你可以使用API函数FindWindow和PostMessage去寻找指定的窗口，并关闭它。下面的例子教给你怎样找到并关掉一个Caption为“Caluclator”的程序。
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Dim winHwnd As Long
Dim RetVal As Long
winHwnd = FindWindow(VBNullString, "Calculator")
Debug.Print winHwnd
If winHwnd <> 0 Then
RetVal = PostMessage(winHwnd, WM_CLOSE, 0&, 0&)
If RetVal = 0 Then
MsgBox "置入消息错误！"
End If
Else
MsgBox "Calculator没有打开！"
End If
为了让以上的代码工作，你必须在模块文件中什么以下API函数：
Declare Function FindWindow Lib "user32" Alias _
"FindWindowA" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As Long
Declare Function PostMessage Lib "user32" Alias _
"PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long
Public Const WM_CLOSE = &H10 |
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