Set location of MessageBox?

Question

I want to print out a message using MessageBox (or similar). I would also like control over where exactly on the screen the box appears but can find nothing in the description o

Answer 1

Step 1: Create a CBT hook to trap the creation of the message box:

// global hook procedure
HHOOK hhookCBTProc = 0;

LRESULT CALLBACK pfnCBTMsgBoxHook(int nCode, WPARAM wParam, LPARAM lParam)
{
  if (nCode == HCBT_CREATEWND)
  {
    CREATESTRUCT *pcs = ((CBT_CREATEWND *)lParam)->lpcs;

    if ((pcs->style & WS_DLGFRAME) || (pcs->style & WS_POPUP))
    {
      HWND hwnd = (HWND)wParam;

      // At this point you have the hwnd of the newly created 
      // message box that so you can position it at will
      SetWindowPos(hwnd, ...);
    }
  }

  return (CallNextHookEx(hhookCBTProc, nCode, wParam, lParam));
}

Step 2: Install/remove the hook before and after showing the message box:

// set hook to center the message box that follows
hhookCBTProc = SetWindowsHookEx(WH_CBT, 
                                pfnCBTMsgBoxHook, 
                                0, GetCurrentThreadId());

int sResult = MessageBox(hwndParent, pszMsg, pszTitle, usStyle);

// remove the hook
UnhookWindowsHookEx(hhookCBTProc);