Get process from control handle

Question

I have a handle to a control that belongs to another process in the system.
How can I get the process it belongs to? I've tried looking up a suitable function but haven't found much.

Answer 1

I suppose that by "handle to a control", you mean a HWND.

Then, use GetWindowThreadProcessId

HWND hWndToSomeControl;

[...]

DWORD dwPid;
GetWindowThreadProcessId( hWndToSomeControl, &dwPid );

Edit: error control (Tested on Windows 7):

HWND hWndToSomeControl;

[...]

DWORD dwPid;
DWORD dwTid = GetWindowThreadProcessId( hWndToSomeControl, &dwPid );
if ( dwTid == 0 ) {
    DWORD dwLE = GetLastError(); // may be 1400 ERROR_INVALID_WINDOW_HANDLE
    [...]
}