What Are the Variable Types for the DDX Value Property?
The following table shows the type of DDX Value variables ClassWizard initially provides. To create additional variable types, see .**
DDX Variable Types for the Value Property
| Control | Variable type |
| Edit box | CString, int, UINT, long, DWORD, float, double, short, BOOL, COleDateTime, ColeCurrency |
| Normal check box | BOOL |
| Three-state check box | int |
| Radio button (first in group) | int |
| Nonsorted list box | Cstring, int |
| Drop-down list | Cstring, int |
| All other list box and drop-down list types | Cstring |
The following additional notes apply to using DDX Value variables:
Possible values for three-state check boxes are 0 (off), 1 (on), and 2 (indeterminate).
Values for a group of radio buttons range from 0 for the first button in the group to n–1 for a group with n buttons. A value of –1 indicates that no buttons are selected.
When you are using a group of check boxes or radio buttons with a DDX variable, set the Auto property from each control's Property window.
Set the Group property for the first radio button in a group, and make sure all the other radio buttons immediately follow the first button in the tab order.
To use an integer value with a drop-down list or list box, turn off the Sort property found on each control's Property window Styles tab.