Raknet实现的简单服务器与客户端的交互

1. 首先下载Raknet的源代码，我用的是4.0的，不是最新的，解压后编译DLL工程，编译完成后进入解压的根目录下，进入Lib文件夹下找到RakNet_DLL_Debug_Win32.dll，  RakNet_DLL_Debug_Win32.lib这两个库文件，并将其关联到工程中。

2. 将解压目录下Source文件夹下的资源也管理到你的工程中

进行完上面两步就将网络库配置完成，下面便开始服务器端与客户端的程序编写

// 服务器端程序

#include <string>
#include <sstream>
#include <iostream>
#include "raknet/RakPeerInterface.h"
#include "raknet/RakNetTypes.h"
#include "raknet/MessageIdentifiers.h" // RakNet自定义消息枚举定义处
#include "raknet/BitStream.h"  // RakNet消息包的Bit数据流 

#define MAX_CLIENTS 10
#define SERVER_PORT 60000
enum ChatMessagesDefine
{// 自定义消息枚举值，消息ID
    MSG_CHATWORD = ID_USER_PACKET_ENUM + ,   // 消息ID从RakNet定义的最后一个枚举开始
};  

// 服务器端程序
int _tmain(int argc, _TCHAR* argv[])
{
    // 给服务器端创建一个实例
    RakNet::RakPeerInterface* pPeer = RakNet::RakPeerInterface::GetInstance();
    if ( NULL == pPeer )
    {
        std::cout << "RakNet::RakPeerInterface::GetInstance() Error!" << std::endl << std::endl;
        return -;
    }
    else
    {
        std::cout << "--------- MyServer Init Success -----------" << std::endl << std::endl;
    }  

    RakNet::Packet* pPacket;
    std::cout << "Start Server ......" << std::endl << std::endl;
    //启动服务器
    pPeer->Startup( MAX_CLIENTS, &RakNet::SocketDescriptor( SERVER_PORT,  ),  );  

    //设置最大链接数
    pPeer->SetMaximumIncomingConnections( MAX_CLIENTS );  

    //////////////////////////////////////////////////////////////////////////
    while (  )
    {
        for ( pPacket = pPeer->Receive(); pPacket; pPeer->DeallocatePacket( pPacket ), pPacket = pPeer->Receive() )
        {
            switch ( pPacket->data[] )
            {
            case ID_REMOTE_DISCONNECTION_NOTIFICATION:
                std::cout << "Another client has disconnected !" << std::endl;
                break;
            case ID_REMOTE_CONNECTION_LOST:
                std::cout << "Another client has lost the connection !" << std::endl;
                break;
            case ID_REMOTE_NEW_INCOMING_CONNECTION:
                std::cout << "Another client has connected !" << std::endl;
                break;  

            case ID_CONNECTION_REQUEST_ACCEPTED: //
                //{
                //    std::cout << "Our connection request has been accepted !" << std::endl;  

                //    RakNet::BitStream bsOut;
                //    bsOut.Write( ( RakNet::MessageID )MSG_CHATWORD );
                //    bsOut.Write("Hello world");
                //    pPeer->Send( &bsOut, HIGH_PRIORITY, RELIABLE_ORDERED, 0, pPacket->systemAddress, false );
                //}
                break; 

            case ID_NEW_INCOMING_CONNECTION:
                {
                    std::cout << "Our connection request has been accepted !" << std::endl;  

                    RakNet::BitStream bsOut;
                    bsOut.Write( ( RakNet::MessageID )MSG_CHATWORD );
                    bsOut.Write("Hello world ! I'm successed ! Congratulations !");
                    pPeer->Send( &bsOut, HIGH_PRIORITY, RELIABLE_ORDERED, , pPacket->systemAddress, false );
                }
                std::cout << "A connection is incoming !" << std::endl;
                break;
            case ID_NO_FREE_INCOMING_CONNECTIONS:
                std::cout << "The server is full !" << std::endl;
                break;
            case ID_DISCONNECTION_NOTIFICATION:
                std::cout << "A client has disconnected !" << std::endl;
                break;
            case ID_CONNECTION_LOST:
                std::cout << "A client lost the connection !" << std::endl;
                break;  

                //用户自定义数据包
            case MSG_CHATWORD:
                {
                    RakNet::RakString rs;
                    RakNet::BitStream bsIn( pPacket->data, pPacket->length, false );
                    bsIn.IgnoreBytes( sizeof(RakNet::MessageID) );
                    bsIn.Read( rs );  //提取字符串
                    std::istringstream input_str(rs.C_String()); //存入字符串流
                    double v, h;
                    input_str >> v >> h; //提取想要的变量
                    std::cout << v << "  " << h << std::endl; //打印结果
                }
                break;  

            default:
                std::cout << "Message with identifier %i has arrived !" << pPacket->data[  ] << std::endl;
                break;
            }
        }
    }  

    //////////////////////////////////////////////////////////////////////////
    RakNet::RakPeerInterface::DestroyInstance( pPeer );  

    /*
    //创建一个实例
    RakNet::RakPeerInterface *server = RakNet::RakPeerInterface::GetInstance();

    //创建套接字描述，也就是指定一个通信端口（UDP无监听）
    RakNet::SocketDescriptor socketDescriptor;
    socketDescriptor.port = 30050;

    //启动服务器端
    bool b = server->Startup(2, &socketDescriptor, 1 )== RakNet::RAKNET_STARTED;

    //如果没有报错，服务端启动成功了。
    RakAssert(b);

    if ( b )
    {
        printf( "服务器启动成功！\n\n等待客户端的请求......\n\n" );
    }
    else
    {
        printf( "服务器启动失败！\n\n请重新启动服务器！\n\n" );
    }

