c++ ENET库，客户端断开连接，收到数据包时错误

zzoitvuj  于 2023-04-01  发布在  其他
关注(0)|答案(1)|浏览(171)

我试图开发一个简单的纸牌游戏，使用快板和ENET的多人部分。现在，我已经找到了一些教程在线，我想出了一个简单的代码，我计划在游戏期间用于管理客户端/服务器信息交换。基本上，客户端发送有关他们的卡的信息到服务器，服务器将其发送回所有客户端，以允许他们更新。
问题是，当我运行这段代码我有一些问题，这里的服务器：
///////服务器端////////

#include <string>
#include <iostream>
#include <enet/enet.h>
#include <string.h>

using namespace std;

//SImple function to send a single packet to all clients
void BroadcastPacket(ENetHost* server, const char* data)
{
    ENetPacket* packet = enet_packet_create(data, strlen(data) + 1, ENET_PACKET_FLAG_RELIABLE);
    enet_host_broadcast(server, 0, packet);
}

int main()
{  
    //--Initialize
    if(enet_initialize()) { std::cout << ">Couldn't initialize ENET" << std::endl; exit(-1);}

    //--Set address to "any"
    ENetAddress address;
    address.host = ENET_HOST_ANY;

    //--Set the port
    std::cout << "Port: ";
    std::cin >> address.port;
    std::cin.clear();

    //--Create a server to the address chosen
    ENetHost* server;
    server = enet_host_create(&address, 6, 2, 0, 0);
    if(server == NULL) { std::cout << ">Couldn't initialize host" << std::endl; enet_deinitialize(); exit(1); }

    std::string aux; 
    const char* aux_data;

    ENetEvent event;
    while(enet_host_service(server, &event, 0) >= 0) {
        if(event.type == ENET_EVENT_TYPE_CONNECT) { // client connected
            static unsigned int num = 0;
            ENetAddress remote = event.peer->address; // peer address
            char ip[256];
            enet_address_get_host_ip(&remote, ip, 256);
            std::cout << "ip:" << ip << " connected, id: " << num << std::endl;
            event.peer->data = (void*)num++;

        } else if(event.type == ENET_EVENT_TYPE_RECEIVE) {    // recv data
            std::cout << "received data from: " << event.peer->incomingPeerID << " and data is: > " << (const char*)event.packet->data << std::endl;
            
            //--Add to the packet to send the client ID (just a test in order to
            //--modify and resend a packet
            const char* data = (const char*)event.packet->data;
            std::string str_data{data};
            aux.clear();
            aux = "<" + to_string(event.peer->incomingPeerID) + ">" + data;
            BroadcastPacket(server, aux.c_str());
           
            enet_packet_destroy(event.packet); // free
            std::cout << std::endl;

        } else if(event.type == ENET_EVENT_TYPE_DISCONNECT) {     // disconnect
            std::cout << "> Client id" << event.peer->data << " disconnected" << std::endl;
        }
    }

    enet_deinitialize();
    return 0;
}

这里是客户端：

#include <string>
#include <iostream>
#include <enet/enet.h>

using namespace std;

int main()
{
    //--Initialize ENET
    if(enet_initialize()) { std::cout << ">Couldn't initialize ENET" << std::endl; exit(-1); }

    //--Initialize client
    ENetHost* client = enet_host_create(NULL, 1, 2, 0, 0);
    if(client == NULL) { std::cout << ">Couldn't create client" << std::endl; exit(-1); }

    std::string name;
    std::cout << "Inser nickname: ";
    std::getline(std::cin, name);

    //--Initialize address (TODO: extend address for general IP)
    ENetAddress address;
    if(enet_address_set_host(&address, "127.0.0.1") < 0) { std::cout << ">Host address doesn't exist" << endl; exit(-1); }
    
    //--Choose a port (MATCH IT WITH THE SERVER)
    std::cout << "Inser Port number: ";
    std::cin >> address.port;
    std::cin.clear();

    //--Connect with host
    ENetPeer* server = enet_host_connect(client, &address, 2, 0);
    if(server == NULL) {
        std::cout << ">Couldn't connect with host" << std::endl;
          exit(-1);
    }

