| Visual Basic Scripting Edition | 語言參考 |
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 對象模式中可用的許多功能。該代碼顯示了如何一起使用對象模式的所有功能，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)建一個標準的 Web 頁，后綴名為 .asp。 把下面的示例代碼復(fù)制到 <BODY>...</BODY> 標記之間的文件中。 把所有代碼包裝器到 <%...%> 標記內(nèi)。 把 Option Explicit 語句從當前位置移動到 HTML 頁的最頂部，甚至在 <HTML> 開始標記前。 把 <%...%> 標記放置在 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><FONT FACE=""宋體"" SIZE=""1"">" Response.Write x Response.Write "</FONT></PRE>"End SubMain
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 xEnd SubMain
下面就是示例代碼： ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' FileSystemObject 示例代碼
'Copyright 1998 Microsoft Corporation。 保留所有權(quán)利。 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Option Explicit''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 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。
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 一些容易取得的全局變量
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Dim TabStopDim NewLineConst TestDrive ="C"Const TestFilePath ="C:\Test"''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 由 Drive.DriveType 返回的常數(shù)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Const DriveTypeRemovable =1Const DriveTypeFixed =2Const DriveTypeNetwork =3Const DriveTypeCDROM =4Const DriveTypeRAMDisk =5''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 由 File.Attributes 返回的常數(shù)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Const FileAttrNormal =0Const FileAttrReadOnly =1Const FileAttrHidden =2Const FileAttrSystem =4Const FileAttrVolume =8Const FileAttrDirectory =16Const FileAttrArchive =32 Const FileAttrAlias =64Const FileAttrCompressed =128''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 用來打開文件的常數(shù)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Const OpenFileForReading =1 Const OpenFileForWriting =2 Const OpenFileForAppending =8 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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 =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateDriveInformation' 目的： ' 生成一個字符串，來描述可用驅(qū)動器的當前狀態(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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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 =SEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateFileInformation' 目的： ' 生成一個字符串，來描述文件的當前狀態(tài)。
' 示范下面的內(nèi)容
' - File.Path' - File.Name' - File.Type' - File.DateCreated' - File.DateLastAccessed' - File.DateLastModified' - File.Size''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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： ' 生成一個字符串，來描述文件夾的當前狀態(tài)。
' 示范下面的內(nèi)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： ' 生成一個字符串，來描述一個文件夾和所有文件及子文件夾的當前狀態(tài)。
' 示范下面的內(nèi)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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' 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前狀態(tài)。
' 示范下面的內(nèi)容
' - FileSystemObject.DriveExists' - FileSystemObject.FolderExists' - FileSystemObject.GetFolder''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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 目錄。
' 示范下面的內(nèi)容
' - FileSystemObject.GetFolder' - FileSystemObject.DeleteFile' - FileSystemObject.DeleteFolder' - Folder.Delete' - File.Delete''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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.DeleteEnd Sub''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' 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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''Sub CreateLyrics(Folder) Dim TextStream Set TextStream =Folder.CreateTextFile("OctopusGarden.txt")
TextStream.Write("Octopus' Garden ") ' 請注意，該語句不添加換行到文件中。
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： ' 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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' 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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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 =TrueEnd Function''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' 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。
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''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
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