Send an LB_GETCURSEL message to retrieve the index of the currently selected item, if any, in a single-selection list box.

LB_GETCURSEL
wParam = 0; // not used; must be zero
lParam = 0; // not used; must be zero

Parameters

This message has no parameters.

Return Values

In a single-selection list box, the return value is the zero-based index of the currently selected item. If there is no selection, the return value is LB_ERR.

An application sends an LB_DELETESTRING message to delete a string in a list box.

LB_DELETESTRING
wParam = (WPARAM) index; // index of string to delete
lParam = 0; // not used; must be zero

Parameters

index

Value of wParam. Specifies the zero-based index of the string to be deleted.
Windows 95: The wParam parameter is limited to 16-bit values. This means list boxes cannot contain more than 32,767 items. Although the number of items is restricted, the total size in bytes of the items in a listbox is limited only by available memory.

Return Values

The return value is a count of the strings remaining in the list. The return value is LB_ERR if the index parameter specifies an index greater than the number of items in the list.