frida hook这种写法的话 进程必须是打开状态

import frida, sys
'''
我们要hook构造函数,和普通的函数是有区别的,要用$init这种形式,并且要return this.$init(arg1,arg2)调用原始的函数实现
'''
jscode = """
Java.perform(function () {
    var utils = Java.use('com.xiaojianbang.app.Utils');
    utils.getCalc.implementation = function (a, b) {
        console.log("Hook Start...");
        send(arguments[0]);
        send(b);
        send("Success!");
        var num = this._getCalc(100, 200, 300);
        send(num);
        return num;
    }

    var money = Java.use('com.xiaojianbang.app.Money');
    money.$init.implementation = function (a, b) {
        console.log("Hook Start...");
        send(arguments[0]);
        send(b);
        send("Success!");
        return this.$init(10000, "美元");
    }

});
"""

def message(message, data):
    if message["type"] == 'send':
        print("[*] {0}".format(message['payload']))
    else:
        print(message)

process = frida.get_remote_device().attach('com.xiaojianbang.app')
script= process.create_script(jscode)
script.on("message", message)
script.load()
sys.stdin.read()

frida hook构造函数
frida hook构造函数