Running applications

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*[ nsIProcess interface] *[ nsIProcess interface]
-[[Category:Development]]+[[Category:Development|Run programs]] [[Category:Example code|Run programs]]

Revision as of 10:56, 16 January 2005

This page is part of the extension development documentation project.

Ask your questions in MozillaZine Forums. Also try browsing example code.

Note: development documentation is in process of being moved to Mozilla Development Center (MDC).


Runing programs

This page describes how to run other programs from your JavaScript code, using Mozilla XPCOM interfaces.

There are two ways to run external programs. The first is to use nsILocalFile::launch() method, the second is to use nsIProcess interface.


This method has the same effect as if you double clicked the file, so for executable files, it will just run the file without any parameters. It may not be implemented on some platforms, so make sure your this method is implemented on your target platforms. It seems to be implemented on Windows.

For more information on nsIFile/nsILocalFile, see File IO.


The recommended way is to use nsIProcess interface. It is as easy as:

// create an nsILocalFile for the executable
var file = Components.classes[";1"]

// create an nsIProcess
var process = Components.classes[";1"]

// Run the process.
// If first param is true, calling process will be blocked until
// called process terminates. 
// Second and third params are used to pass command-line arguments
// to the process.
var args = ["argument1", "argument2"];, args, args.length);