Class name, HWNDs from PID

how do I get class name and HWNDs of a proce开发者_如何学Pythonss where only PID is known?

I need to set focus on a particular window of a process.

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There is no way to go directly from PID >> HWND since a PID can own multiple windows. You can however go the other way round.

• Enumerate all top-level windows (EnumWindows)
• In the callback, get each window's associated PID (GetWindowThreadProcessId) and class name (GetClassName)
• If it's a match, set the focus (SetForegroundWindow)