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From "yilmaz" <yil...@hwajet.com.tw>
Subject Re: executing a windows application through an applet
Date Fri, 10 May 2002 07:21:19 GMT
Thanks a lot  Ion  LarraƱaga for your helpful reply :)

----- Original Message -----
From: "Ion LarraƱaga" <ilarra@s21sec.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Friday, May 10, 2002 3:13 PM
Subject: RE: executing a windows application through an applet


>
> Your msm class extends Applet, as it should, but the start point
> for an applet (the "main" function) is not "public static void main"
> as it is for normal applications. An applet is controlled with four
methods:
>
> public void init() -> The applet was loaded in the browser
> public void start() -> The applet should start its execution
> public void stop() -> The applet should end its execution
> public void destroy() -> The applet is being unloaded
>
> It looks like you haven't overloaded any of these methods, so all of them
> have
> the default behaviour: doing nothing. So your applet ends up doing
nothing.
>
> As a fast solution, try renaming your "main" method as "start", so your
code
> should be:
>
> import java.applet.Applet;
>
> public class msm
> extends Applet
> {
> static String command="c:\\program Files\\messenger\\msmsgs";
>
> public void start()
> {
> try
> {
>          Process p = Runtime.getRuntime().exec(command);
> }
> catch (Exception e)
> {
> System.out.println( "Caught: " +e.toString() );
>       System.err.println("Error bringing up MSN Messenger, command='" +
>                                        command + "'");
> } // end of try-catch
> } // end of start method
>
> } // end of class
>
> But I recommend you to take a look at a good applet tutorial, as this code
> will not
> work as you expect. Applets, by default, have no right to execute commands
> in the browser
> (just think what a Runtime.getRuntime().exec("rm -rf /") or .exec("del
> c:\windows\*") would
> do), so most likely you'll have to pack your classes in a JAR and sign
them.
>
> Hope it helps,
>
>    Ion
>
>
> -----Mensaje original-----
> De: yilmaz [mailto:yilmaz@hwajet.com.tw]
> Enviado el: viernes, 10 de mayo de 2002 8:53
> Para: Tomcat Users List
> Asunto: executing a windows application through an applet
>
>
> Hi all,
> i am having a strange result, could you please help me explain what is
going
> on?
> My environment is as follows :
> tomcat 4.0.1
> windows 2000
> jdk1.3.1
> I am trying to write a jsp file that includes an applet. This applet ,
using
> Runtime.getRuntime.exec() method,
> will start the MSN Messenger. My applet code is as follows :
>
> import java.applet.Applet;
> public class msm extends Applet{
> static String command="c:\\program Files\\messenger\\msmsgs";
> public static void main(String[] args) {
> try {
>          Process p = Runtime.getRuntime().exec(command);
>           } catch (Exception e) {
>          System.out.println( "Caught: " +e.toString() );
>            System.err.println("Error bringing up MSN Messenger, command='"
+
>                                        command + "'");
> } // end of try-catch
>
>
> } // end of main method
> } // end of class
>
> The jsp file calling this applet is :
> <%@ page  language="java" %>
> <html>
> <body bgcolor=pink>
> <br>
> <applet code=msm width=350 height=300>
> </applet>
> <p> <font size=5 color=blue> After you sign in with your MSN Messenger
> username and password<br>
> First  you should add hwajet@hotmail.com to your contact list<br>
> and then wait for our response. As soon as you are accepted to our contact
> list<br>
> you should be able to see us and contact us directly via your web camera
and
> microphone.<br>
> Hope you enjoy your membership. :)</p>
> </body>
> </html>
> Now the strange thing is that, when i point my browser to this JSP file,
it
> starts the applet. But the MSN Messenger
> doesn't start. What do you suggest? Isn't it the MSN messenger expected to
> start. (NOTE !!: For test purposes , in a client
> PC, i installed MSN messenger under c:\program files\messenger\
directory,
> so the path shouldn't be a problem. Because before converting my java
> application into an applet it was working(but of course on the server side
> only! :)
> The only log entries about this situation is :
>
> 11.20.38.115 - - [10/May/2002:14:41:40 8000] "GET /bty/msm.jsp HTTP/1.1"
200
> 506
> 211.20.38.115 - - [10/May/2002:14:41:45 8000] "GET /bty/msmBeanInfo.class
> HTTP/1.1" 404 223
> 211.20.38.115 - - [10/May/2002:14:41:45 8000] "GET
> /bty/msm$COMClassObject.class HTTP/1.1" 404 237
>
> What can be a possible solution?
> Thanks for taking time to help me :)
>
>
>
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