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FileSystemObject 示例代碼

在本節(jié)描述的示例代碼，提供真實的例子來示范在 FileSystemObject 對象模型中可用的許多功能。該代碼顯示了如何一起使用對象模型的所有功能，以及如何在您自己的代碼中有效地使用這些功能。

請注意，由于該代碼是極一般的，所以要使該代碼能夠真正在您的機器上運行，可能需要一些其他代碼和小小的變更。這些改變之所以必要，是因為在 Active Server Pages 和 Windows Scripting Host 之間，為輸入和輸出給用戶采用了不同的方法。

要在 Active Server Pages 上運行該代碼，則采取以下步驟：

創(chuàng)建一個標(biāo)準(zhǔn)的 Web 頁，后綴名為 .asp。

把下面的示例代碼復(fù)制到 <BODY>...</BODY> 標(biāo)記之間的文件中。

把所有代碼包裝器到 <%...%> 標(biāo)記內(nèi)。

把 Option Explicit 語句從當(dāng)前位置移動到 HTML 頁的最頂部，甚至在 <HTML> 開始標(biāo)記前。

把 <%...%> 標(biāo)記放置在 Option Explicit 語句周圍，以保證它在服務(wù)器端運行。

把下面的代碼添加到示例代碼末尾： 

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

前面的代碼增加一個將在服務(wù)器端運行，但在客戶端顯示結(jié)果的打印過程。要在 Windows Scripting Host 上運行該代碼，則把下面的代碼添加到示例代碼的末尾： 

Sub Print(x)
   WScript.Echo x
End Sub
Main

下面就是示例代碼：

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' FileSystemObject 示例代碼
'Copyright 1998  Microsoft Corporation。 保留所有權(quán)利。
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Option Explicit

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' 對于代碼質(zhì)量：
' 1) 下面的代碼有許多字符串操作，用"&"運算符來把短字符串連接在一起。由于
'    字符串連接是費時的，所以這是一種低效率的寫代碼方法。無論如何，它是
'    一種非常好維護的寫代碼方法，并且在這兒使用了這種方法，因為該程序執(zhí)行
'    大量的磁盤操作，而磁盤操作比連接字符串所需的內(nèi)存操作要慢得多。
'    記住這是示范代碼，而不是產(chǎn)品代碼。
'
' 2) 使用了 "Option Explicit"，因為訪問聲明過的變量，比訪問未聲明的變量要
'    稍微快一些。它還能阻止在代碼中發(fā)生錯誤，例如，把 DriveTypeCDROM 誤拼
'    成了 DriveTypeCDORM 。
'
' 3) 為了使代碼更可讀，該代碼中沒有錯誤處理。雖然采取了防范措施，來保證代碼
'    在普通情況下沒有錯誤，但文件系統(tǒng)是不可預(yù)知的。在產(chǎn)品代碼中，使用
'    On Error Resume Next 和 Err 對象來捕獲可能發(fā)生的錯誤。
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' 一些容易取得的全局變量
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Dim TabStop
Dim NewLine

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

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' 由 Drive.DriveType 返回的常數(shù)
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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 返回的常數(shù)
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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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' 用來打開文件的常數(shù)
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Const OpenFileForReading = 1 
Const OpenFileForWriting = 2 
Const OpenFileForAppending = 8 

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' ShowDriveType
' 目的： 
' 生成一個字符串，來描述給定 Drive 對象的驅(qū)動器類型。
' 示范下面的內(nèi)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 = S

End Function

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' ShowFileAttr
' 目的： 
' 生成一個字符串，來描述文件或文件夾的屬性。
' 示范下面的內(nèi)容
' - File.Attributes
' - Folder.Attributes
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Function ShowFileAttr(File) ' File 可以是文件或文件夾

   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 = S

End Function

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' GenerateDriveInformation
' 目的： 
' 生成一個字符串，來描述可用驅(qū)動器的當(dāng)前狀態(tài)。
' 示范下面的內(nèi)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

