FileSystemObject 示例代码

在本节描述的示例代码,提供真实的例子来示范在 FileSystemObject 对象模式中可用的许多功能。该代码显示了如何一起使用对象模式的所有功能,以及如何在您自己的代码中有效地使用这些功能。

请注意,由于该代码是极一般的,所以要使该代码能够真正在您的机器上运行,可能需要一些其他代码和小小的变更。这些改变之所以必要,是因为在 Active Server Pages 和 Windows Scripting Host 之间,为输入和输出给用户采用了不同的方法。

要在 Active Server Pages 上运行该代码,则采取以下步骤:

创建一个标准的 Web 页,后缀名为 .asp。

把下面的示例代码复制到 &ltBODY>...</BODY> 标记之间的文件中。

把所有代码包装器到 <%...%> 标记内。

Option Explicit 语句从当前位置移动到 HTML 页的最顶部,甚至在 <HTML> 开始标记前。

把 <%...%> 标记放置在 Option Explicit 语句周围,以保证它在服务器端运行。

把下面的代码添加到示例代码末尾:

Sub Print(x)
   Response.Write "<PRE>&ltFONT FACE=""宋体"" SIZE=""1"">"   Response.Write x   Response.Write "</FONT></PRE>"End SubMain

前面的代码增加一个将在服务器端运行,但在客户端显示结果的打印过程。要在 Windows Scripting Host 上运行该代码,则把下面的代码添加到示例代码的末尾:

Sub Print(x)
   WScript.Echo xEnd SubMain

下面就是示例代码:

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' FileSystemObject 示例代码
'Copyright 1998 Microsoft Corporation。   保留所有权利。 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Option Explicit''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 对于代码质量:
' 1) 下面的代码有许多字符串操作,用"&"运算符来把短字符串连接在一起。由于
' 字符串连接是费时的,所以这是一种低效率的写代码方法。无论如何,它是
' 一种非常好维护的写代码方法,并且在这儿使用了这种方法,因为该程序执行
' 大量的磁盘操作,而磁盘操作比连接字符串所需的内存操作要慢得多。
' 记住这是示范代码,而不是产品代码。
'' 2) 使用了 "Option Explicit",因为访问声明过的变量,比访问未声明的变量要
' 稍微快一些。它还能阻止在代码中发生错误,例如,把 DriveTypeCDROM 误拼
' 成了 DriveTypeCDORM '' 3) 为了使代码更可读,该代码中没有错误处理。虽然采取了防范措施,来保证代码
' 在普通情况下没有错误,但文件系统是不可预知的。在产品代码中,使用
' On Error Resume Next  Err 对象来捕获可能发生的错误。
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 一些容易取得的全局变量
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Dim TabStopDim NewLineConst TestDrive ="C"Const TestFilePath ="C:\Test"'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''  Drive.DriveType 返回的常数
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Const DriveTypeRemovable =1Const DriveTypeFixed =2Const DriveTypeNetwork =3Const DriveTypeCDROM =4Const DriveTypeRAMDisk =5'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''  File.Attributes 返回的常数
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Const FileAttrNormal =0Const FileAttrReadOnly =1Const FileAttrHidden =2Const FileAttrSystem =4Const FileAttrVolume =8Const FileAttrDirectory =16Const FileAttrArchive =32 Const FileAttrAlias =64Const FileAttrCompressed =128''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 用来打开文件的常数
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Const OpenFileForReading =1 Const OpenFileForWriting =2 Const OpenFileForAppending =8 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ShowDriveType' 目的: ' 生成一个字符串,来描述给定 Drive 对象的驱动器类型。
' 示范下面的内容
' - Drive.DriveType''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function ShowDriveType(Drive)   Dim S   
   Select Case Drive.DriveType
   Case DriveTypeRemovable
      S ="Removable"
   Case DriveTypeFixed
      S ="Fixed"
   Case DriveTypeNetwork
      S ="Network"
   Case DriveTypeCDROM
      S ="CD-ROM"
   Case DriveTypeRAMDisk
      S ="RAM Disk"
   Case Else
      S ="Unknown"
   End Select   ShowDriveType =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ShowFileAttr' 目的: ' 生成一个字符串,来描述文件或文件夹的属性。
' 示范下面的内容
' - File.Attributes' - Folder.Attributes''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function ShowFileAttr(File) ' File 可以是文件或文件夹   Dim S   Dim Attr
   
