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：

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' FileSystemObject 示例代码

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'''OptionExplicit''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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。

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' 一些容易取得的全局变量

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Dim TabStop

Dim NewLineConst TestDrive = "C"

Const TestFilePath = "C:\Test"'''''''''''''''''''''''''''''''''''''''''

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' 由 Drive.DriveType 返回的常数

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Const DriveTypeRemovable = 1

Const DriveTypeFixed = 2

Const DriveTypeNetwork = 3

Const DriveTypeCDROM = 4

Const DriveTypeRAMDisk = 5''''''''''''''''''''''''''''''''''''''''''''

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' 由 File.Attributes 返回的常数

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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''''''''''''''''''''''''''''''''''''''

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' 用来打开文件的常数

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Const OpenFileForReading = 1

Const OpenFileForWriting = 2

Const OpenFileForAppending = 8 '''''''''''''''''''''''''''''''''

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' 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

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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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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

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''''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''''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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

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''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 & "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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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

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'''''''''''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)

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)

S = S & NewLine

For Each SubFolder In SubFolders

S = S & GenerateAllFolderInformation(SubFolder)

End If GenerateAllFolderInformation = SEnd Function'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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

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''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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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

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'''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'''''''''''''''''''''''''''''''''''''''''

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' 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

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'''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

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''''''''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

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''''''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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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' 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。

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'''''''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