The GetWindowThreadProcessId function retrieves the identifier of the thread that created the specified window and, optionally, the identifier of the process that created the window.
Syntax
DWORD GetWindowThreadProcessId( HWND hWnd, LPDWORD lpdwProcessId );
Parameters
hWnd [in] Handle to the window. lpdwProcessId [out] Pointer to a variable that receives the process identifier. If this parameter is not NULL, GetWindowThreadProcessId copies the identifier of the process to the variable; otherwise, it does not.
Return Value
The return value is the identifier of the thread that created the window.
Function Information
Minimum DLL Versionuser32.dllHeaderDeclared in Winuser.h, include Windows.hImport libraryUser32.libMinimum operating systems Windows 95, Windows NT 3.1
See Also
Windows Overview
<DllImport("user32.dll", CharSet:=CharSet.Auto, SetLastError:=True)> _Public Shared Function GetWindowThreadProcessId(ByVal handle As IntPtr, <Out> ByRef processId As Integer) As Integer End Function
[DllImport("user32.dll", CharSet=CharSet.Auto, SetLastError=true)] public static extern int GetWindowThreadProcessId(HandleRef handle, out int processId);