   Attr =File.Attributes   If Attr =0 Then
      ShowFileAttr ="Normal"
      Exit Function
   End If   If Attr And FileAttrDirectory Then S =S & "Directory "
   If Attr And FileAttrReadOnly Then S =S & "Read-Only "
   If Attr And FileAttrHidden Then S =S & "Hidden "
   If Attr And FileAttrSystem Then S =S & "System "
   If Attr And FileAttrVolume Then S =S & "Volume "
   If Attr And FileAttrArchive Then S =S & "Archive "
   If Attr And FileAttrAlias Then S =S & "Alias "
   If Attr And FileAttrCompressed Then S =S & "Compressed "   ShowFileAttr =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateDriveInformation' 目的: ' 生成一个字符串,来描述可用驱动器的当前状态。
' 示范下面的内容
' - FileSystemObject.Drives ' - Iterating the Drives collection' - Drives.Count' - Drive.AvailableSpace' - Drive.DriveLetter' - Drive.DriveType' - Drive.FileSystem' - Drive.FreeSpace' - Drive.IsReady' - Drive.Path' - Drive.SerialNumber' - Drive.ShareName' - Drive.TotalSize' - Drive.VolumeName''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function GenerateDriveInformation(FSO)   Dim Drives   Dim Drive
   Dim S   Set Drives =FSO.Drives
   S ="Number of drives:" & TabStop & Drives.Count & NewLine & NewLine   ' 构造报告的第一行。
   S =S & String(2, TabStop) & "Drive" 
   S =S & String(3, TabStop) & "File" 
   S =S & TabStop & "Total"
   S =S & TabStop & "Free"
   S =S & TabStop & "Available" 
   S =S & TabStop & "Serial" & NewLine   ' 构造报告的第二行。
   S =S & "Letter"
   S =S & TabStop & "Path"
   S =S & TabStop & "Type"
   S =S & TabStop & "Ready?"
   S =S & TabStop & "Name"
   S =S & TabStop & "System"
   S =S & TabStop & "Space"
   S =S & TabStop & "Space"
   S =S & TabStop & "Space"
   S =S & TabStop & "Number" & NewLine      ' 分隔行。
   S =S & String(105, "-") & NewLine   For Each Drive In Drives
      S =S & Drive.DriveLetter
      S =S & TabStop & Drive.Path
      S =S & TabStop & ShowDriveType(Drive)
      S =S & TabStop & Drive.IsReady      If Drive.IsReady Then
         If DriveTypeNetwork =Drive.DriveType Then
            S =S & TabStop & Drive.ShareName 
         Else
            S =S & TabStop & Drive.VolumeName 
         End If 
         S =S & TabStop & Drive.FileSystem
         S =S & TabStop & Drive.TotalSize
         S =S & TabStop & Drive.FreeSpace
         S =S & TabStop & Drive.AvailableSpace
         S =S & TabStop & Hex(Drive.SerialNumber)
      End If      S =S & NewLine   Next    GenerateDriveInformation =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateFileInformation' 目的: ' 生成一个字符串,来描述文件的当前状态。
' 示范下面的内容
' - File.Path' - File.Name' - File.Type' - File.DateCreated' - File.DateLastAccessed' - File.DateLastModified' - File.Size''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function GenerateFileInformation(File)   Dim S   S =NewLine & "Path:" & TabStop & File.Path   S =S & NewLine & "Name:" & TabStop & File.Name
   S =S & NewLine & "Type:" & TabStop & File.Type
   S =S & NewLine & "Attribs:" & TabStop & ShowFileAttr(File)
   S =S & NewLine & "Created:" & TabStop & File.DateCreated
   S =S & NewLine & "Accessed:" & TabStop & File.DateLastAccessed
