Find process id by window's handle

Question

I have a problem with getting a specific PID of a process, the problem with this process is that it's a hidden process, it's not showing on task manager / PowerShell, completely hidden. What I have so far is the main window handle of this process, the question is, how can I get the pid of it. What I'm trying to do is to read the memory of this process and edit it, but can't do so without the PID I guess (since I need to get it's base address in memory). So, if anyone has any workaround or something for me, it will be great. P.S: this process does not show in `Process.GetProcesses()`. ty!

Accepted Answer

You can use the following Windows API:

```
[DllImport("user32.dll", SetLastError=true)]
static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint processId);
```

You pass in the HWND and use the out parameter to return the PID.

You can read more on this function here on MSDN.

Find process id by window's handle

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