Microsoft® Visual Basic® Scripting Edition
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Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.
The OpenAsTextStream method syntax has these parts:
Part Description object Required. Always the name of a File object. iomode Optional. Indicates input/output mode. Can be one of three constants: ForReading, ForWriting, or ForAppending. format Optional. One of three Tristate values used to indicate the format of the opened file. If omitted, the file is opened as ASCII.
The iomode argument can have any of the following settings:
The format argument can have any of the following settings:
Constant Value Description ForReading 1 Open a file for reading only. You can't write to this file. ForWriting 2 Open a file for writing. If a file with the same name exists, its previous contents are overwritten. ForAppending 8 Open a file and write to the end of the file.
Constant Value Description TristateUseDefault -2 Opens the file using the system default. TristateTrue -1 Opens the file as Unicode. TristateFalse 0 Opens the file as ASCII.
The OpenAsTextStream method provides the same functionality as the OpenTextFile method of the FileSystemObject. In addition, the OpenAsTextStream method can be used to write to a file.
The following code illustrates the use of the OpenAsTextStream method:Sub TextStreamTest Const ForReading = 1, ForWriting = 2, ForAppending = 3 Const TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0 Dim fs, f, ts, s Set fs = CreateObject("Scripting.FileSystemObject") fs.CreateTextFile "test1.txt" 'Create a file Set f = fs.GetFile("test1.txt") Set ts = f.OpenAsTextStream(ForWriting, TristateUseDefault) ts.Write "Hello World" ts.Close Set ts = f.OpenAsTextStream(ForReading, TristateUseDefault) s = ts.ReadLine MsgBox s ts.Close End Sub