string->char* [former Re: core dump]

[Martin Aliger]

Hi list again,

> > #include <java/lang/Math.h>
> > int main()
> > {
> >      jint i=java::lang::Math::round((jfloat)2.3);
> >      return 0;
> > }
> 
> This is the main method, so the VM isn't initialized yet.  Also, the Math
> class may not be initialized.  See
> http://gcc.gnu.org/onlinedocs/gcj/Invocation.html for a similar example
> using the CNI invocation interface.

It already works great! Thanks once more.

Now I'm using this code:
-----
int main()
{
	printf("Hello from C\n");

	try {
	
		_Jv_CreateJavaVM(NULL);
		_Jv_AttachCurrentThread(NULL,NULL);
	
		w::main();

		_Jv_DetachCurrentThread();
	} catch (java::lang::Throwable* t)
	{
		jstring clsname=t->getClass()->getName();
		char cbuf[1024];
		int cl=clsname->length();
		if(cl>1024) cl=1024;
		_Jv_GetStringUTFRegion(clsname,0,cl,cbuf);
		cbuf[cl]=0;
		
		jstring jmsg=t->getLocalizedMessage();
		char buf[1024];
		if(jmsg) {
			int l=jmsg->length();
			if(l>1024) l=1024;
			_Jv_GetStringUTFRegion(jmsg,0,l,buf);
			buf[l]=0;
		} else {
			buf[0]=0;
		}
		printf("Java %s exception: %s\n",cbuf,buf);
	}

	return 0;
}
-----

It works, but that conversion from jstring to char* is not very convinient. Is there any (helper) method to do this? Or rather convert into wchar_t or similar (not jchar)? I just want to return error message to C++ caller and it could (should!) not be aware if Java classes.

Regards,
Martin

BTW: good work! GCJ seems to be much more mature that I (and many others) think! AWT library is not main interest of many developers and IMHO it should not be part of gcc itself (rather external library to depend on)



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