Question

VB.Net中该怎么调用windows的API？

调用API时有的参数为String类型，但是VB.Net中的string类型是unicode编码，而API中的是ASII编码。直接用的话不行。比如FindWindow("Shell_TrayWnd", " ")这个API，不论怎么调用，返回值都是0.

Answer 1

1.Windows的API有两个版本的，比如ANSI的FindWindowA()，Unicode的FindWindowW()
2.两种声明的方式
<DllImport("user32.dll", CharSet:=CharSet.Auto, EntryPoint:="FindWindow")> _
Shared Function FindWindow(ByVal className As String, ByVal windowName As String) As IntPtr
End Function

Declare Auto Function FindWindow Lib "user32.dll" Alias "FindWindow" (ByVal className As String, ByVal windowName As String) As IntPtr