linux c post上传文件,Linux C语言Http POST上传图片

最近需要在嵌入式设备写个POST图片的功能，但是找了很久都没有现成的代码，curl放入嵌入式设备又太臃肿，现在分享一下代码

#include

#include

#include

#include

#include

#include

#include

unsigned long get_file_size(const char *path)

{

unsigned long filesize = -1;

struct stat statbuff;

if(stat(path, &statbuff) < 0){

return filesize;

}else{

filesize = statbuff.st_size;

}

return filesize;

}

int main()

{

int cfd;

int recbytes;

int sin_size;

char buffer[1024]={0};

struct sockaddr_in s_add,c_add;

unsigned short portnum=80;

printf("Hello,welcome to client !rn");

cfd = socket(AF_INET, SOCK_STREAM, 0);

if(-1 == cfd)

{

printf("socket fail ! rn");

return -1;

}

printf("socket ok !rn");

bzero(&s_add,sizeof(struct sockaddr_in));

s_add.sin_family=AF_INET;

s_add.sin_addr.s_addr= inet_addr("127.0.0.1");

s_add.sin_port=htons(portnum);

printf("s_addr = %#x ,port : %#xrn",s_add.sin_addr.s_addr,s_add.sin_port);

if(-1 == connect(cfd,(struct sockaddr *)(&s_add), sizeof(struct sockaddr)))

{

printf("connect fail !rn");

return -1;

}

printf("connect ok !rn");

unsigned long filesize = get_file_size("snap.jpg");

char header[1024];

sprintf(header, "POST /postpic.php HTTP/1.1rnContent-Type: application/octet-streamrnUser-Agent: cctv.mtvrnHost: 127.0.0.1rnContent-Length: %ldrnCache-Control: no-cachernrn", filesize);

printf("%srn", header);

unsigned long totalsize = strlen(header) + filesize;

char* request = (char*)malloc(totalsize);

if (request == NULL){

printf("malloc request fail !rn");

return -1;

}

request[0] = '';

strcat(request, header);

FILE* fp = fopen("snap.jpg", "rb+");

if (fp == NULL){

printf("open file fail!rn");

return -1;

}

int readbyte = fread(request+strlen(request), 1, filesize, fp);

printf("fread return: %dn", readbyte);

if(-1 == write(cfd,request,totalsize))

{

printf("write fail!rn");

return -1;

}

printf("write ok!rn");

if(-1 == (recbytes = read(cfd,buffer,1024)))

{

printf("read data fail !rn");

return -1;

}

printf("read okrnREC:rn");

buffer[recbytes]='';

printf("%srn",buffer);

free(request);

fclose(fp);

close(cfd);

return 0;

}