最近由於項目原因,需要自己在c代碼裏面實現http請求並對返回數據進行解析。
現將相關代碼記錄如下
主要代碼:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <unistd.h>
int main(int argc, char *argv[]){
if(argc!=2){
printf("請輸入正確ip\n");
return 1;
}
int sockfd;
int len;
struct sockaddr_in address;
int result;
char httpstring[100];
sprintf(httpstring,"GET / HTTP/1.1\r\n"
"Host: %s\r\n"
"Connection: Close\r\n\r\n",argv[1]);
char ch;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr(argv[1]);
address.sin_port = htons(80);
len = sizeof(address);
result = connect(sockfd,(struct sockaddr *)&address,len);
if(result == -1){
perror("connect error");
return 1;
}
write(sockfd,httpstring,strlen(httpstring));
while(read(sockfd,&ch,1)){
printf("%c", ch);
}
close(sockfd);
printf("\n");
return 0;
}
連接csdn官網示例:
另附返回數據解析代碼:
char sourceData[1024*1024];//原始數據
char lengthTemp[1024*1024];
char desData[1024*1024];//目的數據
char *strTemp;
int iDataLen;
strTemp = strstr(sourceData, "ConTent-Length:");
for(iPos=0;iPos < getLength(strTemp);iPos++)//getLength爲自定義函數
{
if(strTemp[iPos] == '\n' || strTemp[iPos] == '\r')
memcpy(lengthTemp, strTemp+strlen("Content-Length:"), iPos - strlen("Content-Length:"));
printf("長度串:%s\n",lengthTemp);
iDataLen = atoi(lengthTemp);
break;
}
//獲取目的數據
strncpy(desData, sourceData + strlen(sourceData) - iDataLen, sizeof(desData));