private static IBuffer GetVisualPixelBuffer(IntPtr hEvent, IntPtr hMap, uint cbMap)
{
try
{
const int WAIT_OBJECT_0 = 0;
const int WAIT_TIMEOUT = 0x00000102;
uint waitRet = Win32Interop.WaitForSingleObject(hEvent, 5000);
if (waitRet == WAIT_OBJECT_0)
{
IntPtr pbMap = Win32Interop.MapViewOfFile(hMap, (uint)Win32Interop.FileMapAccess.FileMapRead, 0, 0, IntPtr.Zero);
if (pbMap != IntPtr.Zero)
{
byte[] managedBuffer = new byte[cbMap];
Marshal.Copy(pbMap, managedBuffer, 0, (int)cbMap);
return(managedBuffer.AsBuffer()); // Note that the finally block still executes
}
else
{
return(null);
}
}
else if (waitRet == WAIT_TIMEOUT)
{
throw new TimeoutException("RenderVisual Timed Out!");
}
else
{
throw new InvalidOperationException($"RenderVisual event wait failed (0x{waitRet:x8}): {Marshal.GetLastWin32Error()}");
}
}
finally
{
Win32Interop.CloseHandle(hMap);
Win32Interop.CloseHandle(hEvent);
}
}
public static int PInvokeTest()
{
Win32Interop.CloseHandle(IntPtr.Zero);
return(Marshal.GetLastWin32Error());
}
private void VideoCleanup(IntPtr opaque)
{
myBitmap = null;
Win32Interop.UnmapViewOfFile(opaque);
Win32Interop.CloseHandle(myBitmapSectionPointer);
}
