte[] buffer, AsyncCallback userCallback, object userState)
{
var ar = OverlappedAsync.SetupOverlappedFunction(hDevice, userCallback, buffer);
var intSz = Marshal.SizeOf(typeof(int));
var inSz = BitConverter.ToInt32(buffer, 0);
var outSz = BitConverter.ToInt32(buffer, intSz);
fixed (byte* pIn = &buffer[intSz * 2], pOut = &buffer[outSz == 0 ? 0 : intSz * 2 + inSz])
{
var ret = DeviceIoControl(hDevice, dwIoControlCode, pIn, (uint)inSz, pOut, (uint)outSz, out var bRet, ar.Overlapped);
return OverlappedAsync.EvaluateOverlappedFunction(ar, ret);
}
}
private static T MemRead(byte[] buffer, ref int startIndex) where T : struct
{
using var pin = new PinnedObject(buffer, startIndex);
startIndex += Marshal.SizeOf(typeof(T));
return ((IntPtr)pin).ToStructure();
}
private static int MemWrite(byte[] buffer, T value, int startIndex = 0) where T : struct
{
var sz = Marshal.SizeOf(typeof(T));
using (var pin = new PinnedObject(value))
Marshal.Copy(pin, buffer, startIndex, sz);
return sz;
}
private static byte[] Pack(TIn? inVal, TOut? outVal) where TIn : struct where TOut : struct
{
using var ms = new MemoryStream();
using var wtr = new BinaryWriter(ms);
wtr.Write(inVal.HasValue ? Marshal.SizeOf(typeof(TIn)) : 0);
wtr.Write(outVal.HasValue ? Marshal.SizeOf(typeof(TOut)) : 0);
if (inVal.HasValue) wtr.Write(inVal.Value);
if (outVal.HasValue) wtr.Write(outVal.Value);
return ms.ToArray();
}
private static byte[] Pack(byte[] inputBuffer, byte[] outputBuffer)
{
using var ms = new MemoryStream();
using var wtr = new BinaryWriter(ms);
wtr.Write(inputBuffer != null ? inputBuffer.Length : 0);
wtr.Write(outputBuffer != null ? outputBuffer.Length : 0);
if (inputBuffer != null && inputBuffer.Length > 0)
wtr.Write(inputBuffer);
if (outputBuffer != null && outputBuffer.Length > 0)
wtr.Write(outputBuffer);
return ms.ToArray();
}
private static Tuple Unpack(byte[] buffer) where TIn : struct where TOut : struct
{
using var ms = new MemoryStream(buffer);
using var rdr = new BinaryReader(ms);
var inLen = rdr.ReadInt32();
var outLen = rdr.ReadInt32();
return new Tuple(inLen > 0 ? rdr.Read() : (TIn?)null, outLen > 0 ? rdr.Read() : (TOut?)null);
}
private static Tuple Unpack(byte[] buffer)
{
using var ms = new MemoryStream(buffer);
using var rdr = new BinaryReader(ms);
var inLen = rdr.ReadInt32();
var outLen = rdr.ReadInt32();
return new Tuple(rdr.ReadBytes(inLen), rdr.ReadBytes(outLen));
}
/// Contains the information returned by a call to the GetQueuedCompletionStatusEx function.
// https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-overlapped_entry typedef struct _OVERLAPPED_ENTRY {
// ULONG_PTR lpCompletionKey; LPOVERLAPPED lpOverlapped; ULONG_PTR Internal; DWORD dwNumberOfBytesTransferred; } OVERLAPPED_ENTRY, *LPOVERLAPPED_ENTRY;
[PInvokeData("minwinbase.h", MSDNShortId = "3e244e6c-0731-477a-b1d3-2601c29449ca")]
[StructLayout(LayoutKind.Sequential)]
public struct OVERLAPPED_ENTRY
{
///
/// Receives the completion key value associated with the file handle whose I/O operation has completed. A completion key is a
/// per-file key that is specified in a call to CreateIoCompletionPort.
///
public IntPtr lpCompletionKey;
/// Receives the address of the OVERLAPPED structure that was specified when the completed I/O operation was started.
public IntPtr lpOverlapped;
/// Reserved.
public UIntPtr Internal;
/// Receives the number of bytes transferred during the I/O operation that has completed.
public uint dwNumberOfBytesTransferred;
}
}
}