JNI捕获异常

发布时间：2020-07-20 23:27:52 来源：网络阅读：944 作者：slaron 栏目：移动开发

jnihelp.h头文件根据需求自行添加，也可以直接删除

#define LOG_TAG "JNIHelp"
#include "JNIHelp.h"
#include "android/log.h"
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>

static void getExceptionSummary(JNIEnv* env, jthrowable exception, char* buf, size_t bufLen)
{
int success = 0;

/* get the name of the exception's class */
jclass exceptionClazz = env->GetObjectClass(exception); // can't fail
jclass classClazz = env->GetObjectClass(exceptionClazz); // java.lang.Class, can't fail
jmethodID classGetNameMethod = env->GetMethodID(classClazz, "getName", "()Ljava/lang/String;");
jstring classNameStr = static_cast<jstring>(env->CallObjectMethod(exceptionClazz, classGetNameMethod));
if (classNameStr != NULL) {
      /* get printable string */
      const char* classNameChars = env->GetStringUTFChars( classNameStr, NULL);
      if (classNameChars != NULL) {
         /* if the exception has a message string, get that */
         jmethodID throwableGetMessageMethod = env->GetMethodID(
                  exceptionClazz, "getMessage", "()Ljava/lang/String;");
         jstring messageStr = static_cast<jstring>(env->CallObjectMethod(exception, throwableGetMessageMethod));

         if (messageStr != NULL) {
            const char* messageChars = env->GetStringUTFChars( messageStr, NULL);
            if (messageChars != NULL) {
                  snprintf(buf, bufLen, "%s: %s", classNameChars, messageChars);
                  env->ReleaseStringUTFChars( messageStr, messageChars);
            } else {
                  env->ExceptionClear(); // clear OOM
                  snprintf(buf, bufLen, "%s: <error getting message>", classNameChars);
            }
            env->DeleteLocalRef( messageStr);
         } else {
            strncpy(buf, classNameChars, bufLen);
            buf[bufLen - 1] = '\0';
         }

         env->ReleaseStringUTFChars( classNameStr, classNameChars);
         success = 1;
      }
      env->DeleteLocalRef( classNameStr);
}
env->DeleteLocalRef( classClazz);
env->DeleteLocalRef( exceptionClazz);

if (! success) {
      env->ExceptionClear();
      snprintf(buf, bufLen, "%s", "<error getting class name>");
}
}
/* Throw an exception with the specified class and an optional message.*/
int jniThrowException(JNIEnv* env)
{
   jclass exceptionClass;
   int result = 0;

   if (env->ExceptionCheck()) {
      /* TODO: consider creating the new exception with this as "cause" */
      char buf[256];

      jthrowable exception = env->ExceptionOccurred();
      env->ExceptionClear();
      if (exception != NULL) {
         getExceptionSummary(env,exception, buf, sizeof(buf));
         //LOGW("Discarding pending exception (%s) to throw %s\n", buf, className);
         __android_log_print(ANDROID_LOG_INFO, "", "Discarding pending exception (%s) to throw\n",buf);
         env->DeleteLocalRef(exception);
         result = -1;
      }
   }
   return result;
}

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