Compiling C code from a Java program

Question

I am trying the following code to compile an external C program with a Java program

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public static void main(String[] args){
    try{
        Runtime rt=Runtime.getRuntime();
        Process pr=rt.exec("cmd /c PATH=%PATH%;c:\\TC\\BIN");
        pr=rt.exec("cmd /c c:\\TC\\BIN\\TCC.exe c:\\TC\\EXAMPLE.c");
        pr=rt.exec("c:\\TC\\EXAMPLE.exe");
        BufferedReader input=new BufferedReader(new InputStreamReader(pr.getInputStream()));
        String line=null;

        while((line=input.readLine())!=null){
            System.out.println(line);
        }
        int exitVal=pr.waitFor();
        System.out.println("exited with error code "+exitVal);
    }
    catch(Exception e){
        System.out.println(e.toString());
        //e.printStackTrace();
    }
}
}

but I am getting:

java.io.IOException: Cannot run program "c:\TC\EXAMPLE.exe": CreateProcess error=2, The system cannot find the file specified

The compilation process is not working, so what else can I do to compile my C code?

JVXR · Accepted Answer · 2012-09-09 16:51:54Z

3

Please use the Processbuilder API for this, The documentation has an example of how to use the various flags.

answered Sep 9, 2012 at 16:51

JVXR

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Comments

JTMon · Accepted Answer · 2012-09-09 16:50:09Z

1

I think that you are calling the compiled program before it had the chance to be generated. You should wait on the call:

pr=rt.exec("cmd /c c:\\TC\\BIN\\TCC.exe c:\\TC\\EXAMPLE.c");

To finish before you try calling the compiled output.

answered Sep 9, 2012 at 16:50

JTMon

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2 Comments

user1617085 Over a year ago

so do i need to use some wait command to make the same program able to compile and execute the code?

JTMon Over a year ago

You can just call rt.waitFor() It will wait for the process to end and gives you the exit value of the thread.

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