Changing other application's object values. Pls. help.

[coolphilboy]

I would like to change a textbox values and properties of another application, is it possible? I have an existing application i don't have the source code and i would like to change the value of one of its textboxes, is it possible?

thanks for any help extended.

 

[cpjust]

I know it's possible because Visual Test does it.
First you would need to use FindWindow() or FindWindowEx() to get a handle to the window. After that I'm not sure how to get to the right edit control other than tabbing.
Does anyone know what the next step is?

 

[mingis]

?here are also call GetWindowByName() to find parent window of the control. Then GetChildWindow() could be used - in case if you know exact order number of the control - it could be found experimentally. Then you could send any Windows messages like SET_TEXT to that control window.

 

[cpjust]

I can't find a GetWindowByName() or GetChildWindow() in the MSDN. Are those newer APIs? (They sound familiar)
Where can I find info about them? Thanks.

 

[mingis]

Sorry, these were my internal things :

HWND GetWindowByName(const unsigned char *lpszWinName, bool bFullName)
{
HWND cur_wnd;
unsigned char str_buf[KP_MAX_FNAME_LEN+1];

   cur_wnd=GetTopWindow(NULL);

   while(cur_wnd!=NULL)
   {
      if(GetWindowText(cur_wnd, (char *)str_buf, KP_MAX_FNAME_LEN)>0)
      {
         if(bFullName)
         {
            if(strcmp(str_buf, lpszWinName)==0)
               break;
         }
         else
         {
            if(strstr(str_buf, lpszWinName)!=NULL)
               break;
         }
      }
      
      cur_wnd=GetWindow(cur_wnd, GW_HWNDNEXT);
   }

return(cur_wnd);
}


HWND GetChildWindow(HWND wParent, int iOrderNumber)
{
HWND cur_wnd=NULL;
int ii;

   if(wParent!=NULL)
   {
      cur_wnd=GetWindow(wParent, GW_CHILD);
      for(ii=0; ii<iOrderNumber; ii++)
      {
         if(cur_wnd!=NULL) cur_wnd=GetWindow(cur_wnd, GW_HWNDNEXT);
         else
         {
// -------------- error
            break;
         }
      }
   }
   else
   {
// ------------ error
   }

return(cur_wnd);
}


void SendStringToWindow(HWND wWindow, const unsigned char *lpszOutStr)
{
const unsigned char *pnts;

   if((wWindow!=NULL) && (lpszOutStr!=NULL))
   {
      pnts=lpszOutStr;
      while(*pnts)
      {
//       SendMessage(wWindow, WM_CHAR, *pnts++, 0);
         PostMessage(wWindow, WM_CHAR, *pnts++, 0);
         Sleep(100);
      }
   }
   else
   {
// ------------ error
   }
}

 

[cpjust]

Wow, thanks. I haven't done Windows programming for a while, so I forgot that each component is considered a window too...