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Visual Basic 程式設計

Visual Basic 程式設計. 講師：戴志華 hana@arbor.ee.ntu.edu.tw 國立台灣大學電機工程研究所. 第十一章 檔案存取. DriveList. DriveListBox(cont’d). DriveListBox(cont’d). Private Sub Drive1_Change() Print " 磁碟代碼=" & Drive1.Drive Print "listcount=" & Drive1.ListCount Print "listindex=" & Drive1.ListIndex

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Visual Basic 程式設計

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  1. Visual Basic 程式設計 講師：戴志華 hana@arbor.ee.ntu.edu.tw 國立台灣大學電機工程研究所

  2. 第十一章 檔案存取

  3. DriveList

  4. DriveListBox(cont’d)

  5. DriveListBox(cont’d) Private Sub Drive1_Change() Print "磁碟代碼=" & Drive1.Drive Print "listcount=" & Drive1.ListCount Print "listindex=" & Drive1.ListIndex Print "目前磁碟所在=" & Drive1.List(Drive1.ListIndex) End Sub Private Sub form_click() Drive1.Drive = "c:" End Sub

  6. DirListBox

  7. DirListBox (cont’d)

  8. DirListBox (cont’d) Private Sub Dir1_Change() MsgBox "目前目錄所在:" & Dir1.Path End Sub Private Sub form_click() Cls Print "目前目錄:" & Dir1.Path Print "目前目錄下可選擇目錄個數:" & Dir1.ListCount Print "已選擇目錄位置:" & Dir1.ListIndex Print "已選擇目錄:" & Dir1.List(Dir1.ListIndex) Print "位置0的目錄:" & Dir1.List(0) End Sub

  9. FileListBox

  10. FileListBox(cont’d)

  11. FileListBox(cont’d)

  12. FileListBox(cont’d) Private Sub File1_Click() Form1.Cls Print "目前目錄: " & File1.Path Print "已選擇檔案的檔名: " & File1.FileName Print "目前目錄下可選擇檔案數目:" & File1.ListCount Print "已選擇檔案的位置: " & File1.ListIndex Print "可否重複選擇: " & File1.MultiSelect Print "某個檔案是否有被選: " & File1.Selected(0) Print "pattern(*.* 或 *.txt): " & File1.Pattern Print "已選擇檔案的完整路徑: "; File1.Path + "\" + File1.FileName End Sub Private SubForm_Activate() File1.Path = "c:\temp" End Sub

  13. Exercise:整合

  14. Exercise:整合(cont’d) Private Sub updatePath() Text1.Text = Dir1.Path + File1.FileName End Sub Private Sub Command1_Click() File1.Pattern = Text2.Text End Sub Private Sub Drive1_Change() Dir1.Path = Drive1.Drive End Sub

  15. Exercise:整合(cont’d) Private Sub Dir1_change() File1.Path = Dir1.Path updatePath End Sub Private Sub File1_click() updatePath End Sub

  16. File System Objects • 專案->設定使用參考元件

  17. File System Objects • File System Objects共有五種物件 FileSystemObject File Folder Drive TextStream

  18. FileSystemObject

  19. FileSystemObject(cont’d)

  20. FileSystemObject(cont’d)

  21. FileSystemObject(cont’d) • 產生新的FileSystemObject 語法： Dim 變數名 AsNew FileSystemObject (*Drive, Folder, File, TextStream亦同) • copyFile 語法： CopyFile來源, 目的 [, 覆蓋模式] • 功能: 複製檔案 • 參數說明: • 來源、目的 : 字串 (來源、目的可用*與?) • 覆蓋模式: boolean，預設值為true

  22. FileSystemObject(cont’d) Private Sub form_click() Dim fs As New FileSystemObject fs.CopyFile "c:\autoexec.bat", "c:\test", False End Sub 執行第二次時,會發生 ERROR!

