如何检查文件是否存在？

Question

我想检查文件是否存在，如果存在，我想打开它并读取第一行，

如果文件不存在或者文件没有​​内容，那么我想默默地失败而不让任何人知道发生错误。

Answer 1

从这里开始：

Set fso = CreateObject("Scripting.FileSystemObject")
If (fso.FileExists(path)) Then
   msg = path & " exists."
Else
   msg = path & " doesn't exist."
End If

取自文档。

Answer 2

对于任何正在寻找一种方法来观察 VBS 中存在的特定文件的人：

Function bIsFileDownloaded(strPath, timeout)
  Dim FSO, fileIsDownloaded
  set FSO = CreateObject("Scripting.FileSystemObject")
  fileIsDownloaded = false
  limit = DateAdd("s", timeout, Now)
  Do While Now < limit
    If FSO.FileExists(strPath) Then : fileIsDownloaded = True : Exit Do : End If
    WScript.Sleep 1000      
  Loop
  Set FSO = Nothing
  bIsFileDownloaded = fileIsDownloaded
End Function

用法：

FileName = "C:\test.txt"
fileIsDownloaded = bIsFileDownloaded(FileName, 5) ' keep watching for 5 seconds

If fileIsDownloaded Then
  WScript.Echo Now & " File is Downloaded: " & FileName
Else
  WScript.Echo Now & " Timeout, file not found: " & FileName 
End If

Answer 3

现有文件夹将因 FileExists

Function FileExists(strFileName)
' Check if a file exists - returns True or False

使用而不是或另外使用而失败：

Function FolderExists(strFolderPath)
' Check if a path exists