public unsafe void Read(byte[] readBuffer)
{
uint bytesRead = 0;
fixed(byte *outBuffer = readBuffer)
{
var success = false;
try
{
success = InteropKernel32.ReadFile(_readHandle,
outBuffer,
(uint)readBuffer.Length,
ref bytesRead,
null);
}
catch (ObjectDisposedException)
{
throw new Exception("File handle already closed");
}
if (!success)
{
HandleIOError(false);
}
}
}
public unsafe void ReadOverlapped(byte[] readBuffer)
{
var completedEvent = new ManualResetEvent(false);
uint bytesRead = 0;
var inOverlapped = new Overlapped();
inOverlapped.EventHandleIntPtr = completedEvent.SafeWaitHandle.DangerousGetHandle();
NativeOverlapped *inNativeOverlapped = inOverlapped.Pack(null, null);
try
{
// send the data to the device
fixed(byte *outBuffer = readBuffer)
{
var success = false;
try
{
success = InteropKernel32.ReadFile(_readHandle,
outBuffer,
(uint)readBuffer.Length,
ref bytesRead,
inNativeOverlapped);
}
catch (ObjectDisposedException)
{
throw new Exception("File handle already closed");
}
if (!success)
{
HandleIOError(true);
CancelOverlapped(_readHandle, completedEvent);
}
}
}
finally
{
// clean up
Overlapped.Free(inNativeOverlapped);
}
}