The desktop capture with DirectX does not work

Question

Because processing was slow by D3DPOOL_SCRATCH, I wrote the desktop capture program to reference for the report on the Internet. However, a result is a pitch-black picture.

Answer 1

This is nothing related to the application type, if you want to get the data of desktop image, you should use the following function

GetFrontBufferData

So instead of calling

d3ddev->GetRenderTarget(0, &render);
d3ddev->GetRenderTargetData(render, dest);

You should call

d3ddev->GetFrontBufferData(0, dest);