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7.15.10 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.
 

Syntax

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

Arguments

object
The name of a File object. Required.
iomode
Indicates input/output mode. Can be one of three constants: ForReading, ForWriting, or ForAppending. Optional.
format
One of three Tristate values used to indicate the format of the opened file. If omitted, the file is opened as ASCII. Optional.

Settings

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.
 

Remarks

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 ForReading = 1, ForWriting = 2, ForAppending = 3;

var TristateUseDefault = -2, TristateTrue = -1, TristateFalse = 0;

var fs, f, ts, s;

fs = new ActiveXObject("Scripting.FileSystemObject");

fs.CreateTextFile( "test1.txt" ); // Create a file

f = fs.GetFile("test1.txt");

ts = f.OpenAsTextStream(ForWriting, TristateUseDefault);

ts.Write( "Hello World" );

ts.Close( );

ts = f.OpenAsTextStream(ForReading, TristateUseDefault);

s = ts.ReadLine( );

ts.Close( );

Response.Write(s);

}


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