   S =S & NewLine & "Modified:" & TabStop & File.DateLastModified
   S =S & NewLine & "Size" & TabStop & File.Size & NewLine   GenerateFileInformation =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateFolderInformation' 目的: ' 生成一个字符串,来描述文件夹的当前状态。
' 示范下面的内容
' - Folder.Path' - Folder.Name' - Folder.DateCreated' - Folder.DateLastAccessed' - Folder.DateLastModified' - Folder.Size''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function GenerateFolderInformation(Folder)   Dim S   S ="Path:" & TabStop & Folder.Path   S =S & NewLine & "Name:" & TabStop & Folder.Name
   S =S & NewLine & "Attribs:" & TabStop & ShowFileAttr(Folder)
   S =S & NewLine & "Created:" & TabStop & Folder.DateCreated
   S =S & NewLine & "Accessed:" & TabStop & Folder.DateLastAccessed
   S =S & NewLine & "Modified:" & TabStop & Folder.DateLastModified
   S =S & NewLine & "Size:" & TabStop & Folder.Size & NewLine   GenerateFolderInformation =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateAllFolderInformation' 目的: ' 生成一个字符串,来描述一个文件夹和所有文件及子文件夹的当前状态。
' 示范下面的内容
' - Folder.Path' - Folder.SubFolders' - Folders.Count''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function GenerateAllFolderInformation(Folder)   Dim S   Dim SubFolders
   Dim SubFolder
   Dim Files
   Dim File   S ="Folder:" & TabStop & Folder.Path & NewLine & NewLine
   Set Files =Folder.Files   If 1 =Files.Count Then
      S =S & "There is 1 file" & NewLine
   Else
      S =S & "There are " & Files.Count & " files" & NewLine
   End If   If Files.Count <> 0 Then
      For Each File In Files
         S =S & GenerateFileInformation(File)
      Next
   End If   Set SubFolders =Folder.SubFolders   If 1 =SubFolders.Count Then
      S =S & NewLine & "There is 1 sub folder" & NewLine & NewLine
   Else
      S =S & NewLine & "There are " & SubFolders.Count & " sub folders" & NewLine & NewLine
   End If   If SubFolders.Count <> 0 Then
      For Each SubFolder In SubFolders
         S =S & GenerateFolderInformation(SubFolder)
      Next
      S =S & NewLine
      For Each SubFolder In SubFolders
         S =S & GenerateAllFolderInformation(SubFolder)
      Next
   End If   GenerateAllFolderInformation =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateTestInformation' 目的: ' 生成一个字符串,来描述 C:\Test 文件夹和所有文件及子文件夹的当前状态。
' 示范下面的内容
' - FileSystemObject.DriveExists' - FileSystemObject.FolderExists' - FileSystemObject.GetFolder''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function GenerateTestInformation(FSO)   Dim TestFolder   Dim S   If Not FSO.DriveExists(TestDrive) Then Exit Function
   If Not FSO.FolderExists(TestFilePath) Then Exit Function   Set TestFolder =FSO.GetFolder(TestFilePath)   GenerateTestInformation =GenerateAllFolderInformation(TestFolder) End Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' DeleteTestDirectory' 目的: ' 清理 test 目录。
' 示范下面的内容
' - FileSystemObject.GetFolder' - FileSystemObject.DeleteFile' - FileSystemObject.DeleteFolder' - Folder.Delete' - File.Delete''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Sub DeleteTestDirectory(FSO)   Dim TestFolder   Dim SubFolder
   Dim File
   
