GetWindowThreadProcessId (urgent, pls help)

[jbchurn]

Hi Sir,

Why do i keep getting zero for the return value of GetWindowThreadProcessId?
any idea? i can't seem to get the correct value for thread id.

Please help.
Thanks in advance.

hWnd = FindWindow("WindowsApp", "Windows App"
dwPid = GetWindowThreadProcessId(hWnd, NULL);

where dwPid always zero.

 

[Leibnitz]

Maybe,you should check your syntaxe for "FindWindow":

HWND FindWindow(
LPCTSTR lpClassName, // class name
LPCTSTR lpWindowName // window name
);

 

[jbchurn]

yes, i checked.
actually i create a window with classname "WindowsApp"
and window title as "Windows App" for testing.
i even use Spy++ to confirm the classname and title. they are correct.

i attach my program as below, hope you can help me out.
cos i'm stuck here and cannot proceed.


#include <windows.h>
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {

HWND hWnd;
LPDWORD dwAA;
hWnd = FindWindow(&quot;WindowsApp&quot;, &quot;Windows App&quot;
dwThreadId = GetWindowThreadProcessId(hWnd, dwAA);

if (dwThreadId == 0) {
MessageBox(NULL, &quot;dwThreadId is zero&quot;, &quot;result&quot;, MB_OK);
}
return 0;
}