如何在 windows 上捕获桌面，以便捕获 DirectX 和正常渲染的屏幕部分？

Question

Simple example - on one side we see camera rendered via standard software rendered "Input" on other hand (labeled "Output") rendered via some directX stuff (at least it seems to me):

So what function is provided by windows api or DirectX api for capturing such mixed scenes?

Answer 1

TightVNC Server can do it, you may want to look into what they are doing. From a simple glance through their source code it looks like they are creating a virtual screen that mirrors the primary screen. Specifically though, look into the CreateCompatibleDC and CreateDIBSection API's

Answer 2

As I known, there is not a direct way to capture DirectX render area, although we can see that on the screen. Because the real render action(aka render instruction) happens in hardware layer. So the API in standard SDK cannot know the finally render result, which lead to the black square.

The only way to do this maybe put your hope on the Render layer(such as DirectX engine) itself can support output interface as well as underlying render action. So I suggest to check some documentation to find if there indeed is.

Answer 3

DirectX can present to a limited subsection of the window that you give it, enabling you to create small regions of DX content in larger windows.