Question

我有这个代码的问题，如果我在客户端和服务器本地IP使用它，但如果我在客户端109.95.202.122 IP和服务器INADDR_ANY使用它不我在两台计算机上尝试这个但是仍然无法正常工作请帮助我。

客户端

#include <iostream>
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")

int main(void)
{
    WSADATA WsaDat;
    if(WSAStartup(MAKEWORD(2,2),&WsaDat)!=0)
    {
        std::cout<<"Winsock error - Winsock initialization failed\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    // Create our socket

    SOCKET Socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    if(Socket==INVALID_SOCKET)
    {
        std::cout<<"Winsock error - Socket creation Failed!\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    // Resolve IP address for hostname
    struct hostent *host;
    if((host=gethostbyname("109.95.202.122"))==NULL)
    {
        std::cout<<"Failed to resolve hostname.\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    // Setup our socket address structure
    SOCKADDR_IN SockAddr;
    SockAddr.sin_port=htons(8888);
    SockAddr.sin_family=AF_INET;
    SockAddr.sin_addr.s_addr=*((unsigned long*)host->h_addr);

    // Attempt to connect to server
    if(connect(Socket,(SOCKADDR*)(&SockAddr),sizeof(SockAddr))!=0)
    {
        std::cout<<"Failed to establish connection with server\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    // If iMode!=0, non-blocking mode is enabled.
    u_long iMode=1;
    ioctlsocket(Socket,FIONBIO,&iMode);

    // Main loop
    for(;;)
    {
        // Display message from server
        char buffer[1000];
        memset(buffer,0,999);
        int inDataLength=recv(Socket,buffer,1000,0);
        std::cout<<buffer;

        int nError=WSAGetLastError();
        if(nError!=WSAEWOULDBLOCK&&nError!=0)
        {
            std::cout<<"Winsock error code: "<<nError<<"\r\n";
            std::cout<<"Server disconnected!\r\n";
            // Shutdown our socket
            shutdown(Socket,SD_SEND);

            // Close our socket entirely
            closesocket(Socket);

            break;
        }
        Sleep(1000);
    }

    WSACleanup();
    system("PAUSE");
    return 0;
}

服务器

#include <iostream>
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")

int main()
{
    WSADATA WsaDat;
    if(WSAStartup(MAKEWORD(2,2),&WsaDat)!=0)
    {
        std::cout<<"WSA Initialization failed!\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    SOCKET Socket=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    if(Socket==INVALID_SOCKET)
    {
        std::cout<<"Socket creation failed.\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    SOCKADDR_IN serverInf;
    serverInf.sin_family=AF_INET;
    serverInf.sin_addr.s_addr=INADDR_ANY;
    serverInf.sin_port=htons(8888);

    if(bind(Socket,(SOCKADDR*)(&serverInf),sizeof(serverInf))==SOCKET_ERROR)
    {
        std::cout<<"Unable to bind socket!\r\n";
        WSACleanup();
        system("PAUSE");
        return 0;
    }

    listen(Socket,1);

    SOCKET TempSock=SOCKET_ERROR;
    while(TempSock==SOCKET_ERROR)
    {
        std::cout<<"Waiting for incoming connections...\r\n";
        TempSock=accept(Socket,NULL,NULL);
    }

    // If iMode!=0, non-blocking mode is enabled.
    u_long iMode=1;
    ioctlsocket(Socket,FIONBIO,&iMode);

    Socket=TempSock;
    std::cout<<"Client connected!\r\n\r\n";

    // Main loop
    for(;;)
    {
        char *szMessage="Welcome to the server!\r\n";
        send(Socket,szMessage,strlen(szMessage),0);

        int nError=WSAGetLastError();
        if(nError!=WSAEWOULDBLOCK&&nError!=0)
        {
            std::cout<<"Winsock error code: "<<nError<<"\r\n";
            std::cout<<"Client disconnected!\r\n";

            // Shutdown our socket
            shutdown(Socket,SD_SEND);

            // Close our socket entirely
            closesocket(Socket);

            break;
        }

        Sleep(1000);
    }

    WSACleanup();
    system("PAUSE");
    return 0;
}

Answer 1

猜测，但我认为你的问题是gethostbyname，它从内存中无法使用IP地址。也许看看getaddrinfo？

WinSock客户端连接

1 个答案: