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FileSystemObject 示例代码

2008-10-29 20:36 351 查看
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。

把所有代码封装到 <%...%> 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：

以下为引用的内容：
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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。

以下为引用的内容：

'

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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

<a name="DeleteFile">

' 有两种方法可用来删除文件：

FSO.DeleteFile(TestFilePath & "BeatlesOctopusGarden.txt")

Set File = FSO.GetFile(TestFilePath & "BeatlesBathroomWindow.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

</a><a name="CreateTextFile">

Set TextStream = Folder.CreateTextFile("OctopusGarden.txt")

</a><a name="WriteToFile">

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)

</a><a name="Close">

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 & "BeatlesOctopusGarden.txt", OpenFileForReading)

</a><a name="ReadFromFile">

S = TextStream.ReadAll & NewLine & NewLine

TextStream.Close

Set File = FSO.GetFile(TestFilePath & "BeatlesBathroomWindow.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:TestReadMe.txt

' C:TestBeatles

' C:TestBeatlesOctopusGarden.txt

' C:TestBeatlesBathroomWindow.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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</a><a name="FolderInfo">

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)

</a><a name="CreateFSO">

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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