VB6中FSO具体应用详解(个人实例版).doc

1、 VB 6.0 中 FSO 对象的具体应用(个人改进版)文前申明:原文为通用版实例代码 ,本菜鸟在每例之后加入一个简单的实例(均验证通过),供有需要的朋友参考.您正在看的 VB 教程是:VB 入门基础认识 VB 的文件系统对象 FSO。 在 VB 编程中经常需要和文件系统打交道，比如获取硬盘的剩余空间、判断文件夹或文件是否存在等。在 VB 推出文件系统对象(File System Object)以前，完成这些功能需要调用 Windows API 函数或者使用一些比较复杂的过程来实现，使编程复杂、可靠性差又容易出错。使用 Windows 提供的的文件系统对象，一切变得简单多了。以下笔者举出一些编

2、程中比较常用的例子，以函数或过程的形式提供给大家，读者可在编程中直接使用，也可以改进后实现更为强大的功能。要应用 FSO 对象，须要引用一个名为 Scripting 的类型库，方法是，执行 VB6.0 的菜单项“工程/引用”，添加引用列表框中的 “Microsoft Scripting Runtime”一项。然后我们在“对象浏览器”中就可以看到 Scripting 类型库下的众多对象及其方法、属性。如果未添加此引用,运行时会出现以下错误 :1.判断光驱的盘符Function GetCDROM() 返回光驱的盘符(字母)Dim Fso As New FileSystemObject 创建 FSO

3、 对象的一个实例Dim FsoDrive As Drive, FsoDrives As Drives 定义驱动器、驱动器集合对象Set FsoDrives = Fso.DrivesFor Each FsoDrive In FsoDrives 遍历所有可用的驱动器If FsoDrive.DriveType = CDRom Then 如果驱动器的类型为 CDromGetCDROM = FsoDrive.DriveLetter 输出其盘符ElseGetCDROM = “End IfNextSet Fso = NothingSet FsoDrive = NothingSet FsoDrives = N

4、othingEnd Function个人改写实例:用以上代码验证电脑硬盘的盘符类型首先建立窗体, 在设计模式把 form 的 autoredraw 设置为 trueSub Form_Load()首先在设计模式把 form 的 autoredraw 设置为 trueDim Fso As New FileSystemObject 创建 FSO 对象的一个实例Dim FsoDrive As Drive, FsoDrives As Drives 定义驱动器、驱动器集合对象Set FsoDrives = Fso.DrivesFor Each FsoDrive In FsoDrives 遍历所有可用的驱动

5、器If FsoDrive.DriveType = CDRom Then 如果驱动器的类型为 CDromGetCDROM = FsoDrive.DriveLetter 输出其盘符Print “CDRom 驱动器是:“Print GetCDROMElseIf FsoDrive.DriveType = Fixed Thengetfixed = FsoDrive.DriveLetterPrint “固定驱动器是:“Print getfixedElseIf FsoDrive.DriveType = Remote Thengetremote = FsoDrive.DriveLetterPrint “网络驱

6、动器是:“Print getremoteElseIf FsoDrive.DriveType = unknown Thengetunknown = FsoDrive.DriveLetterPrint “未知驱动器是:“Print getunknowElseIf FsoDrive.DriveType = RamDisk Thengetramdisk = FsoDrive.DriveLetterPrint “RAM 磁盘是:“Print getramdiskEnd IfNextSet Fso = NothingSet FsoDrive = NothingSet FsoDrives = Nothing

7、End Sub2.判断文件、文件夹是否存在：返回布尔值:True 存在，False 不存在，filername 文件名Function FileExist(filename As String) Dim Fso As New FileSystemObjectIf Fso.FileExists(filename) = True ThenFileExist = TrueElseFileExist = FalseEnd IfSet Fso = NothingEnd Function返回布尔值:True 存在，False 不存在，foldername 文件夹Function FolderExist(f

8、oldername As String)Dim Fso As New FileSystemObjectIf Fso.FolderExists(foldername) = True ThenFolderExist = TrueElseFolderExist = FalseEnd IfSet Fso = NothingEnd Function个人改进实例:验证文件是否存在首先在 form 中建立一个文本框和一个按钮.文本框的 multiline 属性改为 true运行时在文本框中输入文件名,格式为 D:*.jpg,可以用通配符 ,或者固定文件名然后单击按钮来验证文件是否存在Sub Command1

9、_Click()Dim fs As New FileSystemObjectfilename = Text1.TextIf fs.FileExists(filename) ThenText1.Text = “存在“ElseText1.Text = “不存在“End IfEnd SubPrivate Sub Form_Load()Command1.Caption = “验证“End Sub3、获取驱动器参数:返回磁盘总空间大小(单位： M)，Drive = 盘符 A ,C, D .Function AllSpace(Drive As String)Dim Fso As New FileSyste

10、mObject, Drv As DriveSet Drv = Fso.GetDrive(Drive) 得到 Drv 对象的实例If Drv.IsReady Then 如果该驱动器存在 (软驱或光驱里有盘片，硬盘存取正常)AllSpace = Format(Drv.TotalSize / (2 20), “0.00“) 将字节转换为兆ElseAllSpace = 0End IfSet Fso = NothingSet Drv = NothingEnd Function返回磁盘可用空间大小(单位：M)，Drive = 盘符 A ,C, D .Function FreeSpace(drive)Dim

