Linux下http协议GET通讯的C语言实现
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Linux下http协议GET通讯的C语言实现
from
/uid-21768364-id-187570.html201 1.03
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <unistd.h>
#include <netinet/in.h>
#include <limits.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <ctype.h>int main(int argc, char *argv[]) {
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
int portnumber,nbytes;
char host_addr[256];
char host_file[1024];
char local_file[256];
FILE * fp;
char request[1024];
int send, totalsend;
int i;
char * pt;if(argc!=2)
{
fprintf(stderr,"Usage:%s web-address\a\n",argv[0]);
exit(1);
}
portnumber=80;
strcpy(host_addr,argv[1]);
if((host=gethostbyname(argv[1]))==NULL)/*取得主机IP地址*/
{
fprintf(stderr,"Gethostname error, %s\n",
strerror(errno));
exit(1);
}
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)/*建立SOCKET连接*/
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
}
/* 客户程序填充服务端的资料*/
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(portnumber);
server_addr.sin_addr=*((struct in_addr
*)host->h_addr);/* 客户程序发起连接请求*/
if(connect(sockfd,(struct sockaddr
*)(&server_addr),sizeof(struct sockaddr))==-1)/*连接网站*/
{
fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
exit(1);
}sprintf(request, "GET /%s HTTP/1.1\r\nAccept:
*/*\r\nAccept-Language: zh-cn\r\n\
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)\r\n\
Host: %s:%d\r\nConnection: Close\r\n\r\n", host_file,
host_addr, portnumber);
printf("%s", request);/*准备request，将要发送给主机*//*取得真实的文件名*/
strcpy(local_file, "index.html");
/*发送http请求request*/
send = 0;totalsend = 0;
nbytes=strlen(request);
while(totalsend < nbytes) {
send = write(sockfd, request + totalsend, nbytes - totalsend);
if(send==-1) {printf("send error!%s\n",
strerror(errno));exit(0);}
totalsend+=send;
printf("%d bytes send OK!\n", totalsend);
}fp = fopen(local_file, "a");
if(!fp) {
printf("create file error! %s\n", strerror(errno));
return 0;
}
printf("\nThe following is the response header:\n");
i=0;
/* 连接成功了，接收http响应，response */
while((nbytes=read(sockfd,buffer,1))==1)
{
if(i < 4) {
if(buffer[0] == '\r' || buffer[0] == '\n') i++;
else i = 0;
printf("%c", buffer[0]);/*把http头信息打印在屏幕上*/ }
else {