JNI exception capture

JNI exception capture
Http: // 192.210.60.138/DZ/Forum. php? MoD = viewthread & tid = 19 & fromuid = 1
(Source: istudy)

 

#define LOG_TAG "JNIHelp"#include "JNIHelp.h"#include "android/log.h"#include <string.h>#include <assert.h>#include <stdio.h>#include <stdlib.h>/* * Register native JNI-callable methods. * "className" looks like "java/lang/String" */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; }