private async void RunPipeClient(NamedPipeClientStream pipe)
{
try {
Log("Connecting to pipe stream...");
await pipe.ConnectAsync(_ctsPipeClient.Token);
Log("done\r\n");
while (!_die)
{
byte[] buffer = new byte[512];
int bytesRead = await pipe.ReadAsync(buffer, 0, buffer.Length, _ctsPipeClient.Token);
if (bytesRead == Marshal.SizeOf <PipeMessage>())
{
// assume that it is, in fact, a pipe_msg
GCHandle handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
PipeMessage message = (PipeMessage)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(PipeMessage));
handle.Free();
HandleMessage(message);
}
}
}
catch {
Log("Pipe connection broken\r\n");
}
}
private void RequestFrame(bool log)
{
if (_pipeClient == null)
{
Log("No pipe to write to!");
return;
}
if (_surfaceRequestType != _lastFrame.SurfaceType)
{
// We are requesting a different surface type than the last one we received, which means hook DLL will likely
// have to reallocate the shared memory, so we must release our handles to it, as it will be allocated under
// the same name.
ReleaseHandles();
}
// define request
var msg = new PipeMessage();
msg.MessageType = PipeMessageType.FrameRequest;
msg.request = new PipeRequest();
msg.request.DestinationBuffer = _lastRequest.DestinationBuffer == DestinationBuffer.Buffer1
? DestinationBuffer.Buffer2
: DestinationBuffer.Buffer1; // alternate
msg.request.SurfaceType = _surfaceRequestType;
msg.request.CustomOffset = _customRequestOffset;
// convert to payload
int size = Marshal.SizeOf(msg);
byte[] buff = new byte[size];
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(msg, ptr, true);
Marshal.Copy(ptr, buff, 0, size);
Marshal.FreeHGlobal(ptr);
try {
if (log)
{
Log("Requesting next frame...");
}
lock (requestLock) {
_pipeClient.Write(buff, 0, size);
_lastRequest = msg.request;
}
if (log)
{
Log("done\r\n");
}
}
catch (ObjectDisposedException) { }
catch (IOException) { }
}
private void HandleMessage(PipeMessage message)
{
if (message.MessageType == PipeMessageType.FrameAvailable)
{
lock (requestLock) {
if (message.frame.DestBuffer != _lastRequest.DestinationBuffer)
{
// Drop this frame, it's from an older outstanding request for which we may no longer
// have the associated map view handles.
return;
}
}
Bitmap img;
failCounter = 0;
lock (mapViewLock)
img = ImageFromMappedFileView(message.frame);
lock (canvas.ImageLock)
canvas.Image = img;
if (cbAutoRefresh.Checked)
{
// request next image in alternating buffer
RequestFrame(false);
}
else
{
Log($"Received frame #{message.frame.FrameNumber} of size {message.frame.Width}x{message.frame.Height} in buffer {(int)message.frame.DestBuffer}\r\n");
}
}
else if (message.MessageType == PipeMessageType.FrameRequestFailed)
{
failCounter++;
if (failCounter < 2)
{
RequestFrame(false);
}
else
{
BeginInvoke((Action) delegate {
Log("Outstanding request failed successively, disabling auto-refresh\r\n");
cbAutoRefresh.Checked = false;
});
}
}
}