  23. FileSystemObject(cont’d) • copyFolder 語法： CopyFolder 來源, 目的[, 覆蓋模式] • 功能: 複製目錄 • 範例1: 將來源目錄下所有的檔案、目錄，複製到目的目錄 CopyFolder “c:\temp”, “c:\tmp”,false • 範例2: 將來源目錄下某些目錄複製到目的目錄 Copy Folder “c:\temp\a*”, “c:\tmp”,false

  24. FileSystemObject(cont’d) • createFolder 語法： CreateFolder 目錄名 • 功能: 產生新目錄, 若目錄已存在，則發生錯誤 • createTextFile 語法： CreateTextFile 檔名[, 覆蓋模式] • 功能:產生新檔案 • 說明:傳回TextStream

  25. FileSystemObject(cont’d) Private Sub form_click() Dim fs As New FileSystemObject fs.CreateFolder "c:\a" fs.CreateTextFile "c:\a\test" End Sub

  26. FileSystemObject(cont’d) • DeleteFile 語法： DeleteFile 檔名[, force] • 功能:刪除檔案 • 說明: 檔名可包含*與? • 若force=false, 則無法刪除屬性是read only的檔案

  27. FileSystemObject(cont’d) • DeleteFolder 語法： DeleteFolder 目錄名[, force] • 功能:刪除檔案 • 說明:目錄名可包含*與? • 若force=false, 則無法刪除屬性是read only的目錄 • 即使目錄內有檔案也會刪除

  28. FileSystemObject(cont’d) Private Sub Command1_Click() Dim fs As New FileSystemObject fs.DeleteFile File1.Path + "\" + _ File1.FileName File1.Refresh End Sub Private Sub Dir1_Change() File1.Path = Dir1.Path End Sub Private Sub Drive1_Change() Dir1.Path = Drive1.Drive End Sub

  29. FileSystemObject(cont’d) • DriveExists 語法： DriveExists 磁碟機名 • 功能: 檢查該磁碟機是否存在 • 說明: 若CDROM沒有光碟片，也會回傳true • 要用Drive物件的IsReady來偵測 • 範例: dim fs as new filesystemobject rlt= fs.DriveExists(“c:”) • FileExists 檔案名 • FolderExists 目錄名

  30. FileSystemObject(cont’d) • GetAbsolutePathName 語法： GetAbsolutePathName pathspec • 說明: 假設當前目錄為 c:\mydocuments\reports

  31. FileSystemObject(cont’d) • GetDrive 語法： GetDrive 磁碟機名 • 說明:回傳Drive物件 • GetDriveName 語法： GetDriveName 磁碟機名 • GetFile 語法： GetFile 檔案名 • 說明:回傳File物件 • GetFileName 語法： GetFileName 路徑名

  32. FileSystemObject(cont’d) • GetFolder 語法： GetFolder 目錄名 • 說明:回傳Folder物件 • GetParentFolderName 語法： GetParentFolderName 路徑名 • 範例: GetParentFolderName(“c:\a\b\c”) “c:\a\b” • GetTempName 語法： GetTempName

  33. FileSystemObject(cont’d) • MoveFile 語法： MoveFile 來源, 目的 • MoveFolder 語法： MoveFolder 來源, 目的

  34. FileSystemObject(cont’d) • OpenTextFile 語法： OpenTextFile 檔名 [, IO模式 [,create] ] • 說明: • IO模式 • ForReading • ForAppending • Create: 若檔案不存在，是否開新檔案(Boolean) • 傳回TextStream

  35. 練習 • show出檔案所在的磁碟名稱 • show出檔案所在的目錄名稱 • show出暫時的檔名

  36. Private Sub Dir1_Change() File1.Path = Dir1.Path End Sub Private Sub Drive1_Change() Dir1.Path = Drive1.Drive End Sub Private Sub File1_Click() Dim fs As New FileSystemObject Text1.Text = "GetDriveName: " + _ fs.GetDriveName(File1.Path) _ + vbNewLine + _ "GetParentFolderName: " + _ fs.GetParentFolderName(File1.Path) _ + vbNewLine + _ "GetTempName: " + fs.GetTempName() End Sub

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