C语言HTTP客户端如何访问网页

一个简单的HTTP协议客户端源代码

#include

#include 

#include

typedef struct{

char line[256];

char head[256];

char body[256];

}message;

void main(){

    int num;

    SOCKET sfd;

    WSADATA wsa;

    struct sockaddr_in serv;

    message req;

    char sndBuf[1024], rcvBuf[1024];

    WSAStartup(MAKEWORD(2,1),&wsa);

    if((sfd=socket(AF_INET,SOCK_STREAM,0))<0){

        perror("socket error!");

        exit(1);

    }

    memset(&serv,0,sizeof(serv));

    serv.sin_family=AF_INET;

    serv.sin_port=htons(80);

    //BING 70.37.92.127

    //BAIDU 115.239.210.26

    //baidu api 180.149.132.118 

    //google 74.125.31.99

    serv.sin_addr.S_un.S_addr=inet_addr("74.125.31.99");

    if((connect(sfd,(struct sockaddr *)&serv,sizeof(serv)))<0){

        perror("connet error!");

        exit(1);

    }

    memset(sndBuf,0,1024);

    memset(rcvBuf,0,1024);

    strcpy(req.line,"GET / HTTP/1.0\r\n");

    strcat(sndBuf,req.line);

    strcpy(req.head,"\r\n");

    strcat(sndBuf,req.head);

    puts(sndBuf);

    if((num=send(sfd,sndBuf,1024,0))<0){

        perror("send error!");

        exit(1);

    }

    puts("send success!\n");

    do{

        if((num=recv(sfd,rcvBuf,1024,0))<0){

        perror("recv error!");

        exit(1);

    }

    else if(num>0){

        printf("%s",rcvBuf);

        memset(rcvBuf,0,1024);

    }

    }while(num>0);

    puts("\nread success!\n");

    closesocket(sfd);

    WSACleanup();

    }