Post image from linux (using c without curl) to php server -

i using v4l2 library on linux, take picture , want send php server via c program. want using socket it. don't know how pass image request . sample code:

int portno =        80; struct sockaddr_in serv_addr; int sockfd, bytes, sent, received, total; sockfd = socket(af_inet, sock_stream, 0); char message[1024],response[4096]; if (sockfd < 0){     printf("error opening socket"); } memset(&serv_addr,0,sizeof(serv_addr)); serv_addr.sin_family = af_inet; serv_addr.sin_port = htons(portno); if(inet_pton(af_inet, const_domain, &serv_addr.sin_addr)<=0){     printf("\n inet_pton error occured\n");     return 1; } if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) {     printf("error connecting"); } char content[1024]; char *contenttemp="image_name=%s"; sprintf(content,contenttemp,imagename); char *headertemp="post %supload.php http/1.0\r\nhost: %s\r\ncontent-type: application/x-www-form-urlencoded\r\ncontent-length: %d\r\n\r\n%s"; sprintf(message,headertemp,service_path,service_host,strlen(content),content); write(sockfd,message,strlen(message)); 

can using way post image server (include name) ? suggest me ? ps: sorry english skill.

you including file name. have include whole image file contents post data stream. forms submitting binary data post request should use multipart/form-data content type. can't use application/x-www-form-urlencoded type.

from html 4.01 specification:

the content type "application/x-www-form-urlencoded" inefficient sending large quantities of binary data or text containing non-ascii characters. content type "multipart/form-data" should used submitting forms contain files, non-ascii data, , binary data.

you adjust code this:

char *filename="file.jpg"; // example uses jpeg  // optionally load file filesystem // though think have in buffer, don't you? file *file = fopen(filename, "rb"); char binary[1024]; // adjust buffer size needs size_t filesize = fread(binary, 1, sizeof(binary), file); // check error here make sure read succeeded fclose(file);  // multipart/form-data post header const char *headertemp = "post %supload.php http/1.0\r\n"                  "host: %s\r\n"                  "content-type: multipart/form-data; boundary=boundary\r\n"                  "content-length: %lu\r\n"                  "\r\n"; // first , part beginning const char *bodytemp =                  "--boundary\r\n"                  "content-disposition: form-data; name=\"file\"; filename=\"%s\"\r\n"                  "content-type: image/jpeg\r\n"                  "content-transfer-encoding: binary\r\n"                  "\r\n"; // , ending const char body2[] = "\r\n"                  "--boundary--\r\n"; char body1[1024]; // adjust buffer size needs // calculate body size, included in content-length header size_t body_size = strlen(body1) + strlen(body2) + filesize; snprintf(header, 1024, headertemp, service_path, service_host, body_size); snprintf(body1, 1024, bodytemp, filename); // should add checking each write return value write(sockfd, header, strlen(header)); write(sockfd, body1, strlen(body1)); write(sockfd, binary, filesize); write(sockfd, body2, strlen(body2)); 

after sending data should read server response, example:

while (1) {     ssize_t result = recv(sockfd, response, sizeof(response), 0);     if (result == 0) {         break;     } else if (result < 0) {         perror("reading socket failed");         break;     }     printf("%s\n", response); } close(sockfd); 

if close socket without waiting response server may complain , return error. should check if response confirms valid request.