catchthrow.c

jni java本地接口编程例子原代码,是java调用本地操作系统代码的接口

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

JNIEXPORT void JNICALL 
Java_CatchThrow_doit(JNIEnv *env, jobject obj)
{
    jthrowable exc;
    jclass cls = (*env)->GetObjectClass(env, obj);
    jmethodID mid = 
        (*env)->GetMethodID(env, cls, "callback", "()V");
    if (mid == NULL) {
        return;
    }
    (*env)->CallVoidMethod(env, obj, mid);
    exc = (*env)->ExceptionOccurred(env);
    if (exc) {
        /* We don't do much with the exception, except that
         * we print a debug message for it, clear it, and 
         * throw a new exception. */
        jclass newExcCls;
        (*env)->ExceptionDescribe(env);
        (*env)->ExceptionClear(env);
        newExcCls = (*env)->FindClass(env, 
                      "java/lang/IllegalArgumentException");
        if (newExcCls == NULL) {
            /* Unable to find the exception class, give up. */
            return;
        }
        (*env)->ThrowNew(env, newExcCls, "thrown from C code");
    }
}