How do I get a HWND from inside a DLL?

I have a DLL that I want to play sounds using Direct Sound. In order to play sounds, I need the HWND of the executable. I don't have a HWND of the executable that lo开发者_运维问答ads the DLL. How do I get that in the DLL without passing it in from the executable?

You could use GetCurrentProcessId to get the current process Id.

You could then call EnumWindows, and check each window with GetWindowThreadProcessId to find a window associated with your process.

However, an easier option might be to just generate your own Window. You can create a 1x1 pixel window that is not visible, and use it with Direct Sound.

This has the advantage of working even if your calling process doesn't have a usable window (or deletes window handles regularly).

Call GetGUIThreadInfo on the main thread. This gets you a bunch of HWNDs. If you need a top-level HWND, pick any valid one (not all values may be filled) and find its top level ancestor with GetAncestor(GA_ROOT).