public unsafe void ReadControl(uint controlCode, byte[] writeBuffer, byte[] readBuffer)
{
uint bytesReturned = 0;
fixed(byte *inBuffer = writeBuffer)
{
fixed(byte *outBuffer = readBuffer)
{
var success = false;
try
{
success = InteropKernel32.DeviceIoControl(_readHandle,
controlCode,
inBuffer,
writeBuffer == null ? 0 : (uint)writeBuffer.Length,
outBuffer,
readBuffer == null ? 0 : (uint)readBuffer.Length,
ref bytesReturned,
null);
}
catch (ObjectDisposedException)
{
throw new Exception("File handle already closed");
}
if (!success)
{
HandleIOError(false);
}
}
}
}
public unsafe void WriteControl(uint controlCode, byte[] writeBuffer)
{
uint bytesReturned = 0;
fixed(byte *inBuffer = writeBuffer)
{
var success = false;
try
{
success = InteropKernel32.DeviceIoControl(_writeHandle,
controlCode,
inBuffer,
writeBuffer == null ? 0 : (uint)writeBuffer.Length,
null,
0,
ref bytesReturned,
null);
}
catch (ObjectDisposedException)
{
throw new Exception("File handle already closed");
}
// retrieve the error on failures
if (!success)
{
HandleIOError(false);
}
}
}
public unsafe void ReadControlOverlapped(uint controlCode, byte[] writeBuffer, byte[] readBuffer)
{
var completedEvent = new ManualResetEvent(false);
uint bytesReturned = 0;
var inOverlapped = new Overlapped();
inOverlapped.EventHandleIntPtr = completedEvent.SafeWaitHandle.DangerousGetHandle();
NativeOverlapped *inNativeOverlapped = inOverlapped.Pack(null, null);
try
{
fixed(byte *inBuffer = writeBuffer)
{
fixed(byte *outBuffer = readBuffer)
{
var success = false;
try
{
success = InteropKernel32.DeviceIoControl(_readHandle,
controlCode,
inBuffer,
writeBuffer == null ? 0 : (uint)writeBuffer.Length,
outBuffer,
readBuffer == null ? 0 : (uint)readBuffer.Length,
ref bytesReturned,
inNativeOverlapped);
}
catch (ObjectDisposedException)
{
throw new Exception("File handle already closed");
}
if (!success)
{
HandleIOError(true);
CancelOverlapped(_readHandle, completedEvent);
}
}
}
}
finally
{
Overlapped.Free(inNativeOverlapped);
}
}