c++ 调用java

[TODO]

通过JNI 调用 java 的jar， 主要步骤

• 获取 class
  jclass c = (*env)->FindClass(env,“com/camera/webcam/Test”);

• 获取 method
  jfieldID width_id = (*env)->GetFieldID(env, c, “width”, “I”);

遍历hashmap

将test 代码打成一个jar

• https://stackoverflow.com/questions/10307652/how-to-include-test-classes-in-jar-created-by-maven-shade-plugin

JNI 多线程

The JNI interface pointer (JNIEnv) is valid only in the current thread. Should another thread need to access the Java VM, it must first call AttachCurrentThread() to attach itself to the VM and obtain a JNI interface pointer.

ref: http://docs.oracle.com/javase/1.5.0/docs/guide/jni/spec/invocation.html

ref

https://blog.youkuaiyun.com/plx0303sunny/article/details/103457709

• JNI常见用法
• Jenv, jclass, jobject基础
• jni env 数据类型, 函数签名
• jni中资源释放
• jni中内存泄漏
• java native interface programing
• Java Native Interface Specification Contents