C / C++ / MFC

<br />
LRESULT CALLBACK MyWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)<br />
{<br />
    if (msg == WM_PAINT)<br />
    {<br />
       SetWindowText(hWnd,"text");    // Changes to 'text'<br />
    }<br />
 <br />
    return(CallWindowProc(pOldWndProc, hWnd, msg, wParam, lParam));<br />
}<br />
 <br />
 <br />
LRESULT CALLBACK HookProc(int code, WPARAM wParam, LPARAM lParam)<br />
{<br />
    //dummy	<br />
    return(CallNextHookEx(hHook, code, wParam, lParam));<br />
}<br />
 <br />
BOOL APIENTRY DllMain(HANDLE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved)<br />
{<br />
   hMod	= (HINSTANCE) hModule; <br />
<br />
   if (ul_reason_for_call == DLL_PROCESS_ATTACH)<br />
   {<br />
   HWND hWnd = CreateWindow("BUTTON","",0, 0, 0, 0, 0,NULL, NULL, hMod, NULL);           <br />
   pOldWndProc = (WNDPROC)SetClassLong(hWnd,GCL_WNDPROC	,(LONG)MyWndProc);    //Modifies procedure<br />
   DestroyWindow(hWnd);<br />
   }<br />
    return TRUE;<br />
}<br />
<br />
__declspec(dllexport) void DemarrerHook()           // Called from my EXE<br />
{<br />
hHook = SetWindowsHookEx(WH_CALLWNDPROC, HookProc, hMod, 0);<br />
}