   ' 有两种方法可用来删除文件:   FSO.DeleteFile(TestFilePath & "\Beatles\OctopusGarden.txt")   Set File =FSO.GetFile(TestFilePath & "\Beatles\BathroomWindow.txt")
   File.Delete      ' 有两种方法可用来删除文件夹:
   FSO.DeleteFolder(TestFilePath & "\Beatles")
   FSO.DeleteFile(TestFilePath & "\ReadMe.txt")
   Set TestFolder =FSO.GetFolder(TestFilePath)
   TestFolder.DeleteEnd Sub''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' CreateLyrics' 目的: ' 在文件夹中创建两个文本文件。
' 示范下面的内容
' - FileSystemObject.CreateTextFile' - TextStream.WriteLine' - TextStream.Write' - TextStream.WriteBlankLines' - TextStream.Close''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Sub CreateLyrics(Folder)   Dim TextStream
      Set TextStream =Folder.CreateTextFile("OctopusGarden.txt")
   
   TextStream.Write("Octopus' Garden ") ' 请注意,该语句不添加换行到文件中。
   TextStream.WriteLine("(by Ringo Starr)")
   TextStream.WriteBlankLines(1)
   TextStream.WriteLine("I'd like to be under the sea in an octopus' garden in the shade,")
   TextStream.WriteLine("He'd let us in, knows where we've been -- in his octopus' garden in the shade.")
   TextStream.WriteBlankLines(2)
   
   TextStream.Close   Set TextStream =Folder.CreateTextFile("BathroomWindow.txt")
   TextStream.WriteLine("She Came In Through The Bathroom Window (by Lennon/McCartney)")
   TextStream.WriteLine("")
   TextStream.WriteLine("She came in through the bathroom window protected by a silver spoon")
   TextStream.WriteLine("But now she sucks her thumb and wanders by the banks of her own lagoon")
   TextStream.WriteBlankLines(2)
   TextStream.CloseEnd Sub''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GetLyrics' 目的: ' 显示 lyrics 文件的内容。
' 示范下面的内容
' - FileSystemObject.OpenTextFile' - FileSystemObject.GetFile' - TextStream.ReadAll' - TextStream.Close' - File.OpenAsTextStream' - TextStream.AtEndOfStream' - TextStream.ReadLine''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function GetLyrics(FSO)   Dim TextStream   Dim S
   Dim File   ' 有多种方法可用来打开一个文本文件,和多种方法来从文件读取数据。
   ' 这儿用了两种方法来打开文件和读取文件:   Set TextStream =FSO.OpenTextFile(TestFilePath & "\Beatles\OctopusGarden.txt", OpenFileForReading)
   
   S =TextStream.ReadAll & NewLine & NewLine
   TextStream.Close   Set File =FSO.GetFile(TestFilePath & "\Beatles\BathroomWindow.txt")
   Set TextStream =File.OpenAsTextStream(OpenFileForReading)
   Do    While Not TextStream.AtEndOfStream
      S =S & TextStream.ReadLine & NewLine
   Loop
   TextStream.Close   GetLyrics =S
   
End Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' BuildTestDirectory' 目的: ' 创建一个目录分层结构来示范 FileSystemObject' 以这样的次序来创建分层结构:
' C:\Test' C:\Test\ReadMe.txt' C:\Test\Beatles' C:\Test\Beatles\OctopusGarden.txt' C:\Test\Beatles\BathroomWindow.txt' 示范下面的内容
' - FileSystemObject.DriveExists' - FileSystemObject.FolderExists' - FileSystemObject.CreateFolder' - FileSystemObject.CreateTextFile' - Folders.Add' - Folder.CreateTextFile' - TextStream.WriteLine' - TextStream.Close''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Function BuildTestDirectory(FSO)   Dim TestFolder   Dim SubFolders
   Dim SubFolder
   Dim TextStream
   ' 排除(a)驱动器不存在,或(b)要创建的目录已经存在的情况。   If Not FSO.DriveExists(TestDrive) Then
      BuildTestDirectory =False
      Exit Function
   End If   If FSO.FolderExists(TestFilePath) Then
      BuildTestDirectory =False
      Exit Function
   End If   Set TestFolder =FSO.CreateFolder(TestFilePath)   Set TextStream =FSO.CreateTextFile(TestFilePath & "\ReadMe.txt")
   TextStream.WriteLine("My song lyrics collection")
   TextStream.Close   Set SubFolders =TestFolder.SubFolders
   Set SubFolder =SubFolders.Add("Beatles")
   CreateLyrics SubFolder   
   BuildTestDirectory =TrueEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' 主程序' 首先,它创建一个 test 目录,以及一些子文件夹和文件。 ' 然后,它转储有关可用磁盘驱动器和 test 目录的某些信息,
' 最后,清除 test 目录及其所有内容。
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Sub Main   Dim FSO   ' 设立全局变量。
   TabStop =Chr(9)
   NewLine =Chr(10)
   
   Set FSO =CreateObject("Scripting.FileSystemObject")   If Not BuildTestDirectory(FSO) Then 
      Print "Test directory already exists or cannot be created. Cannot continue."
      Exit Sub
   End If   Print GenerateDriveInformation(FSO) & NewLine & NewLine
   Print GenerateTestInformation(FSO) & NewLine & NewLine
   Print GetLyrics(FSO) & NewLine & NewLine
   DeleteTestDirectory(FSO)End Sub
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