    //--Define event for polling
    ENetEvent event;
    if(enet_host_service (client, &event, 5000) > 0 &&
       event.type == ENET_EVENT_TYPE_CONNECT) {
        std::cout << ">Connected successfully" << std::endl;
    } else {
        enet_peer_reset (server);
        std::cout << "failed to connect" << std::endl;
          exit(1);
    }
    const char* aux_char;
    string data;

    

    
while(1){

    //--The host_service is for polling purposes. Must be called 
    //--often or the client will automatically disconnect from the
    //--the host. 
    if(enet_host_service(client, &event, 1000) >= 0) {
        if(event.type == ENET_EVENT_TYPE_RECEIVE) {    // recv data
            
            cout << ">Received data from: " << event.peer->incomingPeerID << ", message:$ - " << (const char*)event.packet->data << endl;
            aux_char = (const char*)event.packet->data;
            std::string str_data{aux_char};
            enet_packet_destroy(event.packet); // free
        }
    }
    
    //--Just for debugging, we don't need it in game
    sleep(1);

    //--Preparaing packet
    data.clear();
    data = name + " says " + to_string(4) + " is good number "; 

    ENetPacket* packet1 = enet_packet_create(data.c_str(), data.length(), ENET_PACKET_FLAG_RELIABLE);
    if(!packet1) {
        std::cout << ">Couldn't create packet" << std::endl;
        exit(-1);
    }

    //--Send packet to the server
    if(enet_peer_send(server, 0, packet1) < 0) {
        std::cout << ">Couldn't send packet" << std::endl;
        exit(-1);
    }

    //--Don't know why, without this everything explodes
    enet_host_flush (client);
    
}

    //--After game loop, to disconnect 
    enet_peer_disconnect (server, 0);

    while(enet_host_service (client, &event, 5000) > 0) {
        switch(event.type) {
          case ENET_EVENT_TYPE_RECEIVE:
            enet_packet_destroy (event.packet);
            break;

          case ENET_EVENT_TYPE_DISCONNECT:
            std::cout << ">Client is disconnected" << std::endl;
            enet_deinitialize();
            break;
        }
    }

    enet_peer_reset(server);
    std::cout << ">Force reset" << std::endl;

    enet_deinitialize();

    return 0;
}

当我运行代码时，服务器在我选择的端口上正确侦听，当我运行一些客户端时，成功连接到服务器并开始循环发送消息。问题是，第一次，消息被正确发送，从第二个字符串被更改。不仅如此，一段时间后，两个客户端断开连接。

////SERVER SIDE///////
Port: 4444
ip:127.0.0.1 connected, id: 0
received data from: 0 and data is: > nick says 4 is good number 

received data from: 0 and data is: > nick says 4 is good number er 

received data from: 0 and data is: > nick says 4 is good number er er 

received data from: 0 and data is: > nick says 4 is good number er er er 

received data from: 0 and data is: > nick says 4 is good number er er er er 

ip:127.0.0.1 connected, id: 1
received data from: 0 and data is: > nick says 4 is good number er er er er 

received data from: 0 and data is: > nick says 4 is good number er er er er

....
....

received data from: 1 and data is: > nath says 4 is good number er er er er 

received data from: 0 and data is: > nick says 4 is good number er er er er 

> Client id0 disconnected
> Client id0x1 disconnected

///////FIRST CLIENT//////////

Inser nickname: nick
Inser Port number: 4444
>Connected successfully
>Received data from: 0, message:$ - <0>nick says 4 is good number 
>Received data from: 0, message:$ - <0>nick says 4 is good number er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 

 ///the new client join the server
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Couldn't send packet

////SECOND CLIENT/////
Inser nickname: nath
Inser Port number: 4444
>Connected successfully
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Received data from: 0, message:$ - <0>nick says 4 is good number er er er er 
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Received data from: 0, message:$ - <1>nath says 4 is good number er er er er 
>Couldn't send packet

有人能帮忙吗？谢谢！

c++

1条答案

按热度按时间
cngwdvgl

cngwdvgl1#

在客户端代码ENetPacket* packet1 = enet_packet_create(data.c_str(), data.length(), ENET_PACKET_FLAG_RELIABLE);中，不要使用data.length()，而是使用sizeof(data)

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