简单粗暴懒得说，上代码
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#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <string.h>
int ReadHttpStatus(int sock)
{
char c;
char buff[1024]="",*ptr=buff+1;
int bytes_received, status;
printf("Begin Response ..\n");
bytes_received = recv(sock, ptr, 1, 0);
while(bytes_received)
{
if(bytes_received==-1)
{
perror("ReadHttpStatus");
exit(1);
}
if((ptr[-1]=='\r') && (*ptr=='\n' )) break;
ptr++;
bytes_received = recv(sock, ptr, 1, 0);
}
*ptr=0;
ptr=buff+1;
sscanf(ptr,"%*s %d ", &status);
printf("%s\n",ptr);
printf("status=%d\n",status);
printf("End Response ..\n");
return (bytes_received>0)?status:0;
}
//the only filed that it parsed is 'Content-Length'
int ParseHeader(int sock)
{
char c;
char buff[1024]="",*ptr=buff+4;
int bytes_received, status;
bytes_received = recv(sock, ptr, 1, 0);
printf("Begin HEADER ..\n");
while(bytes_received)
{
if(bytes_received==-1)
{
perror("Parse Header");
exit(1);
}
if(
(ptr[-3]=='\r') && (ptr[-2]=='\n' ) &&
(ptr[-1]=='\r') && (*ptr=='\n' )
) break;
ptr++;
bytes_received = recv(sock, ptr, 1, 0);
}
*ptr=0;
ptr=buff+4;
//printf("%s",ptr);
if(bytes_received)
{
ptr=strstr(ptr,"Content-Length:");
if(ptr)
{
sscanf(ptr,"%*s %d",&bytes_received);
}
else
bytes_received=-1; //unknown size
printf("Content-Length: %d\n",bytes_received);
}
printf("End HEADER ..\n");
return bytes_received ;
}
int main(void)
{
char domain[] = "pic.netbian.com", path[]="uploads/allimg/190824/212516-15666531161ade.jpg";
int sock, bytes_received;
char send_data[1024],recv_data[1024], *p;
struct sockaddr_in server_addr;
struct hostent *he;
he = gethostbyname(domain);
if (he == NULL)
{
herror("gethostbyname");
exit(1);
}
if ((sock = socket(AF_INET, SOCK_STREAM, 0))== -1)
{
perror("Socket");
exit(1);
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(80);
server_addr.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(server_addr.sin_zero),8);
printf("Connecting ...\n");
if (connect(sock, (struct sockaddr *)&server_addr,sizeof(struct sockaddr)) == -1)
{
perror("Connect");
exit(1);
}
printf("Sending data ...\n");
snprintf(send_data, sizeof(send_data), "GET /%s HTTP/1.1\r\nHost: %s\r\n\r\n", path, domain);
if(send(sock, send_data, strlen(send_data), 0)==-1)
{
perror("send");
exit(2);
}
printf("Data sent.\n");
//fp=fopen("received_file","wb");
printf("Recieving data...\n\n");
int contentlengh;
if(ReadHttpStatus(sock) && (contentlengh=ParseHeader(sock)))
{
int bytes=0;
FILE* fd=fopen("212516-15666531161ade.jpg","wb");
printf("Saving data...\n\n");
bytes_received = recv(sock, recv_data, 1024, 0);
while(bytes_received)
{
if(bytes_received==-1)
{
perror("recieve");
exit(3);
}
fwrite(recv_data,1,bytes_received,fd);
bytes+=bytes_received;
printf("Bytes recieved: %d from %d\n",bytes,contentlengh);
if(bytes==contentlengh)
break;
bytes_received = recv(sock, recv_data, 1024, 0);
}
fclose(fd);
}
close(sock);
printf("\n\nDone.\n\n");
return 0;
}
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