asp(vbs)fso OpenTextFile method parameter description

OpenTextFile is a method in the asp language. It opens the specified file and returns a TextStream object. The file can be read, written or appended through this object.

OpenTextFile is a method in asp language

Opens the specified file and returns a TextStream object through which the file can be read, written, or appended.

object.OpenTextFile(filename[, iomode[, create[, format]]])

1. The method editor opens the specified file and returns a TextStream object, through which the file can be read, written, or appended.

object.OpenTextFile(filename[, iomode[, create[, format]]])

2. Parameter editing object

Required. object should be the name of a FileSystemObject.

filename

Required. A string expression that specifies the file to open.

iomode

Optional. Can be one of three constants: ForReading, ForWriting, or ForAppending.

create

Optional. Boolean value indicating whether to create a new file when the specified filename does not exist. The value is True if a new file is created, False if it is not created. If omitted, no new file is created.

format

Optional. Use one of the three-state values ​​to specify the format in which to open the file. If omitted, the file will be opened in ASCII format.

3. Set and edit the iomode parameter, which can be any of the following settings:

Constant value description

ForReading 1 opens the file read-only. This file cannot be written.

ForWriting 2 Open file for writing

ForAppending 8 opens the file and starts writing from the end of the file.

The format parameter can be any of the following settings:

value description

TristateTrue opens files in Unicode format.

TristateFalse opens the file in ASCII format.

TristateUseDefault Opens the file using system defaults.

4. Instructions Edit The following code illustrates how to use the OpenTextFile method to open a file and append text:

var fs, a, ForAppending;

ForAppending = 8;

fs = new ActiveXObject(Scripting.FileSystemObject);

//Can be one of three constants: ForReading, ForWriting or ForAppending

//They are 1, 2, 8 respectively

a = fs.OpenTextFile(c://testfile.txt, 2, false);

...

a.Close();

Use cases in vbs script

Opens the specified file and returns a TextStream object that can be read, written, or appended to the file.

object.OpenTextFile(filename[,iomode[,create[,format]]])

parameter

object

Required. Should be the name of a FileSystemObject object.

filename

Required. A string expression specifying the name of the file to open.

iomode

Optional. Input/output mode, one of the following three constants: ForReading, ForWriting, or ForAppending.

create

Optional. Boolean value indicating whether a new file can be created when the specified filename does not exist. True to allow creation of new files, False otherwise. The default value is False.

format

Optional. One of three Tristate values ​​indicating the format in which to open the file. If this parameter is omitted, the file is opened in ASCII format.

The iomode parameter can be one of the following settings:

The format parameter can be one of the following settings:

Usage examples:

1. SubOpenTextFileTest
2. ConstForReading=1,ForWriting=2,ForAppending=8
3. Dimfso,f
4. Setfso=CreateObject(Scripting.FileSystemObject)
5. Setf=fso.OpenTextFile(c:/testfile.txt,ForWriting,True)
6. f.Write Hi there!
7. f.Close
8. EndSub
9. CallOpenTextFileTest

A function written by Wulin.com

1. Dimfso
2. Setfso=CreateObject(Scripting.FileSystemObject)
3. setfn2=fso.GetFile(E:/webroot/vevb/index2.htm)
4. flsize2=fn2.size
5. fldate2=fn2.datelastmodified
6. setfn=fso.GetFile(E:/webroot/vevb/index.htm)
7. flsize1=fn.size
8. fldate1=fn.datelastmodified
9. Iffso.FileExists(E:/webroot/vevb/index2.htm)andflsize2>50000andfldate2>fldate1Then
10. 'Determine the size of the file. If the html file is regenerated, you need to determine whether it has been updated and the file cannot be less than 50K
11. fso.getfile(E:/webroot/vevb/index2.htm).copy(E:/webroot/vevb/index.htm)
12. iferr.number=0thenWriteHistory successful&now()&..........,log.txt
13. endif
14. 'Log writing function
15. SubWriteHistory(hisChars,path)
16. ConstForReading=1,ForAppending=8
17. Dimfso,f
18. Setfso=CreateObject(Scripting.FileSystemObject)
19. Setf=fso.OpenTextFile(path,ForAppending,True)
20. f.WriteLinehisChars
21. f.Close
22. EndSub