The DDX_CBStringExact function manages the transfer of CString data between the edit control of a list box control in a dialog box, form view, or control view object and a CString data member of the dialog box, form view, or control view object.
void AFXAPI DDX_LBStringExact( CDataExchange* pDX, int nIDC, CString& value );
A pointer to a CDataExchange object. The framework supplies this object to establish the context of the data exchange, including its direction.
The resource ID of the list box control associated with the control property.
A reference to a member variable of the dialog box, form view, or control view object with which data is exchanged.
When DDX_LBStringExact is called to transfer data to a list box control, the first item in the control that matches value is selected. (To match just a prefix rather than the entire item, use DDX_LBString.) If there are no matches, no items are selected. The matching is case-insensitive.
When DDX_CBStringExact is called to transfer data from a list box control, value is set to the current list box selection. If no item is selected, value is set to a string of zero length.
If the list box is a drop-down list box, the value exchanged is limited to 255 characters.
For more information about DDX, see Dialog Data Exchange and Validation.