JNI exception handling

C++ Exception handling

• 1. Customize struct overwrite exception The method inside
• 2.throw Throw custom type exception ,catch post-processing

try {
	// c++ Exception handling ,
	// 1. Override inheritance exception Methods , Throw a custom exception class 
	// 2.throw  Custom exception (string,int etc. ),catch post-processing 
	int a = 10;
	int b = 0;
	if (b == 0) {
//            throw "b is zero";
		throw NoZeroException();
	}
	int c = a / b;
}
catch (NoZeroException e) {
	__android_log_print(ANDROID_LOG_INFO, "JNI_TAG", "exception ---> %s", e.what());
}
catch (const char *message) {
	__android_log_print(ANDROID_LOG_INFO, "JNI_TAG", "exception ---> %s", message);
}

JNI exception handling

• 1.native Layer handles
• 2. Throw a java Class Throwable object , Give Way java Layer handles

jclass jclz = env->GetObjectClass(thiz);
jfieldID f_id = env->GetFieldID(jclz, "name", "Ljava/lang/String;");
//  Check whether there is abnormality 
bool error = env->ExceptionCheck();
if (error) {
    
	__android_log_print(ANDROID_LOG_INFO, "JNI_TAG", "exception --->  Something went wrong ");
	//  Clear exceptions 
	env->ExceptionClear();
	// 1.native Layer handles 
	// 2. Throw a java Class Throwable object , Give Way java Layer handles 
	jclass no_such_method = env->FindClass("java/lang/NoSuchFieldException");
	env->ThrowNew(no_such_method,"NoSuchFieldException name");
}

java Layer handles

public native void jniException();

// java Layer handling exception 
try{
    
	jniException();
}catch (Exception e){
    
	//e.printStackTrace();
	Log.i("JNI_TAG"," abnormal ");
}