当用户单击禁用的窗口（通过 EnableWindow(hwnd, FALSE) 禁用）时，如何以编程方式阻止 Windows 播放“默认提示音”声音？

Question

When a window is disabled via EnableWindow(hwnd, FALSE), and the user clicks on it, then the "Default Beep" sound gets played. I don't want this to happen. How can I disable this behavior programatically for the current Process in C/C++ with Win32 code?

Answer 1

The beep is generated by the default window processing of the WM_SETCURSOR message.

From docs for WM_SETCURSOR :

If the low-order word of the lParam parameter is HTERROR and the high-order word of lParam specifies that one of the mouse buttons is pressed, DefWindowProc calls the MessageBeep function.

To prevent the beep, your window procedure should handle WM_SETCURSOR and not call DefWindowProc under those conditions.