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Public Class Form1
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As IntPtr
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim testPtr As IntPtr, testStr As String
testStr = "测试窗口标题123"
Debug.WriteLine("前:" & testStr)
testPtr = FindWindow(vbNullString, testStr)
Debug.WriteLine("后:" & testStr)
End Sub
End Class