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LB_SETCOUNT Overview  Group

An application sends an LB_SETCOUNT message to set the count of items in a list box created with the LBS_NODATA style and not created with the LBS_HASSTRINGS style.


wParam = (WPARAM) (int) cItems; // count of list box items 

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



Value of wParam. Specifies the new count of items in the list box.

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

If an error occurs, the return value is LB_ERR. If there is insufficient memory to store the items, the return value is LB_ERRSPACE.


The LB_SETCOUNT message is supported only by list boxes created with the LBS_NODATA style and not created with the LBS_HASSTRINGS style. All other list boxes return LB_ERR.

See Also


file: /Techref/os/win/api/win32/mess/src/msg11_1.htm, 1KB, , updated: 2000/4/7 12:20, local time: 2022/8/17 21:46,

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