c++ - 内存访问冲突错误c++

Question

我正在尝试使用多个隐蔽 channel 交换消息。所以，基本上，首先我需要选择我想用于通信的 channel ，然后选择我想与之聊天的用户的“destination_ip”，然后是

processMessage()

被调用。现在，要从一个 channel 移动到另一个 channel ，我必须关闭现有连接，然后打开一个与我要使用的新 channel 的新连接。我的下面的代码被修改为在关闭连接后继续使用相同的 channel ，并且只包含您需要的东西。

#include <channelmanager.hpp>
#include <thread>
#include <iostream>
#include <boost/test/unit_test.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/lexical_cast.hpp>
#include <stdio.h>
#include <string.h>
#include <fstream>
#include <openssl/hmac.h>

struct CommunicationFixture {
    CommunicationFixture() {
        channelmanager.setErrorStream(&cout);
        channelmanager.setOutputStream(&cout);
        destination_ip = "";
        channel_id = channelmanager.getChannelIDs()[0];

    }
    library::ChannelManager channelmanager;
    vector<string> last_adapters;
    string destination_ip;
    string channel_id = "";


    int processMessage(string message) {
        if (message.compare("exit") == 0) {
            channelmanager.closeConnection(destination_ip);
            return 1;
        }
        vector<string> arguments;
        boost::split(arguments, message, boost::is_any_of(" "), boost::token_compress_on);
        if (arguments[0].compare("argument") == 0) {
            if (arguments.size() < 2) {
                cout << "Not enough arguments" << endl;
                return 0;
            }
            string argument_list = arguments[1];
            for (unsigned int i = 2; i < arguments.size(); i++) {
                argument_list += " " + arguments[i];
            }
            channelmanager.setChannelArguments(destination_ip, argument_list);
            cout << "Set channel argument to '" << argument_list << "'." << endl;
            return 0;
        }
        if (message.compare("help") == 0) {
            cout << "Help not available in chat mode. Close chat first with 'exit'" << endl;
            return 0;
        }


        channelmanager.openConnection(destination_ip, channel_id);
        channelmanager.sendMessage(destination_ip, message);

        return 0;

    }

    int close(string destination){
        cout << "closing.." << endl;
        channelmanager.closeConnection(destination); //I believe i have the error because of this!
        return 0;
    }

};


BOOST_FIXTURE_TEST_SUITE(communication, CommunicationFixture)

BOOST_AUTO_TEST_CASE(basic_communication) {

    selectAdapterId(0);
    cout << "Test" << endl << endl;
    printCommands();
    cout << "Enter your command:" << endl;
    string command;
    int code = 0;
    while (code != 2) {
        std::getline(cin, command);
        code = processCommand(command);
        if (code == 1) {
            // chat
            cout << "chat started.." << endl;
            int chatCode = 0;


            while (chatCode != 1) {
                std::getline(cin, message);
                close(destination_ip);
                chatCode = processMessage(message);
                channelmanager.setErrorStream(&cout);
            }
            cout << "chat ended." << endl;
        }
    }



}

BOOST_AUTO_TEST_SUITE_END()

请注意，我认为错误是由于

function close()

因为没有它我不会收到任何错误。并且错误不会立即发生，而是在交换一些消息后发生。这是错误:

unknown location(0): fatal error: in "communication/basic_communication": memory access violation at address: 0x00000024: no mapping at fault address communicationTest.cpp(325): last checkpoint: "basic_communication" test entry

Answer 1

当您尝试访问一个未初始化的变量时，会发生内存访问冲突，在本例中为 channelmanager。

我只能看到您在 processMessage() 方法中初始化了 channelmanager 并且在初始化 channelmanager 之前关闭了连接发生在:

close(destination_ip);
chatCode = processMessage(message);

要么更改初始化，要么不在 processMessage() 方法之前关闭它。