运维 网站开发,做影视网站赚钱,如何优化关键词排名到首页,怎么做免费的网站如果让你在jni层#xff0c;找到一个目标函数#xff0c;你应该怎么做#xff1f; 1.找到目标类#xff0c;然后打印所有的方法#xff0c;然后通过方法返回值#xff0c;方法参数#xff0c;方法修饰符来确定我们要找的目标函数代码如下
#include jni.h
#incl… 如果让你在jni层找到一个目标函数你应该怎么做 1.找到目标类然后打印所有的方法然后通过方法返回值方法参数方法修饰符来确定我们要找的目标函数代码如下
#include jni.h
#include stdio.hvoid printMethod(JNIEnv *env, jobject method) {// 获取 Method 类的 Class 对象jclass methodClass (*env)-GetObjectClass(env, method);// 获取 getName 方法的 Method 对象jmethodID getNameMethod (*env)-GetMethodID(env, methodClass, getName, ()Ljava/lang/String;);// 调用 getName 方法获取方法名jstring methodName (jstring)(*env)-CallObjectMethod(env, method, getNameMethod);// 将 Java 字符串转换为 C 字符串const char *cMethodName (*env)-GetStringUTFChars(env, methodName, NULL);// 获取返回值类型jmethodID getReturnTypeMethod (*env)-GetMethodID(env, methodClass, getReturnType, ()Ljava/lang/Class;);jobject returnTypeObject (*env)-CallObjectMethod(env, method, getReturnTypeMethod);jclass returnTypeClass (*env)-GetObjectClass(env, returnTypeObject);// 获取 getName 方法的 Method 对象jmethodID returnTypeGetNameMethod (*env)-GetMethodID(env, returnTypeClass, getName, ()Ljava/lang/String;);jstring returnTypeString (jstring)(*env)-CallObjectMethod(env, returnTypeObject, returnTypeGetNameMethod);const char *cReturnType (*env)-GetStringUTFChars(env, returnTypeString, NULL);// 获取参数类型jmethodID getParameterTypesMethod (*env)-GetMethodID(env, methodClass, getParameterTypes, ()[Ljava/lang/Class;);jobjectArray parameterTypesArray (jobjectArray)(*env)-CallObjectMethod(env, method, getParameterTypesMethod);jsize parameterTypesLength (*env)-GetArrayLength(env, parameterTypesArray);printf(Method Name: %s\n, cMethodName);printf(Return Type: %s\n, cReturnType);printf(Parameter Types: );// 打印参数类型for (int i 0; i parameterTypesLength; i) {jobject parameterTypeObject (*env)-GetObjectArrayElement(env, parameterTypesArray, i);jclass parameterTypeClass (*env)-GetObjectClass(env, parameterTypeObject);jmethodID parameterTypeGetNameMethod (*env)-GetMethodID(env, parameterTypeClass, getName, ()Ljava/lang/String;);jstring parameterTypeString (jstring)(*env)-CallObjectMethod(env, parameterTypeObject, parameterTypeGetNameMethod);const char *cParameterType (*env)-GetStringUTFChars(env, parameterTypeString, NULL);printf(%s , cParameterType);// 释放资源(*env)-ReleaseStringUTFChars(env, parameterTypeString, cParameterType);}// 获取修饰符的值jmethodID getModifiersMethod (*env)-GetMethodID(env, methodClass, getModifiers, ()I);jint modifiers (*env)-CallIntMethod(env, method, getModifiersMethod);printf(\nModifiers: %d\n, modifiers);// 释放资源(*env)-ReleaseStringUTFChars(env, methodName, cMethodName);(*env)-ReleaseStringUTFChars(env, returnTypeString, cReturnType);
}JNIEXPORT void JNICALL Java_com_example_MyClass_invokeGetMethods(JNIEnv *env, jobject obj) {// 获取当前类的 Class 对象jclass clazz (*env)-GetObjectClass(env, obj);// 获取 Class 类的 Class 对象jclass classClass (*env)-FindClass(env, java/lang/Class);// 获取 getMethods 方法的 Method 对象jmethodID getMethodsMethod (*env)-GetMethodID(env, classClass, getMethods, ()[Ljava/lang/reflect/Method;);// 调用 getMethods 方法获取 Method 数组jobjectArray methodsArray (jobjectArray)(*env)-CallObjectMethod(env, clazz, getMethodsMethod);// 获取数组长度jsize arrayLength (*env)-GetArrayLength(env, methodsArray);// 遍历 Method 数组for (int i 0; i arrayLength; i) {// 获取 Method 对象jobject methodObject (*env)-GetObjectArrayElement(env, methodsArray, i);// 打印方法信息printf(Method %d:\n, i 1);printMethod(env, methodObject);printf(\n);}
}
