原文: 在windows下用C语言写socket通讯实例

From:Microsoft Dev Center

#undef UNICODE#define WIN32_LEAN_AND_MEAN#include <windows.h>#include <winsock2.h>#include <ws2tcpip.h>#include <stdlib.h>#include <stdio.h>// Need to link with Ws2_32.lib#pragma comment (lib, "Ws2_32.lib")// #pragma comment (lib, "Mswsock.lib")#define DEFAULT_BUFLEN 512#define DEFAULT_PORT "27015"int __cdecl main(void) {    WSADATA wsaData;    int iResult;    SOCKET ListenSocket = INVALID_SOCKET;    SOCKET ClientSocket = INVALID_SOCKET;    struct addrinfo *result = NULL;    struct addrinfo hints;    int iSendResult;    char recvbuf[DEFAULT_BUFLEN];    int recvbuflen = DEFAULT_BUFLEN;    printf("from server:\n");    // Initialize Winsock    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);    if (iResult != 0) {        printf("WSAStartup failed with error: %d\n", iResult);        return 1;    }    ZeroMemory(&hints, sizeof(hints));    hints.ai_family = AF_INET;    hints.ai_socktype = SOCK_STREAM;    hints.ai_protocol = IPPROTO_TCP;    hints.ai_flags = AI_PASSIVE;    // Resolve the server address and port    iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result);    if ( iResult != 0 ) {        printf("getaddrinfo failed with error: %d\n", iResult);        WSACleanup();        return 1;    }    // Create a SOCKET for connecting to server    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);    if (ListenSocket == INVALID_SOCKET) {        printf("socket failed with error: %ld\n", WSAGetLastError());        freeaddrinfo(result);        WSACleanup();        return 1;    }    // Setup the TCP listening socket    iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);    if (iResult == SOCKET_ERROR) {        printf("bind failed with error: %d\n", WSAGetLastError());        freeaddrinfo(result);        closesocket(ListenSocket);        WSACleanup();        return 1;    }    freeaddrinfo(result);    iResult = listen(ListenSocket, SOMAXCONN);    if (iResult == SOCKET_ERROR) {        printf("listen failed with error: %d\n", WSAGetLastError());        closesocket(ListenSocket);        WSACleanup();        return 1;    }    // Accept a client socket    ClientSocket = accept(ListenSocket, NULL, NULL);    if (ClientSocket == INVALID_SOCKET) {        printf("accept failed with error: %d\n", WSAGetLastError());        closesocket(ListenSocket);        WSACleanup();        return 1;    }    // No longer need server socket    closesocket(ListenSocket);    // Receive until the peer shuts down the connection    do {        iResult = recv(ClientSocket, recvbuf, recvbuflen, 0);        if (iResult > 0) {            printf("Bytes received: %d\n", iResult);        // Echo the buffer back to the sender            iSendResult = send( ClientSocket, recvbuf, iResult, 0 );            if (iSendResult == SOCKET_ERROR) {                printf("send failed with error: %d\n", WSAGetLastError());                closesocket(ClientSocket);                WSACleanup();                return 1;            }            printf("Bytes sent: %d\n", iSendResult);        }        else if (iResult == 0)            printf("Connection closing...\n");        else  {            printf("recv failed with error: %d\n", WSAGetLastError());            closesocket(ClientSocket);            WSACleanup();            return 1;        }    } while (iResult > 0);    // shutdown the connection since we‘re done    iResult = shutdown(ClientSocket, SD_SEND);    if (iResult == SOCKET_ERROR) {        printf("shutdown failed with error: %d\n", WSAGetLastError());        closesocket(ClientSocket);        WSACleanup();        return 1;    }    // cleanup    closesocket(ClientSocket);    WSACleanup();    return 0;}

#define WIN32_LEAN_AND_MEAN#include <windows.h>#include <winsock2.h>#include <ws2tcpip.h>#include <stdlib.h>#include <stdio.h>// 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 "27015"int __cdecl main(int argc, char **argv) {    WSADATA wsaData;    SOCKET ConnectSocket = INVALID_SOCKET;    struct addrinfo *result = NULL,                    *ptr = NULL,                    hints;    char *sendbuf = "this is a test";    char recvbuf[DEFAULT_BUFLEN];    int iResult;    int recvbuflen = DEFAULT_BUFLEN;        // Validate the parameters   /* if (argc != 2) {        printf("usage: %s server-name\n", argv[0]);        return 1;    }*/    // Initialize Winsock	//The WSAStartup function is called to initiate use of WS2_32.dll.    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);    if (iResult != 0) {        printf("WSAStartup failed with error: %d\n", iResult);        return 1;    }    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("localhost", DEFAULT_PORT, &hints, &result);    if ( iResult != 0 ) {        printf("getaddrinfo failed with error: %d\n", iResult);        WSACleanup();        return 1;    }    // 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);        if (ConnectSocket == INVALID_SOCKET) {            printf("socket failed with error: %ld\n", WSAGetLastError());            WSACleanup();            return 1;        }        // 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;    }    // Send an initial buffer    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );    if (iResult == SOCKET_ERROR) {        printf("send failed with error: %d\n", WSAGetLastError());        closesocket(ConnectSocket);        WSACleanup();        return 1;    }    printf("Bytes Sent: %ld\n", iResult);    // shutdown the connection since no more data will be sent    iResult = shutdown(ConnectSocket, SD_SEND);    if (iResult == SOCKET_ERROR) {        printf("shutdown failed with error: %d\n", WSAGetLastError());        closesocket(ConnectSocket);        WSACleanup();        return 1;    }    // Receive until the peer closes the connection    do {        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);        if ( iResult > 0 )            printf("Bytes received: %d\n", iResult);        else if ( iResult == 0 )            printf("Connection closed\n");        else            printf("recv failed with error: %d\n", WSAGetLastError());    } while( iResult > 0 );    // cleanup    closesocket(ConnectSocket);    WSACleanup();    return 0;}

在windows下用C语言写socket通讯实例