Thread: Getting index of chosen item in the combo box

  1. #1
    Registered User
    Join Date
    Dec 2005

    Getting index of chosen item in the combo box

    How do you get the index of the chosen item in the combo box...

    if( HIWORD(wParam)==CBN_SELCHANGE)
     int index =  SendMessage( hwnd, CB_GETCURSEL, (WPARAM) wParam, (LPARAM) lParam ); 
    MessageBox(hwnd,	(LPCTSTR) index , (LPCTSTR)  "The Index is",MB_ICONINFORMATION);
    How would you determine the index number of the combo box? i could get the text but not the index.

    And a general question... when you do combo box (set of conditions) how do you do the conditionals (if...else, switch) do you make the condition thru its name or thru its index?


  2. #2
    Even death may die... Dante Shamest's Avatar
    Join Date
    Apr 2003
    Doesn't CB_GETCURSEL work for you?

  3. #3
    Registered User
    Join Date
    Dec 2005
    no it doesn't.

    will it should have a return value of the selected index? it only returns nothing in my case...

  4. #4
    Join Date
    Jan 2002
    Quote Originally Posted by msdn CB_GETCURSEL
    The return value is the zero-based index of the currently selected item.
    In any event
    MessageBox(hwnd, (LPCTSTR) index,(LPCTSTR)  "The Index is",MB_ICONINFORMATION);
    is rubbish: 'index' is a numeric variable, MessageBox requires strings.

    Either use something like
    TCHAR buffer[16];
    or use a stringstream to convert that number to a string.

    Try not to cast so much and your compiler should give you important information about what's going wrong; you certainly shouldn't need to cast a string to a string as you have done for the third parameter of your MessageBox call.
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

  5. #5
    Registered User
    Join Date
    Dec 2005
    @Ken Fitlike

    Thank you for suggesting that i should convert the number into string.

    Anyway i have solve the problem by using SendDlgItemMessage(...) instead. It seems it needs to know the resource id of the combo box.

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