Public Declare Function GetMessage Lib "user32" Alias "GetMessageA" (lpMsg As MSG, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long) As Long
Declare Function PostMessage& Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any)
hwnd :接收消息的那个窗口的句柄。如设为HWND_BROADCAST,表示投递给系统中的所有顶级窗口。如设为零,表示投递一条线程消息(参考PostThreadMessage)
wMsg :消息标识符
wParam :具体由消息决定
lParam :具体由消息决定
具体请看MSDN