sean-m
/
Vanara
mirror of https://github.com/dahall/Vanara.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Added SetupOverlappedFunction that uses a FileStream and doesn't try to rebind to the handle

pull/60/head v2.3.11
David Hall 2019-06-09 10:01:19 -06:00
parent 322ac346df
commit 7b712e2215
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
PInvoke/Shared/OverlappedAsyncBase.cs
View File

@ -85,6 +85,28 @@ namespace Vanara.PInvoke
return ar;
}
/// <summary>Setups the class that holds the overlapped call details. Use at the start of the 'Begin' method.</summary>
/// <param name="fileStream">The file to bind to.</param>
/// <param name="userCallback">The user callback method.</param>
/// <param name="userState">
/// A variable that is passed to all receiving methods in the asynchronous methods. Can be use to hold any user defined object.
/// </param>
/// <returns>An <see cref="OverlappedAsyncResult"/> instance for the asynchronous calls.</returns>
public static unsafe OverlappedAsyncResult SetupOverlappedFunction(System.IO.FileStream fileStream, AsyncCallback userCallback, object userState)
{
var ar = new OverlappedAsyncResult(userState, userCallback, fileStream.SafeFileHandle.DangerousGetHandle());
var o = new Overlapped(0, 0, IntPtr.Zero, ar);
ar.Overlapped = o.Pack((code, bytes, pOverlapped) =>
{
var asyncResult = (OverlappedAsyncResult)Overlapped.Unpack(pOverlapped).AsyncResult;
if (asyncResult.IsCompleted) return;
asyncResult.FreeOverlapped();
if (code == 0x217) code = 0;
asyncResult.Complete(true, (int)code);
}, userState);
return ar;
}
private static void BindHandle(HFILE hDevice)
{
if (boundHandles.Add(hDevice))