jni-test.cpp

jni-test.cpp (text/plain), 909 bytes, created by Alon Bar-Lev (RETIRED) on 2007-04-09 14:45:55 UTC

#include <cstdlib>
#include <cstdio>
#include <string.h>
#include <jni.h>

int main () {
	JavaVM *jvm;
	JNIEnv *env;
	JDK1_1InitArgs vm_args;
	memset (&vm_args, 0, sizeof (vm_args));
	vm_args.version = JNI_VERSION_1_4;
	JNI_GetDefaultJavaVMInitArgs (&vm_args);
	if (JNI_CreateJavaVM (&jvm, (void **)&env, &vm_args) != 0) {
		fprintf (stderr, "Cannot initialize jvm\n");
		exit (1);
	}
	jclass clsSystem = env->FindClass("java/lang/System");
	jclass clsPrintStream = env->FindClass("java/io/PrintStream");
	jfieldID midOut = env->GetStaticFieldID(clsSystem, "out", "Ljava/io/PrintStream;");
	jobject objOut = env->GetStaticObjectField(clsSystem, midOut);
	jmethodID midPrintln = env->GetMethodID(clsPrintStream, "println", "(Ljava/lang/String;)V");
	jstring msg = env->NewStringUTF("Hello world!"); 
	env->CallVoidMethod (objOut, midPrintln, msg);
			         
	jvm->DestroyJavaVM();

	exit (0);
	return 0;
}