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OpenAsTextStream Method

Opens a specified file and returns a TextStream object that can be used to read from, write to, or append to the file.

object.OpenAsTextStream([iomode, [format]]) 


Required. Always the name of a File object.
Optional. Indicates input/output mode. Can be one of three constants: ForReading, ForWriting, or ForAppending.
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:

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.

The format argument can have any of the following settings:

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:

function TextStreamTest( )
   var fso, f, ts, s;
   var ForReading = 1, ForWriting = 2, ForAppending = 8;
   var TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0;
   fso = new ActiveXObject("Scripting.FileSystemObject");
   fso.CreateTextFile( "test1.txt" );           // Create a file.
   f = fso.GetFile("test1.txt");
   ts = f.OpenAsTextStream(ForWriting, TristateUseDefault);
   ts.Write( "Hello World" );
   ts.Close( );
   ts = f.OpenAsTextStream(ForReading, TristateUseDefault);
   s = ts.ReadLine( );
   ts.Close( );
Function TextStreamTest
   Const ForReading = 1, ForWriting = 2, ForAppending = 8
   Const TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0
   Dim fso, f, ts
   Set fso = CreateObject("Scripting.FileSystemObject")
   fso.CreateTextFile "test1.txt"   ' Create a file.
   Set f = fso.GetFile("test1.txt")
   Set ts = f.OpenAsTextStream(ForWriting, TristateUseDefault)
   ts.Write "Hello World"
   Set ts = f.OpenAsTextStream(ForReading, TristateUseDefault)
   TextStreamTest = ts.ReadLine
End Function

file: /Techref/language/asp/vbs/vbscript/jsmthopenastextstream.htm, 4KB, , updated: 2005/8/9 13:38, local time: 2024/6/16 02:15,

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