callbacks.c

初期JAVA学习非常有用的资料。帮助深入了解API。特别是Applet。

#include <stdio.h>
#include <jni.h>
#include "Callbacks.h"

JNIEXPORT void JNICALL 
Java_Callbacks_nativeMethod(JNIEnv *env, jobject obj, jint depth)
{
  jclass cls = (*env)->GetObjectClass(env, obj);
  jmethodID mid = (*env)->GetMethodID(env, cls, "callback", "(I)V");
  if (mid == 0) {
    return;
  }
  printf("In C, depth = %d, about to enter Java\n", depth);
  (*env)->CallVoidMethod(env, obj, mid, depth);
  printf("In C, depth = %d, back from Java\n", depth);
}