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

001 #include <stdio.h>
002 #include <sys/socket.h>
003 #include <sys/types.h>
004 #include <time.h>
005 #include <errno.h>
006 #include <signal.h>
007 #include <stdlib.h>
008 #include <string.h>
009 #include <unistd.h>
010 #include <sys/wait.h>
011 #include <sys/time.h>
012 #include <netinet/in.h>
013 #include <arpa/inet.h>
014  
015 #define IPSTR "61.147.124.120"
016 #define PORT 80
017 #define BUFSIZE 1024
018  
019 int main(int argc, char **argv)
020 {
021         int sockfd, ret, i, h;
022         struct sockaddr_in servaddr;
023         char str1[4096], str2[4096], buf[BUFSIZE], *str;
024         socklen_t len;
025         fd_set   t_set1;
026         struct timeval  tv;
027  
028         if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) {
029                 printf("创建网络连接失败,本线程即将终止---socket error!\n");
030                 exit(0);
031         };
032  
033         bzero(&servaddr, sizeof(servaddr));
034         servaddr.sin_family = AF_INET;
035         servaddr.sin_port = htons(PORT);
036         if (inet_pton(AF_INET, IPSTR, &servaddr.sin_addr) <= 0 ){
037                 printf("创建网络连接失败,本线程即将终止--inet_pton error!\n");
038                 exit(0);
039         };
040  
041         if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0){
042                 printf("连接到服务器失败,connect error!\n");
043                 exit(0);
044         }
045         printf("与远端建立了连接\n");
046  
047         //发送数据
048         memset(str2, 0, 4096);
049         strcat(str2, "qqCode=474497857");
050         str=(char *)malloc(128);
051         len = strlen(str2);
052         sprintf(str, "%d", len);
053  
054         memset(str1, 0, 4096);
055         strcat(str1, "POST /webservices/qqOnlineWebService.asmx/qqCheckOnline HTTP/1.1\n");
056         strcat(str1, "Host: www.webxml.com.cn\n");
057         strcat(str1, "Content-Type: application/x-www-form-urlencoded\n");
058         strcat(str1, "Content-Length: ");
059         strcat(str1, str);
060         strcat(str1, "\n\n");
061  
062         strcat(str1, str2);
063         strcat(str1, "\r\n\r\n");
064         printf("%s\n",str1);
065  
066         ret = write(sockfd,str1,strlen(str1));
067         if (ret < 0) {
068                 printf("发送失败！错误代码是%d，错误信息是'%s'\n",errno,strerror(errno));
069                 exit(0);
070         }else{
071                 printf("消息发送成功，共发送了%d个字节！\n\n", ret);
072         }
073  
074         FD_ZERO(&t_set1);
075         FD_SET(sockfd, &t_set1);
076  
077         while(1){
078                 sleep(2);
079                 tv.tv_sec= 0;
080                 tv.tv_usec= 0;
081                 h= 0;
082                 printf("--------------->1");
083                 h= select(sockfd +1, &t_set1, NULL, NULL, &tv);
084                 printf("--------------->2");
085  
086                 //if (h == 0) continue;
087                 if (h < 0) {
088                         close(sockfd);
089                         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");
090                         return -1;
091                 };
092  
093                 if (h > 0){
094                         memset(buf, 0, 4096);
095                         i= read(sockfd, buf, 4095);
096                         if (i==0){
097                                 close(sockfd);
098                                 printf("读取数据报文时发现远端关闭，该线程终止！\n");
099                                 return -1;
100                         }
101  
102                         printf("%s\n", buf);
103                 }
104         }
105         close(sockfd);
106  
107  
108         return 0;
109 }
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