   ' 構(gòu)造報告的第一行。
   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

   ' 構(gòu)造報告的第二行。
   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 = S

End Function

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' GenerateFileInformation
' 目的： 
' 生成一個字符串，來描述文件的當(dāng)前狀態(tài)。
' 示范下面的內(nèi)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 = S

End Function

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' GenerateFolderInformation
' 目的： 
' 生成一個字符串，來描述文件夾的當(dāng)前狀態(tài)。
' 示范下面的內(nèi)容
'  - Folder.Path
'  - Folder.Name
'  - Folder.DateCreated
'  - Folder.DateLastAccessed
'  - Folder.DateLastModified
'  - Folder.Size
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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 = S

End Function

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' GenerateAllFolderInformation
' 目的： 
' 生成一個字符串，來描述一個文件夾和所有文件及子文件夾的當(dāng)前狀態(tài)。
' 示范下面的內(nèi)容
'  - Folder.Path
'  - Folder.SubFolders
'  - Folders.Count
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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 = S

End Function

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' GenerateTestInformation
' 目的： 
'    生成一個字符串，來描述 C:\Test 文件夾和所有文件及子文件夾的當(dāng)前狀態(tài)。
' 示范下面的內(nèi)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 目錄。
' 示范下面的內(nèi)容
'  - FileSystemObject.GetFolder
'  - FileSystemObject.DeleteFile
'  - FileSystemObject.DeleteFolder
'  - Folder.Delete
'  - File.Delete
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Sub DeleteTestDirectory(FSO)

   Dim TestFolder
   Dim SubFolder
   Dim File
   
   ' 有兩種方法可用來刪除文件：

   FSO.DeleteFile(TestFilePath & "\Beatles\OctopusGarden.txt")

   Set File = FSO.GetFile(TestFilePath & "\Beatles\BathroomWindow.txt")
   File.Delete   

   ' 有兩種方法可用來刪除文件夾：
   FSO.DeleteFolder(TestFilePath & "\Beatles")
   FSO.DeleteFile(TestFilePath & "\ReadMe.txt")
   Set TestFolder = FSO.GetFolder(TestFilePath)
   TestFolder.Delete

End Sub

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' CreateLyrics
' 目的： 
'    在文件夾中創(chuàng)建兩個文本文件。
' 示范下面的內(nèi)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")
   
   ' 請注意這不會將一行添加到文件中。
   TextStream.Write("Octopus' Garden ") 
   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.Close

End Sub

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' GetLyrics
' 目的： 
'    顯示 lyrics 文件的內(nèi)容。
' 示范下面的內(nèi)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

   ' 有多種方法可用來打開一個文本文件，和多種方法來從文件讀取數(shù)據(jù)。
   ' 這兒用了兩種方法來打開文件和讀取文件：

   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

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' BuildTestDirectory
' 目的： 
'    創(chuàng)建一個目錄分層結(jié)構(gòu)來示范 FileSystemObject。
'    以這樣的次序來創(chuàng)建分層結(jié)構(gòu)：
'       C:\Test
'       C:\Test\ReadMe.txt
'       C:\Test\Beatles
'       C:\Test\Beatles\OctopusGarden.txt
'       C:\Test\Beatles\BathroomWindow.txt
' 示范下面的內(nèi)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)驅(qū)動器不存在，
   ' 或(b)要創(chuàng)建的目錄已經(jīng)存在的情況。

   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 = True

End Function

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' 主程序
' 首先，它創(chuàng)建一個 test 目錄，以及一些子文件夾和文件。
' 然后，它轉(zhuǎn)儲有關(guān)可用磁盤驅(qū)動器和 test 目錄的某些信息，
' 最后，清除 test 目錄及其所有內(nèi)容。
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Sub Main

   Dim FSO

   ' 設(shè)立全局變量。
   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