LB_GETITEMDATA

An application sends an LB_GETITEMDATA message to retrieve the application-defined 32-bit value associated with the specified list box item.

LB_GETITEMDATA 
wParam = (WPARAM) index;    // item index 
lParam = 0;                 // not used; must be zero 
 

Parameters

index
Value of wParam. Specifies the index of the item.

Windows 95 and Windows 98: 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 list box is limited only by available memory.

Return Values

The return value is the 32-bit value associated with the item, or LB_ERR if an error occurs. If the item is in an owner-drawn list box and was created without the LBS_HASSTRINGS style, this 32-bit value was in the lParam parameter of the LB_ADDSTRING or LB_INSERTSTRING message that added the item to the list box. Otherwise, it is the value in the lParam of an LB_SETITEMDATA message.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Requires version 1.0 or later.
  Header: Declared in winuser.h.

See Also

List Boxes Overview, List Box Messages, LB_ADDSTRING, LB_INSERTSTRING, LB_SETITEMDATA