The TB_BUTTONSTRUCTSIZE message specifies the size of the TBBUTTON structure.
wParam = (WPARAM) cb; lParam = 0;
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.
No return value.
CreateWindowEx, TB_ADDBITMAP, TB_ADDBUTTONS, TBBUTTON
file: /Techref/os/win/api/win32/mess/src/msg16_16.htm, 1KB, , updated: 2000/4/7 12:20, local time: 2024/9/1 16:19,
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