CComboBox

[laephy]

Hi!

Is there any function to get the total number of items in a Combobox?

Laura

[GCDEF]

Hi!

Is there any function to get the total number of items in a Combobox?

Laura

Of course. You'll find it in the documentation for CComboBox in MSDN.

http://msdn.microsoft.com/en-us/libr...=vs.71%29.aspx

[MikeAThon]

http://www.lmgtfy.com/?q=number+of+items+in+a+CCombobox

First hit

[laephy]

Thank you I found the function GetCount and it works.

There is a lot of functions related to the CComboBox and I am now learning about them.

The next function I am learning is the GetCurSel function to obtain the value of the ComboBox. I have found in google both kind of writing the function

1st way:

m_Color=((CComboBox *)GetDlgItem(IDC_COLORS))->GetCurSel()

2nd way:

DDX_Control(pDX, IDC_COLORS, m_ColorList);

m_Color=m_ColorList.GetCurSel();

which is the difference between both definitions of m_Color?

[GCDEF]

I don't understand the question.

[D_Drmmr]

1st way:

m_Color=((CComboBox *)GetDlgItem(IDC_COLORS))->GetCurSel()

2nd way:

DDX_Control(pDX, IDC_COLORS, m_ColorList);

m_Color=m_ColorList.GetCurSel();

which is the difference between both definitions of m_Color?

The definition of m_Color is likely the same (can't be sure, because you didn't show it), because it has nothing to do with the combo box. The difference between the two methods (assuming the DDX_Control statement is in the DoDataExchange member function of your dialog class) is that the second will give a debug assertion when the control with id IDC_COLORS does not exist or is not a combo box, whereas the first method will exhibit undefined behavior. So, use the second and never use the first.

[VictorN]

The next function I am learning is the GetCurSel function to obtain the value of the ComboBox.

No, it does NOT obtain "he value of the ComboBox", it obtains

The zero-based index of the currently selected item in the list box of a combo box, or CB_ERR if no item is selected.

[laephy]

Thank you for your explanation and I will use the second method.

Yes, I forgot to write the definition of m_Color, it is a integer (int m_Color) in both cases.