I’m developing a screen capture application using DirectX 11 and the Desktop Duplication API in C++. The goal is to capture the screen content and process it. However, I’m encountering an issue where the captured frame data is always all zeros.

I wrote a code using c++ and directx to make a small rectangle move quickly on the screen. To make the rectangle, I glued two triangles together and timed it to determine its position. The moving rectangle make long tail on the screen which I didn’t expecte.