Call gcc.exe with java

Question

Hi there:
I need help. I am trying to write a program that compiles *.c file(s) and capture the compilation result. Here is what I tried:
BufferedReader br = new BufferedReader(new FileReader(srcFile));
fileName = br.readLine();
System.out.println(fileName);
Runtime rt1 = Runtime.getRuntime();
Process proc1 = rt1.exec("cmd /c C:/jdk1.3.1_07/bin/gcc "+fileName); //***here is the problem ***
InputStream inp = proc1.getInputStream();
int charIn1;
while( (charIn1 = inp.read()) != -1 )
System.out.print( (char)charIn1 );
Here GCC should show compilation errors because I planted syntax errors in my test *.c file. But for some reason nothing gets displayed on the screen. Is there a way to know whats going on behind the scene! Or do I need to pursue something else such as JNI instead of directly calling gcc program !
Please help if possible.
-JCodda

Answer 1

Don't invoke gcc throught the 'cmd' command shell; invoke it directly like this --
String gcc= "C:/jdk1.3.1_07/bin/gcc";
Process rt1.exec(new String[] { gcc, filename });
// etc.
[/code
I've used this form of exec() just because 'filename' might contain whitespace which gets tokenzed out and splits up the file name.
kind regards,
Jos