    //设置最大连接数（此连接并不等同TCP的连接！），这一步必须设置，否则会出现客户端调用Connect失败
    server->SetMaximumIncomingConnections(2);

    //接下来就是处理数据发送接收的部分了
    while( 1 )
    {
        RakNet::Packet * packet = server->Receive();
        if( packet )
        {
            switch( packet->data[0] )
            {
                //用户自定义数据包的接收处理，此处显示接到的数据包内容。其他消息的处理可以同样用case语句
                case ID_USER_PACKET_ENUM:
                    printf("接收到自定义数据，内容: %s\n\n", packet->data );
                    break;
                default:
                    break;
            }
        }
    }
    */
    return ;
}

// 客户端程序

#include <string>
#include <sstream>
#include <iostream>

#include "raknet/RakPeerInterface.h"
#include "raknet/RakNetTypes.h"
#include "raknet/MessageIdentifiers.h"
#include "raknet/BitStream.h"

#define MAX_CLIENTS 10
#define SERVER_PORT 60000  

enum ChatMessagesDefine
{// 自定义消息枚举值，消息ID
    MSG_CHATWORD = ID_USER_PACKET_ENUM + ,        // 消息ID从RakNet定义的最后一个枚举开始
};  

// 客户端程序
int _tmain(int argc, _TCHAR* argv[])
{
    double v = 1000.023;
    double h = 10023.23;
    RakNet::RakPeerInterface *peer = RakNet::RakPeerInterface::GetInstance();  

    RakNet::SocketDescriptor sd;
    peer->Startup(, &sd, );  

    // 作为客户端连接，连接到主机ip地址和端口号
    peer->Connect("127.0.0.1", SERVER_PORT, , );  

    float k = ;
    int i = ;
    for ( i = ; i < ; i++ )
    {
        // 给主机发送数据
        RakNet::BitStream bsOut;
        bsOut.Write( (RakNet::MessageID)MSG_CHATWORD );
        std::ostringstream format_messege;
        format_messege << v++ << " " << h++;  // 输入信息到字符串流，用空格隔开，此处为飞行器速度高度V, h为double型
        //      bsOut.Write("hello");
        std::string ss = format_messege.str(); // str()返回的是临时对象
        bsOut.Write( ss.c_str() );
        peer->Send( &bsOut, HIGH_PRIORITY, RELIABLE_ORDERED, , RakNet::UNASSIGNED_SYSTEM_ADDRESS, true );
        Sleep(  );
    }

    RakNet::Packet * packet;
    while(  )
    {
        packet = peer->Receive();
        if( packet )
        {
            // 当接收到的消息的第一个字节的数据为 ID_CONNECTION_REQUEST_ACCEPTED 才表示服务端接受了连接请求！！！
            if( packet->data[] == MSG_CHATWORD )
            {
                RakNet::RakString rs;
                RakNet::BitStream bsIn( packet->data, packet->length, false );
                bsIn.IgnoreBytes(sizeof(RakNet::MessageID));
                bsIn.Read( rs );
                printf("server return = %s", rs.C_String() );
            }
        }
    }

    //断开连接，这个会给对方发送一个消息，告诉它要断开连接了。
    peer->Shutdown(  );   

    RakNet::RakPeerInterface::DestroyInstance(peer);  

    /*
    RakNet::RakPeerInterface *client = RakNet::RakPeerInterface::GetInstance();

    RakNet::SocketDescriptor socketDescriptor;
    socketDescriptor.port = 0;

    client->Startup(1, &socketDescriptor, 1 );

    // 客户端连接服务端，判断返回值和RakNet::CONNECTION_ATTEMPT_STARTED是否相等，
    // 相等只是代表请求投递成功，并不意味着服务端接收了连接请求
    bool rs = ( client->Connect("127.0.0.1", 30050, NULL, 0, 0) == RakNet::CONNECTION_ATTEMPT_STARTED );

    // 数据包
    RakNet::Packet *packet;

    bool bIsConn = false;

    // 循环接收来自服务端的消息
    while(1)
    {
        packet = client->Receive();
        if( packet )
        {
            // 当接收到的消息的第一个字节的数据为 ID_CONNECTION_REQUEST_ACCEPTED 才表示服务端接受了连接请求！！！
            if( packet->data[0] == ID_CONNECTION_REQUEST_ACCEPTED )
            {
                bIsConn = true;
                printf("服务器端受理了客户端的请求！\n\n");

                char flag = (char)ID_USER_PACKET_ENUM;
                char buffer[ ] = "这是来自客户端的消息";
                buffer[ 0 ] = flag;

                //连接ok后发送一个字符串到服务端
                uint32_t sendrs = client->Send( (const char*)buffer,
                                                strlen(buffer)+1,
                                                HIGH_PRIORITY,
                                                RELIABLE_ORDERED,
                                                0,
                                                RakNet::UNASSIGNED_SYSTEM_ADDRESS,
                                                true );
                printf("服务器端返回来的消息: %d\n",sendrs);
            }

            //如果没有连接成功，则继续连接，直到服务端返回的信息告诉我们连接成功了
            if( !bIsConn )
            {
                printf("连接服务器失败！\n");
                client->Connect("127.0.0.1", 30050, NULL, 0, 0);
            }
        }
    }
    */
    system( "pause");
    return ;
}

ps: 下面是将网络库关联到你的工程中

1.右键工程--》属性--》c/c++ --》常规--》"附加包含目录"，将源文件和上面的两个文件包含进去

2.右键工程--》属性--》链接器 --》常规--》"附加包含目录"，将源文件和上面的两个文件包含进去

3.右键工程--》属性--》链接器 --》输入--》"附加依赖项"，添加 RakNet_DLL_Debug_Win32.lib 库