Thread: I need help disabling Keyboard and Mouse input on Edit controls

I have posted a question on other board asking for a way to disable Keybord and Mouse input on controls without using EnableWindow(HWND, FALSE) because that makes the controls grayed, which makes it hard for the user to read it´s content.

A guy answered that a good way would be to intercept the FOCUS messages and direct the focus elsewhere.

I thought that would be a great solution, but as a beginner, i couldnt code something 100% functional.

Here´s what i have right now. The problem with this piece of code is kindda weird: It works only once, i mean, if you click over one of the controls, it does not receives the focus and the focus is sent to buttonstart (OK!). Then if you click again over any control, it receives the focus. My question is: Why the hell would this code work only for the first click?


Any help would be appreciated.

Code:

case WM_KILLFOCUS: 
if (((LOWORD(wParam))==IDC_CLEARBUTTON) || /* This are the controls that can receive focus */ 
((LOWORD(wParam))==IDC_CHECKSCROLL) || 
((LOWORD(wParam))==IDC_COPYBUTTON) || 
((LOWORD(wParam))==IDC_BUTTONSTART) || 
((LOWORD(wParam))==IDC_BUTTONSTOP) || 
((LOWORD(wParam))==IDC_BUTTONVIEWLOG) || 
((LOWORD(wParam))==IDC_BUTTONABOUT)) { 
return DefWindowProc (mainWindow, messages, wParam, lParam); 
return 0; 
} 
else { /* For the controls that cannot receive focus */ 
SetFocus(buttonstart); /*Lets set the focus elsewhere */ 
return 0; 
}

>>My question is: Why the hell would this code work only for the first click? <<

Bad luck.

The WM_KILLFOCUS message's WPARAM is the handle of the window that is receiving the keyboard focus.

LOWORD(wParam) for this msg will give you garbage.

Try checking the wParam against the control handles or, alternatively, use something like GetDlgCtrlID to convert the window handle (WPARAM) into an int id for checking against the id's of your controls. eg

Code:

case WM_KILLFOCUS:
  {
  int nWndID=GetDlgCtrlID((HWND)wParam);
  /*check nWndID against control id's*/
  return 0; 
}

Thanks for your reply Ken,
I have tried to correct my code the way you wrote on your post, but the program is behaving in the exact same way Works for the first click and thats it.
I can´t find where the error is :\

Code:

case WM_KILLFOCUS: 
      nWndID=GetDlgCtrlID((HWND)wParam);    
        if ((nWndID==IDC_CHECKSCROLL) ||
           (nWndID==IDC_CLEARBUTTON) ||
           (nWndID==IDC_COPYBUTTON) ||
           (nWndID==IDC_BUTTONSTART) ||
           (nWndID==IDC_BUTTONSTOP) ||
           (nWndID==IDC_BUTTONVIEWLOG) ||
           (nWndID==IDC_BUTTONABOUT)) {
          return DefWindowProc (mainWindow, messages, wParam, lParam); 
        } 
        else {                                 /* For the controls that cannot receive focus */ 
          SetFocus(buttonstart);               /* Lets set the focus elsewhere */ 
          return 0; 
        }

Finally EN_SETFOCUS solved the problem, first time i use it...

Code:

case WM_COMMAND: 
      
      if (((HIWORD(wParam))==EN_SETFOCUS) && (tabnumber==0) && (allcreated==1)) {
        SetFocus(NULL);
        return 0;
      }