TCM_SETITEMEXTRA - Win32 Programmer's Reference

Win32 Programmer's Reference

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Windows NT
Yes
Win95
Yes
Win32s
Yes
Import Library
-
Header File
commctrl.h
Unicode
No
Platform Notes
None

TCM_SETITEMEXTRA

The TCM_SETITEMEXTRA message sets the number of bytes per tab reserved for application-defined data in a tab control. You can send this message explicitly or by using the TabCtrl_SetItemExtra macro.

TCM_SETITEMEXTRA

wParam = (WPARAM) (int) cb; // number of extra bytes

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

Parameters
cb

Number of extra bytes.

Return Values
Returns TRUE if successful or FALSE otherwise.

Remarks
By default, the number of extra bytes is four. An application that changes the number of extra bytes cannot use the TC_ITEM structure to retrieve and set the application-defined data for a tab. Instead, you must define a new structure that consists of the TC_ITEMHEADER structure followed by application-defined members.

An application should only change the number of extra bytes when a tab control does not contain any tabs.

See Also
TabCtrl_SetItemExtra, TC_ITEM, TC_ITEMHEADER

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