11、 Fso As New FileSystemObject, drv As driveSet drv = Fso.GetDrive(drive)If drv.IsReady ThenFreeSpace = Format(drv.FreeSpace / (2 20), “0.00“)End IfSet Fso = NothingSet Drv = NothingEnd Function获取驱动器文件系统类型， Drive = 盘符 A ,C, D .Function FsType(Drive As String)Dim Fso As New FileSystemObject, Drv As Dri

12、veSet Drv = Fso.GetDrive(Drive)If Drv.IsReady ThenFsType = Drv.FileSystemElseFsType = “End IfSet Fso = NothingSet Drv = NothingEnd Function个人改进实例:验证 c 盘空间和文件类型在窗体中画一个文本框和一个按钮,文本框的 multiline 属性改为 trueSub Command1_Click()Dim fso As New FileSystemObject, drv As DriveSet drv = fso.GetDrive(fso.GetDriveN

13、ame(“c:“) 得到 Drv 对象的实例If drv.IsReady Then 如果该驱动器存在(软驱或光驱里有盘片，硬盘存取正常)AllSpace = Format(drv.TotalSize / (2 20), “0.00“) 将字节转换为兆free = Format(drv.FreeSpace / (2 20), “0.00“)sys = drv.FileSystemElseAllSpace = 0End IfSet fso = NothingSet drv = NothingText1.Text = “C 盘空间为“ & AllSpace & “MB“ & vbCrLf & “c

14、盘空闲空间为“ & free & “MB“Text1.Text = Text1.Text & vbCrLf & “c 盘的文件系统为“ & sysEnd Sub4，获取系统文件夹路径：返回 Windows 文件夹路径Function GetWindir()Dim Fso As New FileSystemObjectGetWindir = Fso.GetSpecialFolder(WindowsFolder)Set Fso = NothingEnd Function返回 WindowsSystem 文件夹路径Function GetWinSysdir()Dim Fso As New FileS

15、ystemObjectGetWinSysdir = Fso.GetSpecialFolder(SystemFolder)Set Fso = NothingEnd Function个人改进实例:获取系统文件夹同上,在窗体中画文本框和按钮,运行后点按钮来验证,别忘了把文本框的 multiline 属性改为truePrivate Sub Command1_Click()Dim fso As New FileSystemObjectgetwin = fso.GetSpecialFolder(windowfolder)getsys = fso.GetSpecialFolder(SystemFolder)

16、Text1.Text = “windows 文件夹为 :“ & getwin & vbCrLf & “system 文件夹为:“ & getsysEnd Sub5，综合运用：一个文件备份通用过程：Filename = 文件名， Drive = 驱动器，Folder = 文件夹(一层)Sub BackupFile(Filename As String, Drive As String, Folder As String)Dim Fso As New FileSystemObject 创建 FSO 对象实例Dim Dest_path As String, Counter As LongCounte

17、r = 0Do While Counter “:“ ThenDrive = Drive & “:“End IfIf Left(Folder, 1) “ ThenFolder = Folder & “End IfDest_path = Drive & FolderIf Not Fso.FolderExists(Dest_path) Then 如果目标文件夹不存在，创建之Fso.CreateFolder Dest_pathEnd IfFso.CopyFile Filename, Dest_path & Fso.GetFileName(Filename), True拷贝，直接覆盖同名文件MsgBox

18、 “ 文件备份完毕。“, vbOKOnlySet Fso = NothingEnd SubPrivate Sub Waitfor(Delay As Single) 延时过程，Delay 单位约为 1 秒Dim StartTime As SingleStartTime = TimerDo Until (Timer - StartTime) DelayLoopEnd Sub个人改进实例一:( 复杂)首先建立窗体,在窗体下输入以下代码:Private Sub Waitfor(Delay As Single) 延时过程，Delay 单位约为 1 秒Dim StartTime As SingleStar

19、tTime = TimerDo Until (Timer - StartTime) DelayLoopEnd SubPrivate Sub Form_Load()Dim Fso As New FileSystemObject 创建 FSO 对象实例Dim Dest_path As String, Counter As LongCounter = 0Do While Counter “:“ ThenDrive = Drive & “:“End IfDepath = InputBox(“请输入目标文件夹( 如 temp):“)If Left(Depath, 1) “ ThenFolder = De

20、path & “End IfDest_path = Drive & FolderMsgBox “目标文件为 “ & Dest_pathIf Not Fso.FolderExists(Dest_path) Then 如果目标文件夹不存在，创建之Fso.CreateFolder (Dest_path)End IfFso.CopyFile sofile, Dest_path, True拷贝，直接覆盖同名文件MsgBox “ 文件备份完毕。“, vbOKOnlySet Fso = NothingEnd Sub个人改进实例二:( 精简)先建立窗体,在窗体下输入以下代码:Private Sub Form_

21、Load()Dim Fso As New FileSystemObject 创建 FSO 对象实例Dim Depath As StringDim sofilesofile = InputBox(“请输入要复制的文件名( 如 C:temp.doc)“)MsgBox “要复制的文件名为“ & sofileDepath = InputBox(“请输入目的文件夹( 如 D:temp):“)MsgBox “目标文件夹为 “ & DepathIf Not Fso.FolderExists(Depath) Then 如果目标文件夹不存在，创建之Fso.CreateFolder (Depath)End IfFso.CopyFile sofile, Depath, True拷贝，直接覆盖同名文件MsgBox “ 文件备份完毕。“, vbOKOnlySet Fso = NothingEnd Sub原作者信息：张庆 Email:zhangking at QQ: 9365822 改进作者信息:Email :