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Combo Boxes

Started by dta1 Aug 4, 2002 at 5:30 AM 2 replies 350+ views

Original Post

Aug 4, 2002 at 5:30 AM

How do you define the listbox items? (using MSDEV 6.0) And how do you use them? I want to change a value depending on what listbox choise you choose.

Crispy

170

Crispy

Aug 4, 2002 at 7:13 AM

quote:
Original post by dta1
How do you define the listbox items? (using MSDEV 6.0)
And how do you use them?

I want to change a value depending on what listbox choise you choose.

SendMessage(CB_ADDSTRING, ...) to add a string and other CB_XXX messages to do other cool stuff.

Capture CBN_XXX notification messages to keep track of changes in the combobox. Just go to MSDN and find out for yourself.

Hope this helps,
Crispy

dta1

Author

dta1

Aug 4, 2002 at 9:35 AM

Thanks, but a link would be appreciated.

And, I think the best would be to see an example app using a combo box if you would happen to know where to find one.

[edited by - dta1 on August 4, 2002 10:43:29 AM]

Crispy

170

Crispy

Aug 4, 2002 at 10:53 AM

    
UINT id = 8800;

WinMain(...)
{
...
UINT style = CBS_DROPDOWN | CBS_HASSTRINGS | WS_VISIBLE | WS_CHILD;
UINT styleEx = 0;
cbHandle = CreateWindowEx(styleEx, "combobox", "I am the caption", style, 100, 100, 80, 400, hWnd, (HMENU)id, hInstance, (LPVOID)NULL);
...
}

WndProc(...)
{
  switch(uMsg)
    {
    case WM_COMMAND:
      switch(HIWORD(wParam))
        {
        case CBN_SELCHANGE:
          //check if it's our control

          if(LOWORD(wParam) == id)
            MessageBox(0, "SelChange", "Boo!", MB_OK | MB_ICONDRINKME);
        return 0;
        }
    return 0;
    }
return DefWndProcThingie(..);
}

There you have it - a not-so-definitely working implementation of the combobox control (untested).

Here's a link: link

NOTE: always make sure your combobox HEIGHT is equal to the height you want it to be when dropped down! Setting it to 12 or something will only show you the edit control and you'll end up breaking your head with why strings that are added to the combobox do not end up there.

Crispy

edit: CBN_SELCHANGE, not CBN_SELCHANGED

[edited by - crispy on August 4, 2002 11:58:53 AM]

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