開啟指定的檔案,並傳回可用來讀取、寫入或附加至檔案的 TextStream 物件。
語法
object.OpenTextFile(filename[, iomode[, create]])
引數:
FileSystemObject 的名稱。Format:選擇性。指出開啟檔案的格式。
註:
Format 引數為靜止狀態並保持模擬 VB 指令碼語法。它沒有作用。所有建立的檔案只會是 Unicode 格式。
設定值
iomode 引數可具有下列任一設定值:
表格 11-34 IOMode 引數設定值
| 常數 | 值 | 描述 |
|---|---|---|
| ForReading | 1 | 開啟檔案僅供唯讀。無法寫入此檔案。 |
| ForWriting | 2 | 開啟檔案以供寫入。 |
| ForWriting | 8 | 開啟檔案並寫入檔案結尾。 |
備註
下列程式碼說明 OpenTextFile 方法的用法。
註:
如果建立新檔案,將會以 Unicode 格式建立該檔案。
如果檔案不存在,程式碼將在 ReadMode 中擲出錯誤。
範例 1:
Sub OpenFileForReading()
Const ForReading = 1
Dim fso, tso
Set fso = CreateObject("Scripting.FileSystemObject")
Set tso = fso.OpenTextFile("C:\example1.txt", ForReading)
tso.Close ' Close the file.
Set tso = Nothing
Set fso = Nothing
End Sub
Call OpenFileForReading
'If C:\example1.txt is not present then code will throw an error.
範例 2:
Sub OpenFileForWriting()
Const ForWriting = 2
Dim fso, file
Set fso = CreateObject("Scripting.FileSystemObject")
Set file = fso.OpenTextFile("C:\example2.txt", ForWriting, True)
file.WriteLine("This is written to the file.") ' Writes text to the file.
file.Close ' Close the file.
Set file = Nothing
Set fso = Nothing
End Sub
Call OpenFileForWriting
'Creates C:\example2.txt and writes a line "This is written to the file."
範例 3:
Sub OpenFileForAppending()
Const ForAppending = 8
Dim fso, file
Set fso = CreateObject("Scripting.FileSystemObject")
Set file = fso.OpenTextFile("C:\example2.txt", ForAppending, True)
file.WriteLine("This line is appended.") ' Appends text to the file.
file.Close ' Close the file.
Set file = Nothing
Set fso = Nothing
End Sub
Call OpenFileForAppending
'Creates C:\example2.txt and writes a line "This line is appended.". If file already exists it appends this line.
範例 4:
Sub OpenFileWithCreateOption()
Const ForWriting = 2
Dim fso, file
Set fso = CreateObject("Scripting.FileSystemObject")
Set file = fso.OpenTextFile("C:\example2.txt", ForWriting, True) ' Creates the file if it doesn't exist.
file.WriteLine("New File created and text written.") ' Writes text to the file.
file.Close ' Close the file.
Set file = Nothing
Set fso = Nothing
End Sub
Call OpenFileWithCreateOption
'Overwrites C:\example2.txt and writes a line "New File created and text written.". If file does not exists then it creates it.