private unsafe IAsyncResult BeginWriteCore(byte[] array, int offset, int count, AsyncCallback userCallback, Object stateObject)
{
Debug.Assert(userCallback == null);
Debug.Assert(stateObject == null);
CheckParametersForBegin(array, offset, count);
AsyncFileStream_AsyncResult asyncResult = new AsyncFileStream_AsyncResult(userCallback, stateObject, true);
if (count == 0)
{
asyncResult.SignalCompleted();
}
else
{
// Keep the array in one location in memory until the OS writes the
// relevant data into the array. Free GCHandle later.
asyncResult.PinBuffer(array);
fixed(byte *p = array)
{
uint numBytesWritten = 0;
bool res;
byte[] byteArray = new byte[count];
Marshal.Copy(new IntPtr(p + offset), byteArray, 0, count);
//res = Native.ReadFile(m_handle.DangerousGetHandle(), p + offset, count, out numBytesRead, asyncResult.OverlappedPtr);
res = WinUsbDevice.WinUsb_WritePipe(
m_winUsbDevice.DeviceInfo.winUsbHandle,
System.Convert.ToByte(m_winUsbDevice.DeviceInfo.bulkOutPipe),
byteArray,
(uint)count,
ref numBytesWritten,
System.IntPtr.Zero);
if (res == false)
{
if (HandleErrorSituation("BeginWrite", true))
{
asyncResult.SignalCompleted();
}
else
{
m_outstandingRequests.Add(asyncResult);
}
}
else
{
asyncResult.m_numBytes = (int)numBytesWritten;
asyncResult.SignalCompleted();
}
}
}
return(asyncResult);
}
