Issue updating the text value for a editable combo

Question

I have a simple editable combo box on my dialog.

It has several predefined text values in the drop list. One of those entries is:

"Test 123"

The combo box is mapped to a CString variable m_strNotes.

If I do this:

m_strNotes = _T("Test");
UpdateData(FALSE);

I find that the combo box ends up with "Test 123" selected!

Instead, I have to use m_cbTextValues.SetWindowText(_T("Test")); and kind of bypass using the m_strNotes variable.

Why do I have to do this? Since CComboBox can be editable, the text does not have to be in the drop list. So when I use the former method why doesn't it just set the edit text and not try to find a suitable match in the drop list data?

Answer 1

That is the expected behavior you get with DDX_CBString which does a prefix string compare for the selection. Rather use DDX_CBStringExact for an exact match.