MFC ComboBox probs
Author
Hey,
I am working on a level editor and I am having some problems with ComboBoxs. The first thing I do is retrieve it from the dialog that it is in(created in MSVC dialog editor).
m_pCBObjectType = (CComboBox*) m_RBar.GetDlgItem (IDC_NEWOBJECT_TYPE);
I then use AddString to add four strings.
m_pCBObjectType->AddString("Box");
m_pCBObjectType->AddString("Triangle");
m_pCBObjectType->AddString("Sphere");
m_pCBObjectType->AddString("Cone");
According to my bookon MFC this should work. Is there something that I have to do to display it? Thanks.
InFerN0
Not all who wander are lost...
Hmm. Your wording is a bit cryptic. Do you mean that you can''t see the combo box or that you can''t see the added strings?
For that matter, if you''re using the editor anyway, and the strings you''re using are fixed (they''re the only things you''re going to display), why not just right click on the combobox in the editor, go to "Properties", hit the "Data" tab, and enter your strings there and not go to the hassle?
It''s also possible that you aren''t seeing the strings because you haven''t expanded the dropdown list size sufficiently to see it, in which case click the down arrow over on the right. You will see the extents of the dropdown list. Resize it appropriately.
-fel
For that matter, if you''re using the editor anyway, and the strings you''re using are fixed (they''re the only things you''re going to display), why not just right click on the combobox in the editor, go to "Properties", hit the "Data" tab, and enter your strings there and not go to the hassle?
It''s also possible that you aren''t seeing the strings because you haven''t expanded the dropdown list size sufficiently to see it, in which case click the down arrow over on the right. You will see the extents of the dropdown list. Resize it appropriately.
-fel
Hmm...
Can you do any other operations to the combo box?
What about using the Class Wizard to map a variable to the Control. e.g. set a variable m_comboboxobj to point to IDC_NEWOBJECT_TYPE.
Then from your code you could just use
m_comboboxobj.AddString(char*);
????
Can you do any other operations to the combo box?
What about using the Class Wizard to map a variable to the Control. e.g. set a variable m_comboboxobj to point to IDC_NEWOBJECT_TYPE.
Then from your code you could just use
m_comboboxobj.AddString(char*);
????
Oops - forgot to put my name on that last post. 
And I meant to say you could just
m_comboboxobj.AddString(char*);
instead of having to retrieve the DlgItem first.
E
Edited by - Eight on March 16, 2001 1:23:18 PM
And I meant to say you could just
m_comboboxobj.AddString(char*);
instead of having to retrieve the DlgItem first.
E
Edited by - Eight on March 16, 2001 1:23:18 PM
A common mistake with combo boxes (i''m not sure if this is your problem... slightly cryptic):
When you create the combo box in the Dialog Edior, you must drag it out in size so that it''s height WILL BE HOW FAR IT DROPS DOWN. Otherwise when you click it nothing happens. So in other words, when you place a combo box, drag a square, not a thin rectangle, and it should work.
You can also edit the strings in the dialog editor... but i don''t know if you can access the string tables from there ...?
When you create the combo box in the Dialog Edior, you must drag it out in size so that it''s height WILL BE HOW FAR IT DROPS DOWN. Otherwise when you click it nothing happens. So in other words, when you place a combo box, drag a square, not a thin rectangle, and it should work.
You can also edit the strings in the dialog editor... but i don''t know if you can access the string tables from there ...?
Author
Hey,
Thanks for the replies. To be more specific the box looks like it drops down but it never creates a rect below the control to put the strings in. Thanks. BTW. I can make a new combo box and it works but if I use the same ID it doesn''t.
InFerN0
Not all who wander are lost...
Thanks for the replies. To be more specific the box looks like it drops down but it never creates a rect below the control to put the strings in. Thanks. BTW. I can make a new combo box and it works but if I use the same ID it doesn''t.
InFerN0
Not all who wander are lost...
Yes, all objects in MFC (apart from static text) must have different ID numbers, or else it wont work.
If you have an existing combo box that is an incorrect size, simply click it, and drag it downwards in size. You will see what I mean once in the Resource editor...
If you have an existing combo box that is an incorrect size, simply click it, and drag it downwards in size. You will see what I mean once in the Resource editor...
To change the pull down boxes size for a combo box, click on the button in resource editor. By button I mean the actual button you would normally click on, if you were using the GUI.
The resource editor will then allow you to manipulate the pull down box vs. the actual combo box itself.
The resource editor will then allow you to manipulate the pull down box vs. the actual combo box itself.
This topic is closed to new replies.
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