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FileSystemObject 示例代码

Posted on 2005-12-27 23:42  赵国亮  阅读(490)  评论(0)  编辑  收藏  举报

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

  1. 创建一个标准的 Web 页，后缀名为 .asp。
  2. 把下面的示例代码复制到 <BODY>...</BODY> 标记之间的文件中。
  3. 把所有代码包装器到 <%...%> 标记内。
  4. 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。
  5. 把 <%...%> 标记放置在 Option Explicit 语句周围，以保证它在服务器端运行。
  6. 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： 

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'
' FileSystemObject 示例代码
' 
'Copyright 1998  Microsoft Corporation。保留所有权利。 
' 
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Option Explicit

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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 NewLine

Const 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 = S

End 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 = S

End 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 = S

End 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 = S

End Function


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'
' 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
' 
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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
' 
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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.Delete

End 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.Close

End Sub

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'
' 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


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'
' 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 = True

End 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 
		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