Copying text from one file to another using Javascript

Question

I wrote a script (.js) which should copy all text from one file to another, but it doesn't work (i run it on hard disc):

var fso = new ActiveXObject("Scripting.FileSystemObject");
var myInputTextStream = fso.OpenTextFile("C:\\FILE\\back_log.log", 1, true);
var log = "C:\\Temp\\26_04_2012_16_22_49\\ext.txt";     
    var myOutputTextStream = fso.OpenTextFile(log, 8, true);
    while(myInputTextStream.AtEndOfStream)
        {
      myOutputTextStream.Write(myInputTextStream.ReadAll());
    }
      //myInputTextStream.Close();
      //myOutputTextStream.Close(); 
    WScript.Echo("FINISH!!!");

Could anybody coorrect me (or code=))? Thanks a lot.

This is something that should normally be handled server side. — Event_Horizon, Apr 26 '12 at 13:27
Why not simply use a batch one-liner for this? `copy C:\Temp\26_04_2012_16_22_49\ext.txt+C:\FILE\back_log.log C:\Temp\26_04_2012_16_22_49\ext.txt` or `type C:\FILE\back_log.log >> C:\Temp\26_04_2012_16_22_49\ext.txt` — Helen, Apr 26 '12 at 14:02
@Event_Horizon: The OP means JScript used in Windows Script Host (similar to VBScript, PowerShell or batch files), not JavaScript in browsers. — Helen, Apr 26 '12 at 14:46
Interesting, did not know you could do batch file stuff with js. — Event_Horizon, Apr 26 '12 at 15:28

Teemu · Accepted Answer · 2012-04-26T18:17:11.507

1

myInputTextStream.AtEndOfStream is false until reading reaches the EOF. Hence your while-loop is never executed.

If you use ReadAll(), you don't need the while-loop at all.

You should also never comment out your Close()-methods, you may get troubles, especially when using portable memory devices like SDI-cards etc.

edited Apr 26 '12 at 18:17

answered Apr 26 '12 at 13:30

Teemu

22,918
7
53
106

score 0 · Answer 2 · answered Apr 26 '12 at 13:32

You can copy a file like this:

var fso, f;
fso = new ActiveXObject("Scripting.FileSystemObject");
f = fso.CreateTextFile("c:\\testfile.txt", true);
f.WriteLine("This is a test.");
f.Close();
f = fso.GetFile("c:\\testfile.txt");
f.Copy("c:\\windows\\desktop\\test2.txt");

(This creates a file and then copies it, so just use the useful part, which is contained in the last 2 lines.)

Excerpt taken from here: http://msdn.microsoft.com/en-us/library/6973t06a%28v=VS.85%29.aspx

score 0 · Answer 3 · answered Sep 11 '13 at 11:37

0

since javascript cannot access the local "C" drive, not sure where you would use this. SInce you will be running this locally on your machine, why not just use a dos command, vbscript or wscript? javascript is overkill.

answered Sep 11 '13 at 11:37

Clem

69
1
8

Copying text from one file to another using Javascript

3 Answers3