| 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 <body>...</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><FONT 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。
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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
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'''''''''''' ' 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 & "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
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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)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'''''''
' 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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''
' 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
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 |