windows网络编程-socket

server部分

1，Initialize Winsock.
2，Create a socket.
3，Bind the socket.
4，Listen on the socket for a client.
5，Accept a connection from a client.
6，Receive and send data.
7，Disconnect.

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

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

#pragma comment(lib, "Ws2_32.lib")

int main()
{
    //Initializing Winsock
    WSADATA wsaData;
    int iResult;
    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0)
    {
        printf("WSAStartup failed: %d
", iResult);
        return 1;
    }

    //Creating a Socket for the Server
    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;

    iResult = getaddrinfo(NULL, "20000", &hints, &result);
    if (iResult != 0)
    {
        printf("getaddrinfo failed: %d
", iResult);
        WSACleanup();
        return 1;
    }

    SOCKET listenSocket = INVALID_SOCKET;
    listenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

    if (listenSocket == INVALID_SOCKET) {
        printf("Error at socket(): %ld
", WSAGetLastError());
        freeaddrinfo(result);
        WSACleanup();
        return 1;
    }

    //Binding a Socket
    iResult = bind(listenSocket, result->ai_addr, (int)result->ai_addrlen);
    if (iResult == SOCKET_ERROR) {
        printf("bind failed with error: %d
", WSAGetLastError());
        freeaddrinfo(result);
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    freeaddrinfo(result);

    //Listening on a Socket
    iResult = listen(listenSocket, SOMAXCONN);
    if (iResult == SOCKET_ERROR) {
        printf("Listen failed with error: %ld
", WSAGetLastError());
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    //Accepting a Connection
    SOCKET clientSocket = INVALID_SOCKET;
    clientSocket = accept(listenSocket, NULL, NULL);
    if (clientSocket == INVALID_SOCKET) {
        printf("accept failed: %d
", WSAGetLastError());
        closesocket(listenSocket);
        WSACleanup();
        return 1;
    }

    //Receiving and Sending Data on the Server
    #define DEFAULT_BUFLEN 512

    char recvbuf[DEFAULT_BUFLEN];
    int  iSendResult;
    int recvbuflen = DEFAULT_BUFLEN;

    // Receive until the peer shuts down the connection
    do {

        iResult = recv(clientSocket, recvbuf, recvbuflen, 0);
        if (iResult > 0) {
            printf("Bytes received: %d
", iResult);

            // Echo the buffer back to the sender
            iSendResult = send(clientSocket, recvbuf, iResult, 0);
            if (iSendResult == SOCKET_ERROR) {
                printf("send failed: %d
", WSAGetLastError());
                closesocket(clientSocket);
                WSACleanup();
                return 1;
            }
            printf("Bytes sent: %d
", iSendResult);
        }
        else if (iResult == 0)
            printf("Connection closing...
");
        else {
            printf("recv failed: %d
", WSAGetLastError());
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }

    } while (iResult > 0);

    //Disconnecting the Server
    // shutdown the send half of the connection since no more data will be sent
    iResult = shutdown(clientSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed: %d
", WSAGetLastError());
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

    return 0;
}

client部分

1，Initialize Winsock.
2，Create a socket.
3，Connect to the server.
4，Send and receive data.
5，Disconnect.