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how launch a java prog. with a c prog?

Posted on 1998-03-17
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Last Modified: 2010-04-16
I want to know how to write a c,c++ program that will launch a java program.

Something like this:

public class Hello{
     public static void main(String[] args) {
        System.out.println("Hello world");
}
}

This gives me Hello.class when compiled.

Now if I do this:

#include <stdlib.h>

void print(void)
{
 printf("java Hello");
}

void main(void)
{
 print();
}

  I get a c program called Hello.exe

When I run Hello.exe it prints to screen:  java Hello  

This obviously doesn't invoke the jre.

Is there a way to do this?


thanks,

Mike Rutledge

0
Comment
Question by:rutledgj
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4 Comments
 
LVL 6

Expert Comment

by:jpk041897
ID: 1233630
There are several ways you can do this.

The simples is to have your C++ code call:

(a) Under MS Windows
   WinExec("JAVA Hello.class");

(b) Under Unix or DOS

    Exec("Java Hello.class")
or
    Spawn("Java Hello.class");

In practice, for all but the simplest apps, you would be better of if yo created a thread (fork under Unix) that makes the actual call to the Java app.

Additionaly, under MS Windows, you might want to consider creating a .PIF file (copy the Start | Programs | MS Dos Prompt PIF file ) and edit it to contain the call to your Java app.
0
 

Author Comment

by:rutledgj
ID: 1233631
Unless there is more code than you are telling me this doesn't work: Exec("Java Hello.class");
When substituted for the printf statement. I get a linking error about no extern linkage?
I'm trying to do this under dos by the way.

Any other suggestions?
0
 

Accepted Solution

by:
PEW earned 50 total points
ID: 1233632
Try this :

#include <stdlib.h>
void main(void)
{
  system ( "Java Hello.class");
}


0
 

Author Comment

by:rutledgj
ID: 1233633
this worked fine

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