Qutestion about combo box, I know I should not post this thread in this place, but...

[naruto]

case IDB_CHOOSE:
   cob_hwnd = GetDlgItem(hwnd,COB_COUNTRY);
   cob_pos = (int)SendMessage(cob_hwnd,CB_GETCURSEL,0,0);
   if(CB_ERR == SendDlgItemMessage
                         (hwnd,COB_COUNTRY,
                          CB_GETLBTEXT,
                          (WPARAM)1,(LPARAM)(LPCSTR)szCountryname)  
   {
         error = GetLastError();
         MessageBox(hwnd,"ttt","ttt",MB_OK);
    }	
   SetDlgItemText(hwnd,IDE_COUNTRYCODE,szCountryname);
   break;

COB_COUNTRY is the resource id of a combo box

the error code is 1400, that means invalid window handle.

In MSDN specification:
"The return value is the length of the string, in bytes, excluding the terminating null character. If the index parameter does not specify a valid index, the return value is CB_ERR. "

But I set a break point in first SendMessage statement, the cob_pos is a correct return value.

I've met this problem in many other programs, not only in combo box control, but also in other controls.

[naruto]

oops the forth parameter of the second SendMessage statement should be "cob_pos"

[sand_man]

This should be in the windows programming forum