[灌水]怎么判断文件是否锁定的函数

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'The following sample Visual Basic for Applications macro calls the function FileLocked and
'passes the full path and name of the file for testing. If the function returns True, error
'number 70 "ermission Denied" has most likely occurred, and the file is currently open and
'locked by another process. If the function returns False, the file is not open, and the
'macro opens the document.

Sub IsFileLocked()
   Dim strFileName As String

   ' Full path and name of file.
   strFileName = "C:\test.doc"

   ' Call function to test file lock.
   If Not FileLocked(strFileName) Then
      ' If the function returns False, open the document.
      Documents.Open strFileName
   End If
End Sub


Function FileLocked(strFileName As String) As Boolean
   On Error Resume Next

   ' If the file is already opened by another process,
   ' and the specified type of access is not allowed,
   ' the Open operation fails and an error occurs.
   Open strFileName For Binary Access Read Lock Read As #1
   Close #1

   ' If an error occurs, the document is currently open.
   If Err.Number <> 0 Then
      ' Display the error number and description.
      MsgBox "Error #" & Str(Err.Number) & " - " & Err.Description
      FileLocked = True
      Err.Clear
   End If
End Function