C / C++ / MFC

case WM_PAINT:<br />
            hdc=CreateDC("DISPLAY",NULL,NULL,NULL); <br />
            ///othe lines of your program<br />
            MoveToEx(hdc,15,15,NULL);<br />
            LineTo(hdc,150,150);<br />
            DeleteDC(hdc);<br />
           break;

long lp=0;<br />
EnumWindows((WNDENUMPROC)EnumProc,lp); //enum all windows <br />
                                       //using EnumProc function <br />
                                       //defined below as example<br />
bool __stdcall EnumProc(HWND hWnd,/*LPARAM*/long/*lp*/)<br />
{<br />
   unsigned long* pPid;   //LPDWORD<br />
   unsigned long result;      //DWORD<br />
   void *hg;                  //HGLOBAL<br />
   unsigned long id;<br />
<br />
   if(hWnd==NULL)<br />
      return false;<br />
<br />
   hg = GlobalAlloc(GMEM_SHARE,sizeof(unsigned long));<br />
   pPid = (unsigned long *)GlobalLock(hg);<br />
<br />
   result = GetWindowThreadProcessId(hWnd,pPid);<br />
<br />
   if(result){<br />
    if(*pPid==MyPID) //if enumed pPid==your concrete PID <br />
                     //defined somewhere outside <br />
     {<br />
      WindowYouWantToDrawOn=hWnd;<br />
      return false;<br />
     }<br />
   }<br />
   else{<br />
      GlobalUnlock(hg);<br />
      GlobalFree(hg);<br />
      return false;<br />
   }<br />
   GlobalUnlock(hg);<br />
   GlobalFree(hg);<br />
   return true;<br />
}<br />
//If you chose correct PID you have got your desired handle to the <br />
//window you want to draw on<br />
//next you can get the desired window's context device <br />
hdc=GetWindowDC(WindowYouWantToDrawOn);

urid wrote:

How can i change the minimize and maximize boxes icons in window?

Kiethnt wrote:

Sorry I confused some where. so let me post this massage again.