vb如何向所有窗口广播一条WM_SETTINGCHANGE消息?

vb如何向所有窗口广播一条WM_SETTINGCHANGE消息？

定义常量
Const HWND_BRODCAST = &HFFFF&
Const WM_SETTINGCHANGE = &H1A&

定义API
Declare Function SendMessage& Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any)

发送消息
SendMessage HWND_BRODCAST , WM_SETTINGCHANGE , 0& , 0&

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