An application sends an LB_GETSELITEMS message to fill a buffer with an array of integers that specify the item numbers of selected items in a multiple-selection list box.
LB_GETSELITEMS wParam = (WPARAM) cItems; // maximum number of items lParam = (LPARAM) (LPINT) lpnItems; // address of buffer
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.
The return value is the number of items placed in the buffer. If the list box is a single-selection list box, the return value is LB_ERR.
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