mirror of https://github.com/dahall/Vanara.git
Changed INVALID_SET_FILE_POINTER a UInt32 to match SetFilePointer output type. Changed unsafe overload of ReadFIle to have all pointer params. Added SetFilePointer overload taking uint values as params.
dahall
parent
c5075f648b
commit
034b6793e6
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@ -28,7 +28,7 @@ namespace Vanara.PInvoke
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[PInvokeData("fileapi.h")] public const uint INVALID_FILE_SIZE = 0xFFFFFFFF;
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/// <summary>A value returned then a file pointer cannot be set.</summary>
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[PInvokeData("fileapi.h")] public const int INVALID_SET_FILE_POINTER = -1;
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[PInvokeData("fileapi.h")] public const uint INVALID_SET_FILE_POINTER = unchecked((uint)-1);
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/// <summary>Alway open, creating new if doesn't exist.</summary>
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[PInvokeData("fileapi.h")] public const uint OPEN_ALWAYS = 4;
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@ -341,7 +341,7 @@ namespace Vanara.PInvoke
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var ar = OverlappedAsync.SetupOverlappedFunction(hFile, requestCallback, stateObject);
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fixed (byte* pIn = buffer)
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{
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var ret = ReadFile(hFile, pIn, numberOfBytesToRead, IntPtr.Zero, ar.Overlapped);
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var ret = ReadFile(hFile, pIn, numberOfBytesToRead, null, ar.Overlapped);
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return OverlappedAsync.EvaluateOverlappedFunction(ar, ret);
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}
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}
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@ -3814,7 +3814,7 @@ namespace Vanara.PInvoke
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[DllImport(Lib.Kernel32, ExactSpelling = true, SetLastError = true)]
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[return: MarshalAs(UnmanagedType.Bool)]
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[PInvokeData("FileAPI.h", MSDNShortId = "aa365467")]
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public static extern unsafe bool ReadFile(HFILE hFile, byte* lpBuffer, uint nNumberOfBytesToRead, IntPtr lpNumberOfBytesRead, NativeOverlapped* lpOverlapped);
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public static extern unsafe bool ReadFile(HFILE hFile, byte* lpBuffer, uint nNumberOfBytesToRead, [Optional] uint* lpNumberOfBytesRead, NativeOverlapped* lpOverlapped);
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/// <summary>
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/// Reads data from the specified file or input/output (I/O) device. Reads occur at the position specified by the file pointer if
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@ -4305,6 +4305,89 @@ namespace Vanara.PInvoke
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[PInvokeData("FileAPI.h", MSDNShortId = "aa365541")]
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public static extern uint SetFilePointer([In] HFILE hFile, int lDistanceToMove, ref int lpDistanceToMoveHigh, SeekOrigin dwMoveMethod);
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/// <summary>
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/// <para>Moves the file pointer of the specified file.</para>
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/// <para>
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/// This function stores the file pointer in two <c>LONG</c> values. To work with file pointers that are larger than a single
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/// <c>LONG</c> value, it is easier to use the <c>SetFilePointerEx</c> function.
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/// </para>
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/// </summary>
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/// <param name="hFile">
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/// <para>A handle to the file.</para>
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/// <para>
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/// The file handle must be created with the <c>GENERIC_READ</c> or <c>GENERIC_WRITE</c> access right. For more information, see File
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/// Security and Access Rights.
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/// </para>
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/// </param>
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/// <param name="lDistanceToMove">
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/// <para>The low order 32-bits of a signed value that specifies the number of bytes to move the file pointer.</para>
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/// <para>
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/// If lpDistanceToMoveHigh is not <c>NULL</c>, lpDistanceToMoveHigh and lDistanceToMove form a single 64-bit signed value that
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/// specifies the distance to move.
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/// </para>
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/// <para>
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/// If lpDistanceToMoveHigh is <c>NULL</c>, lDistanceToMove is a 32-bit signed value. A positive value for lDistanceToMove moves the
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/// file pointer forward in the file, and a negative value moves the file pointer back.
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/// </para>
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/// </param>
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/// <param name="lpDistanceToMoveHigh">
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/// <para>A pointer to the high order 32-bits of the signed 64-bit distance to move.</para>
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/// <para>If you do not need the high order 32-bits, this pointer must be set to <c>NULL</c>.</para>
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/// <para>
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/// When not <c>NULL</c>, this parameter also receives the high order <c>DWORD</c> of the new value of the file pointer. For more
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/// information, see the Remarks section in this topic.
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/// </para>
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/// </param>
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/// <param name="dwMoveMethod">
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/// <para>The starting point for the file pointer move.</para>
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/// <para>This parameter can be one of the following values.</para>
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/// <para>
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/// <list type="table">
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/// <listheader>
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/// <term>Value</term>
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/// <term>Meaning</term>
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/// </listheader>
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/// <item>
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/// <term>FILE_BEGIN = 0</term>
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/// <term>The starting point is zero or the beginning of the file.</term>
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/// </item>
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/// <item>
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/// <term>FILE_CURRENT = 1</term>
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/// <term>The starting point is the current value of the file pointer.</term>
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/// </item>
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/// <item>
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/// <term>FILE_END = 2</term>
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/// <term>The starting point is the current end-of-file position.</term>
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/// </item>
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/// </list>
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/// </para>
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/// </param>
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/// <returns>
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/// <para>
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/// If the function succeeds and lpDistanceToMoveHigh is <c>NULL</c>, the return value is the low-order <c>DWORD</c> of the new file pointer.
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/// </para>
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/// <para>
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/// <c>Note</c> If the function returns a value other than <c>INVALID_SET_FILE_POINTER</c>, the call to <c>SetFilePointer</c> has
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/// succeeded. You do not need to call <c>GetLastError</c>.
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/// </para>
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/// <para>
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/// If function succeeds and lpDistanceToMoveHigh is not <c>NULL</c>, the return value is the low-order <c>DWORD</c> of the new file
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/// pointer and lpDistanceToMoveHigh contains the high order <c>DWORD</c> of the new file pointer.
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/// </para>
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/// <para>If the function fails, the return value is <c>INVALID_SET_FILE_POINTER</c>. To get extended error information, call <c>GetLastError</c>.</para>
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/// <para>
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/// If a new file pointer is a negative value, the function fails, the file pointer is not moved, and the code returned by
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/// <c>GetLastError</c> is <c>ERROR_NEGATIVE_SEEK</c>.
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/// </para>
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/// <para>
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/// If lpDistanceToMoveHigh is <c>NULL</c> and the new file position does not fit in a 32-bit value, the function fails and returns <c>INVALID_SET_FILE_POINTER</c>.
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/// </para>
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/// </returns>
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// DWORD WINAPI SetFilePointer( _In_ HANDLE hFile, _In_ LONG lDistanceToMove, _Inout_opt_ PLONG lpDistanceToMoveHigh, _In_ DWORD dwMoveMethod);
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[DllImport(Lib.Kernel32, SetLastError = true, ExactSpelling = true)]
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[PInvokeData("FileAPI.h", MSDNShortId = "aa365541")]
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public static extern uint SetFilePointer([In] HFILE hFile, uint lDistanceToMove, ref uint lpDistanceToMoveHigh, SeekOrigin dwMoveMethod);
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/// <summary>
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/// <para>Moves the file pointer of the specified file.</para>
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/// </summary>
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