TB_BUTTONSTRUCTSIZE message

Specifies the size of the TBBUTTON structure.

Parameters

wParam

Size, in bytes, of the TBBUTTON structure.

lParam

Must be zero.

Return value

No return value.

Remarks

The system uses the size to determine which version of the common control dynamic-link library (DLL) is being used.

If an application uses the CreateWindowEx function to create the toolbar, the application must send this message to the toolbar before sending the TB_ADDBITMAP or TB_ADDBUTTONS message. The CreateToolbarEx function automatically sends TB_BUTTONSTRUCTSIZE, and the size of the TBBUTTON structure is a parameter of the function.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	Commctrl.h