比如API函数PostMessage声明如下
Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
对于hwnd参数为接收消息窗口的句柄，这好理解，可wMsg，wParam，lParam这些参数怎和WM_CLOSE=&10这些常数联系起来呢，有没有什么书籍有介绍？谢谢