Cannot launch simple applications (notepad, java) using Apache and PERL(CGI)

Discussion in 'Perl' started by JDS, May 24, 2004.

  1. JDS

    JDS Guest


    I need to launch an Xwindows application and a java application from a
    web-page running on Apache. The first is an exe file and the second is
    a java file. I have a simple perl script to run these. These run fine
    and the perl script launches the 2 applications (seperately), but I am
    unable to get them to launch from an IE browser running on apache:
    #!c:/perl/bin/perl.exe -w
    use strict;
    use CGI;

    my $q = new CGI;
    print $q->header( "text/plain" );
    system "cmd.exe /c test.bat";
    #system "xapp ";

    test.bat is as follows:
    CALL notepad
    REM CALL java -jar myapp.jar

    1. I can run on windows 2000 from the DOS prompt as follows:
    *xwindows application (xapp.exe)
    c:> xapp
    *Java application.
    c:> test.bat
    This brings up the GUI for my java application.
    2. The perl script above works and launches the applications in a
    seperate window. However, it waits for the application to finish- does
    not spawn a thread and forget about them.
    QUESTION: How can I do that? e.g. the notepad application is launched
    and control returns irrespective of what the user does in the
    application. Currently, the DOS prompt freezes till the user exists
    the application and retruns.

    3. The above script does not run through the web-browser (IE running
    apache). I had expected a seperate window to be launched for notepad,
    or the xapp or the java application, but that does not happen.
    QUESTION: I am lost. It looked like a simple problem and this must
    have been experience before by folks. Would appreciate guidance
    through this.


    JDS, May 24, 2004
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  2. You want to run programs from a browser? Browsers interpret HTML &
    occasionally run Javascript. You may be able to do this from javascript.

    Gregory Toomey, May 24, 2004
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  3. The CGI calls the programs on the server-side, but it looks like the OP
    might be expecting both Apache and IE to be running on the same machine,
    so JavaScript may well be a different but equally effective solution *in
    this case*.

    I'll not discuss how much the concept of a CGI and/or Javascript
    application launching user apps offends my sense of program design, not
    to mention security.

    However, assuming the OP knows what he's doing (difficult as it is), he
    may want to look at using the MS Windows "start" keyword in his system()
    calls. I.e.:

    system("start notepad.exe") && print "error launching notepad";

    This will allow the notepad process to separate (vaguely similar to
    "fork") from the CGI process.

    There are myriad complications that this introduces, however. *IF*
    Apache successfully executes this command and a notepad process does
    indeed start, the notepad will run with the permissions of the Apache
    service, not the logged-in user. I'm not sure what effect this could
    have, and I have no intention of implementing this to find out.

    This is an ugly and offensive hack which, if it works at all, will
    instantly fail if the Apache server and browser run on separate
    machines. There have been hundreds of posts of people attempting what
    you post here and being shocked to find that no Notepad window appears
    on the client machine, but the server's sysadmin finds a Notepad session
    open on his desktop out of nowhere.

    You have been warned, and Google will retain proof of warning

    Tim Hammerquist
    Tim Hammerquist, May 24, 2004
  4. JDS

    JDS Guest

    The applications that need to run are:
    1. An X-windows application.
    2. A Java Application.

    Currently, I do understand the fact that the application that will
    start will run on the server side. I also know that the java
    application will need to be made into an applet and the X-windows
    application will be also replaced by a web-based application. However,
    I want to give a demo show what will eventually happen. In this case,
    there is only one machine involved- the Apache server and the java
    application and the x-windows application currently all run on the
    same windows host.

    What beats me is the fact that I cannot launch an application on the
    same machine- I should be able to run the 4 lines of code to start a
    notepad through the webserver. At this point, it is sufficient for my
    demo purposes to be able to launch an application using Apache and
    Perl as mentioned in my email.

    Hope this explains the motivation.

    JDS, May 24, 2004
  5. JDS


    Nov 11, 2008
    Likes Received:
    I had this same problem, and wanted to be able to launch applications on the server machine using CGI and Apache (for a valid reason I assure you).

    I was using the system() function call in my cgi, but notepad.exe was not showing up on my server's desktop.

    (I am using Windows XP)
    I went to Control Panel -> Administrative tools -> Services
    Right click on Apache2.2 and select Properties.

    Logon Tab.

    Under the "Local System account" radio button , there is a "Allow service to interact with desktop" turn that on, and restart the service, and then the perl system() call will work correctly and notepad.exe will show up in the server desktop.

    (Sorry for resurrecting an old thread, but I hope this might help other Googlers discover the solution)
    ForestHonerkamp, Nov 11, 2008
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