Thursday 27 June 2013

How to embed Java code in C++ code


#include /* where everything is defined */
int main() {
JavaVM *jvm; /* denotes a Java VM */
JNIEnv *env; /* pointer to native method interface */
JDK1_1InitArgs vm_args; /* JDK 1.1 VM initialization arguments */
vm_args.version = 0x00010001; /* New in 1.1.2: VM version */
/* Get the default initialization arguments and set the class
* path */
JNI_GetDefaultJavaVMInitArgs(&vm_args);
vm_args.classpath = ...;
/* load and initialize a Java VM, return a JNI interface
* pointer in env */
JNI_CreateJavaVM(&jvm, &env, &vm_args);
/* invoke the Main.test method using the JNI */
jclass cls = env->FindClass("Main");
jmethodID mid = env->GetStaticMethodID(cls, "test", "(I)V");
env->CallStaticVoidMethod(cls, mid, 100);
/* We could have created an Object and called methods on it instead */
/* We are done. */
jvm->DestroyJavaVM();
}

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