Question

PostMessage与PostMessageA的区别

Answer 1

声明PostMessage函数的时候（其实很多很多API函数都是这样），有两种版本：A结尾的是ANSI版本，W结尾的是Unicode版本。一般用A结尾的。你声明的时候不是也写了：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么。可见PostMessage是我们为了方便起的名字，PostMessageA才是人家的原名。

Answer 2

Public 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

PostMessageA是api函数，PostMessage不是。
PostMessage只是PostMessageA在本程序中的别称。换句话说，你可以把PostMessage改成其他名称。

Answer 3

可以简化成这样Public Declare Function PostMessageA Lib "user32" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long