接收或发送winsock2不发送数据

问题描述

我正在尝试学习如何构建服务器。尝试将数据从我的客户端应用程序发送到服务器应用程序时，服务器应用程序未收到任何数据。我认为这仅仅是因为我对所发送的char缓冲区缺乏了解。客户端可以加入服务器，并且服务器确实注册了客户端。

服务器：

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include<windows.h>
#include<winsock2.h>
#include<ws2tcpip.h>
#include<iphlpapi.h>


#include<iostream>
#include<fstream>
#include<string>

#pragma comment(lib,"ws2_32.lib")
#define PORT "69"
#define BUFFLEN 512



int main(int argc,char* argv[]) {
    bool active = true;

    WSADATA wsaData;
    WSAStartup(MAKEWORD(2,2),&wsaData);

    struct addrinfo* result = NULL,* ptr = NULL,hints;

    ZeroMemory(&hints,sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;
    hints.ai_flags = AI_PASSIVE;

    std::cout << "which port should be initialized?\n>>>";
    std::string input; 
    std::cin >> input;
    std::cout << "initializing..." << std::endl;
    getaddrinfo(NULL,input.c_str(),&hints,&result);



    SOCKET listenSocket = INVALID_SOCKET;
    listenSocket = socket(result->ai_family,result->ai_socktype,result->ai_protocol);
    bind(listenSocket,result->ai_addr,(int)result->ai_addrlen);
    freeaddrinfo(result);

    listen(listenSocket,SOMAXCONN);
    std::cout << "initialized" << std::endl;

    //accept connection
    std::cout << "waiting for client..." << std::endl;
    SOCKET clientSocket = INVALID_SOCKET;
    clientSocket = accept(listenSocket,NULL,NULL);
    std::cout << "client connected" << std::endl;

    char recvBuf[100];
    int dataRes;
    std::cout << "TERMINAL:" << std::endl;
    while (active) {
        dataRes = recv(clientSocket,recvBuf,100,0);
        if (dataRes > 0) {
            if (recvBuf == "terminate")
                active = false;
            else
                std::cout << "CLIENT:" << recvBuf << std::endl;
        }
    }

    shutdown(clientSocket,SD_SEND);
    closesocket(clientSocket);
    WSACleanup();
}

客户：

#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdlib.h>
#include <iostream>


// Need to link with Ws2_32.lib,Mswsock.lib,and Advapi32.lib
#pragma comment (lib,"Ws2_32.lib")
#pragma comment (lib,"Mswsock.lib")
#pragma comment (lib,"AdvApi32.lib")


#define DEFAULT_BUFLEN 512
#define DEFAULT_PORT "69"

int __cdecl main(int argc,char** argv)
{
    WSADATA wsaData;
    SOCKET ConnectSocket = INVALID_SOCKET;
    struct addrinfo* result = NULL,hints;
    const char* sendbuf = "this is a test";
    char recvbuf[DEFAULT_BUFLEN];
    int iResult;
    int recvbuflen = DEFAULT_BUFLEN;
    std::cout << "enter ip address\n>>>";
    std::string input;
    std::cin >> input;

    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,&wsaData);

    ZeroMemory(&hints,sizeof(hints));
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    // Resolve the server address and port
    iResult = getaddrinfo(input.c_str(),DEFAULT_PORT,&result);

    // Attempt to connect to an address until one succeeds
    for (ptr = result; ptr != NULL; ptr = ptr->ai_next) {

        // Create a SOCKET for connecting to server
        ConnectSocket = socket(ptr->ai_family,ptr->ai_socktype,ptr->ai_protocol);

        // Connect to server.
        iResult = connect(ConnectSocket,ptr->ai_addr,(int)ptr->ai_addrlen);
        if (iResult == SOCKET_ERROR) {
            closesocket(ConnectSocket);
            ConnectSocket = INVALID_SOCKET;
            continue;
        }
        break;
    }

    freeaddrinfo(result);
    if (ConnectSocket == INVALID_SOCKET) {
         printf("Unable to connect to server!\n");
         WSACleanup();
         return 1;
    }


    //iResult = send(ConnectSocket,sendbuf,(int)strlen(sendbuf),0);
    iResult = shutdown(ConnectSocket,SD_SEND);

    // Receive until the peer closes the connection
    bool serverActive = true;
    while (serverActive) {
        char inp[100];
        std::cin >> inp;
        std::cout << "SENT:" << inp << std::endl;
        send(ConnectSocket,inp,(int)strlen(inp),0);

        if (inp == "terminate")
            serverActive = false;
    }


   // cleanup
   closesocket(ConnectSocket);
   WSACleanup();

   return 0;
}

解决方法

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