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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。

　　把 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 Sub
Main
　　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 x
End Sub
Main
下面就是示例代码：

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' FileSystemObject 示例代码
'Copyright 1998 Microsoft Corporation。保留所有权利。
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'''OptionExplicit''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''
' 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 和 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 TabStop
Dim NewLineConst TestDrive = "C"
Const TestFilePath = "C:\Test"'''''''''''''''''''''''''''''''''''''''''
'''''''''''''''''''''''''''''''
' 由 Drive.DriveType 返回的常数
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Const DriveTypeRemovable = 1
Const DriveTypeFixed = 2
Const DriveTypeNetwork = 3
Const DriveTypeCDROM = 4
Const DriveTypeRAMDisk = 5''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''
' 由 File.Attributes 返回的常数
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Const FileAttrNormal = 0
Const FileAttrReadOnly = 1
Const FileAttrHidden = 2
Const FileAttrSystem = 4
Const FileAttrVolume = 8
Const FileAttrDirectory = 16
Const FileAttrArchive = 32
Const FileAttrAlias = 64
Const 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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