?
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JScript? | 語(yǔ)言參考 |
在本節(jié)描述的示例代碼,提供真實(shí)的例子來(lái)示范在 FileSystemObject 對(duì)象模式中可用的許多功能。該代碼顯示了如何一起使用對(duì)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(qǐng)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(jī)器上運(yùn)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?yàn)樵?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(yùn)行該代碼,則采取以下步驟:
創(chuàng)建一個(gè)標(biāo)準(zhǔn)的 Web 頁(yè),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(yǔ)句從當(dāng)前位置移動(dòng)到 HTML 頁(yè)的最頂部,甚至在 <HTML> 開(kāi)始標(biāo)記前。
把 <%...%> 標(biāo)記放置在 Option Explicit 語(yǔ)句周?chē)?,以保證它在服務(wù)器端運(yùn)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 Sub
Main
前面的代碼增加一個(gè)將在服務(wù)器端運(yùn)行,但在客戶端顯示結(jié)果的打印過(guò)程。要在 Windows Scripting Host 上運(yùn)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:
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' FileSystemObject
示例代碼'Copyright 1998 Microsoft Corporation
。???保留所有權(quán)利。
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Option Explicit
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
對(duì)于代碼質(zhì)量:' 1)
下面的代碼有許多字符串操作,用"&"
運(yùn)算符來(lái)把短字符串連接在一起。由于'
字符串連接是費(fèi)時(shí)的,所以這是一種低效率的寫(xiě)代碼方法。無(wú)論如何,它是'
一種非常好維護(hù)的寫(xiě)代碼方法,并且在這兒使用了這種方法,因?yàn)樵摮绦驁?zhí)行'
大量的磁盤(pán)操作,而磁盤(pán)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?yàn)樵L問(wèn)聲明過(guò)的變量,比訪問(wèn)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(cuò)誤,例如,把DriveTypeCDROM
誤拼'
成了DriveTypeCDORM
。'
' 3)
為了使代碼更可讀,該代碼中沒(méi)有錯(cuò)誤處理。雖然采取了防范措施,來(lái)保證代碼'
在普通情況下沒(méi)有錯(cuò)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(duì)象來(lái)捕獲可能發(fā)生的錯(cuò)誤。''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
一些容易取得的全局變量''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Dim TabStop
Dim NewLine
Const TestDrive = "C"
Const TestFilePath = "C:\Test"
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
由Drive.DriveType
返回的常數(shù)''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Const DriveTypeRemovable = 1
Const DriveTypeFixed = 2
Const DriveTypeNetwork = 3
Const DriveTypeCDROM = 4
Const DriveTypeRAMDisk = 5
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
由File.Attributes
返回的常數(shù)''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
用來(lái)打開(kāi)文件的常數(shù)''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Const OpenFileForReading = 1
Const OpenFileForWriting = 2
Const OpenFileForAppending = 8
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ShowDriveType
'
目的:
'
生成一個(gè)字符串,來(lái)描述給定Drive
對(duì)象的驅(qū)動(dòng)器類(lèi)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 = S
End Function
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' ShowFileAttr
'
目的:
'
生成一個(gè)字符串,來(lái)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 = S
End Function
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateDriveInformation
'
目的:
'
生成一個(gè)字符串,來(lái)描述可用驅(qū)動(dòng)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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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(bào)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(bào)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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateFileInformation
'
目的:
'
生成一個(gè)字符串,來(lái)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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateFolderInformation
'
目的:
'
生成一個(gè)字符串,來(lái)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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateAllFolderInformation
'
目的:
'
生成一個(gè)字符串,來(lái)描述一個(gè)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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' GenerateTestInformation
'
目的:
'
生成一個(gè)字符串,來(lái)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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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(lái)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(lái)刪除文件夾: ???FSO.DeleteFolder(TestFilePath & "\Beatles")
???FSO.DeleteFile(TestFilePath & "\ReadMe.txt")
???Set TestFolder = FSO.GetFolder(TestFilePath)
???TestFolder.Delete
End Sub
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' CreateLyrics
'
目的:
'
在文件夾中創(chuàng)建兩個(gè)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(qǐng)注意,該語(yǔ)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.Close
End 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(lái)打開(kāi)一個(gè)文本文件,和多種方法來(lái)從文件讀取數(shù)據(jù)。 ???'
這兒用了兩種方法來(lái)打開(kāi)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(gè)目錄分層結(jié)構(gòu)來(lái)示范FileSystemObject
。'
以這樣的次序來(lái)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(dòng)器不存在,或(b)
要?jiǎng)?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
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'
主程序'
首先,它創(chuàng)建一個(gè)test
目錄,以及一些子文件夾和文件。
'
然后,它轉(zhuǎn)儲(chǔ)有關(guān)可用磁盤(pán)驅(qū)動(dòng)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