How Can I Integrate Java Functionality into My C Application with JNI?

Embed Java into a C Application: A Comprehensive Guide

Introduction:

Embedding Java within a C application can extend functionality and create seamless integration between technologies.

Objective:

The goal of this tutorial is to guide you in embedding Java into a C application, enabling you to utilize Java classes within your application.

JNI and Its Applications:

JNI (Java Native Interface) provides a framework that allows C and Java to communicate and interact. Traditionally, JNI has been used for standalone Java programs, but it can also be employed to embed a JVM (Java Virtual Machine) within your application.

Embedding a JVM Within Your Application:

To embed a JVM into your C application, follow these key steps:

<code class="cpp">#include <jni.h>

int main() {
  JavaVM *jvm;
  JNIEnv *env;
  JDK1_1InitArgs vm_args;
  vm_args.version = 0x00010001;
  JNI_GetDefaultJavaVMInitArgs(&vm_args);
  JNI_CreateJavaVM(&jvm, &env, &vm_args);

  jclass cls = env->FindClass("Main");
  jmethodID mid = env->GetStaticMethodID(cls, "test", "(I)V");
  env->CallStaticVoidMethod(cls, mid, 100);

  jvm->DestroyJavaVM();
}</code>

This code snippet initializes the JVM, allowing you to interact with Java classes and methods from within your C code.

Example Use Case:

Consider the following Java code that interacts with the Cinema 4D application:

<code class="java">import c4d.documents.*;

class Main {
  public static void main() {
    BaseDocument doc = GetActiveDocument();
    BaseObject op = doc.GetActiveObject();
    if (op != null) {
      op.Remove();
    }
  }
}</code>

By embedding Java, you can seamlessly integrate Cinema 4D functionality into your C application, extending its capabilities.

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