Linux下用c语言实现发送http请求方式可以Get或者Post

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1. [代码]Linux下用c语言实现发送http请求方式可以Get或者Post

#include <stdio.h>

#include <sys/socket.h>

#include <sys/types.h>

#include <time.h>

#include <errno.h>

#include <signal.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <sys/wait.h>

#include <sys/time.h>

#include <netinet/in.h>

#include <arpa/inet.h>

 

#define IPSTR "61.147.124.120"

#define PORT 80

#define BUFSIZE 1024

 

int main(int argc, char **argv)

{

        int sockfd, ret, i, h;

        struct sockaddr_in servaddr;

        char str1[4096], str2[4096], buf[BUFSIZE], *str;

        socklen_t len;

        fd_set   t_set1;

        struct timeval  tv;

 

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

                printf("创建网络连接失败,本线程即将终止---socket error!n");

                exit(0);

        };

 

        bzero(&servaddr, sizeof(servaddr));

        servaddr.sin_family = AF_INET;

        servaddr.sin_port = htons(PORT);

        if (inet_pton(AF_INET, IPSTR, &servaddr.sin_addr) <= 0 ){

                printf("创建网络连接失败,本线程即将终止--inet_pton error!n");

                exit(0);

        };

 

        if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0){

                printf("连接到服务器失败,connect error!n");

                exit(0);

        }

        printf("与远端建立了连接n");

 

        //发送数据

        memset(str2, 0, 4096);

        strcat(str2, "qqCode=474497857");

        str=(char *)malloc(128);

        len = strlen(str2);

        sprintf(str, "%d", len);

 

        memset(str1, 0, 4096);

        strcat(str1, "POST /webservices/qqOnlineWebService.asmx/qqCheckOnline HTTP/1.1n");

        strcat(str1, "Host: www.webxml.com.cnn");

        strcat(str1, "Content-Type: application/x-www-form-urlencodedn");

        strcat(str1, "Content-Length: ");

        strcat(str1, str);

        strcat(str1, "nn");

 

        strcat(str1, str2);

        strcat(str1, "rnrn");

        printf("%sn",str1);

 

        ret = write(sockfd,str1,strlen(str1));

        if (ret < 0) {

                printf("发送失败！错误代码是%d，错误信息是'%s'n",errno,strerror(errno));

                exit(0);

        }else{

                printf("消息发送成功，共发送了%d个字节！nn", ret);

        }

 

        FD_ZERO(&t_set1);

        FD_SET(sockfd, &t_set1);

 

        while(1){

                sleep(2);

                tv.tv_sec= 0;

                tv.tv_usec= 0;

                h= 0;

                printf("--------------->1");

                h= select(sockfd +1, &t_set1, NULL, NULL, &tv);

                printf("--------------->2");

 

                //if (h == 0) continue;

                if (h < 0) {

                        close(sockfd);

                        printf("在读取数据报文时SELECT检测到异常，该异常导致线程终止！n");

                        return -1;

                };

 

                if (h > 0){

                        memset(buf, 0, 4096);

                        i= read(sockfd, buf, 4095);

                        if (i==0){

                                close(sockfd);

                                printf("读取数据报文时发现远端关闭，该线程终止！n");

                                return -1;

                        }

 

                        printf("%sn", buf);

                }

        }

        close(sockfd);

 

 

        return 0;

}