Problem with Combo Box

This is a discussion on Problem with Combo Box within the Windows Programming forums, part of the Platform Specific Boards category; Can't get a combo box to display its content. If I query for its content, it seems to be working ...

  1. #1
    Work in Progress..... Jaken Veina's Avatar
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    Problem with Combo Box

    Can't get a combo box to display its content. If I query for its content, it seems to be working fine. CB_GETCOUNT returns the correct number, for example. I'm not sure what to make of it...

    Code:
    DLG_MASTERCONFIGURE DIALOG 0, 0, 260, 140
    .....
       BEGIN
          .....
          COMBOBOX                               IDCMB_SCREENNUM,   18, 88,  35,  13, CBS_DROPDOWNLIST | CBS_SORT | WS_VSCROLL
          .....
       END
    Code:
        case WM_INITDIALOG:
         {
          int si;
          char ScreenNum[3];
          for(si = 1; si <= NumberOfScreens; ++si)
           {
            snprintf(ScreenNum, 3, "%i", si);
            SendDlgItemMessage(hDlg, IDCMB_SCREENNUM, CB_ADDSTRING, 0, (LPARAM)ScreenNum);
           }
         }
        break;
    Code:
    void function(void)
     {
      function();
     }

  2. #2
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    Because the combobox is too small (the height). Try to change to:

    Code:
    COMBOBOX IDCMB_SCREENNUM,18,88,35,100,CBS_DROPDOWNLIST|CBS_SORT|WS_VSCROLL
    Now it will expand the list since 100px height, and if there's more items it will also show a vertical scroll bar.

    Hope that helps
    Niara

  3. #3
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    Ah, you can also set the first item selected using:

    Code:
    SendDlgItemMessage(hwnd,IDCMB_SCREENNUM,CB_SETCURSEL,(WPARAM)0,0);
    Niara

  4. #4
    Work in Progress..... Jaken Veina's Avatar
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    The height corresponds to the list portion? That's annoying. Thanks for the tip.
    Code:
    void function(void)
     {
      function();
     }

  5. #5
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    Yes, the height in that case it corresponds to the max height that the expanded list can have. So if you set a height of 100px and 3 items to show each of 25px, it will show a list of 3*25px, but if you have 5 items it will show a list of 100px with a vertical scroll (if you have defined that the control can have a vscroll, of course). Or that's how I understand that, if it's wrong please correct

    Niara

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