Append a file using fso.opentextfile command

Posted on 2002-07-25
Last Modified: 2007-12-19
Below is the code for opening a text file to write out the services information.

However, I want to append the details instead of overwriting my text file.
How should I do it? Mode =1 is for reading an input file, mode=2 is for overwriting...

Const Mode= 2
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objTextFile = objFSO.OpenTextFile _
   ("c:\test.txt", Mode , True)
Set colServices =  GetObject("winmgmts:").ExecQuery _
   ("Select * from Win32_Service")
For Each objService in colServices    
   objTextFile.WriteLine(objService.DisplayName & vbTab & _
Question by:MarcusAu
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Expert Comment

ID: 7179079
Here is an example from MSDN. It looks like the modes are constants "ForReading" and "ForAppending". Look at the FileSystemObject under the Scripting library in the Object Browser and you should see. "TristateFalse" opens the file in ASCII mode.

I modified it just a bit so that the variable f was a TextStream. This Code assumes the file is already created.

Sub OpenTextFileTest
    Dim fs as FileSystemObject
    Dim f as TextStream
    Set fs = CreateObject("Scripting.FileSystemObject")
    Set f = fs.OpenTextFile("c:\testfile.txt", ForAppending,TristateFalse)
    f.Write "Hello world!"
End Sub

Author Comment

ID: 7179195
Yeah , I checked it in Technet too. Forappending value is 2. I even ran the sample code.However, the file is overwritten.
LVL 75

Expert Comment

by:Anthony Perkins
ID: 7179323
Actually the syntax for OpenTextFile is:

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

So in order not to overwrite it should be:
Set f = fs.OpenTextFile("c:\testfile.txt", ForAppending, False, TristateFalse)

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LVL 75

Expert Comment

by:Anthony Perkins
ID: 7179324
Or if you just want to keep it simple you can use:
Set f = fs.OpenTextFile("c:\testfile.txt", ForAppending)


Author Comment

ID: 7179360
No I am sorry.It's not working following your way. ForAppending is value 2?
LVL 75

Accepted Solution

Anthony Perkins earned 50 total points
ID: 7179401
ForAppending = 8


Author Comment

ID: 7179410
Yes u r right. U deserve the points. :)
LVL 75

Expert Comment

by:Anthony Perkins
ID: 7179427
Typically here we give an explanation as to why an "A" was not merited.

Here is the code I was about to post as an example:
1. Start a new project
2. Add a reference to Microsoft Scripting Runtime
3. Add a Command button (Command1)
4. Add the following code

Private Sub Command1_Click()
Const TEST_FILE = "c:\test.txt"
Dim fs As Scripting.FileSystemObject
Dim f As Scripting.TextStream

Set fs = New Scripting.FileSystemObject
If Not fs.FileExists(TEST_FILE) Then
   Set f = fs.CreateTextFile(TEST_FILE)
   Set f = fs.OpenTextFile(TEST_FILE, ForAppending)
End If
f.WriteLine CStr(Now())
Set f = Nothing
Set fs = Nothing

End Sub

5. Run it and press the Command button as many times as you wish.  You will notice that it appends to the file.


Expert Comment

ID: 7189442

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