c++ 构造http post 发文件

直接看代码#include <sys/types.h>

#include <sys/socket.h>

#include <arpa/inet.h>

#include <iostream>

#include <string.h>

#include <netdb.h>

#include <cerrno>

using namespace std;

std::string get_file_contents(const char *filename)

{

  std::FILE *fp = std::fopen(filename, "rb");

  if (fp)

  {

    std::string contents;

    std::fseek(fp, 0, SEEK_END);

    contents.resize(std::ftell(fp));

    std::rewind(fp);

    std::fread(&contents[0], 1, contents.size(), fp);

    std::fclose(fp);

    return(contents);

  }

  throw(errno);

}

int request(char* hostname, char* api,string & content)

{

    //鲁玫炉socket

    struct hostent* host_addr = gethostbyname(hostname);

    if (host_addr == NULL)

    {

        cout<<"Unable to locate host"<<endl;

        return -103;

    }

    sockaddr_in sin;

    sin.sin_family = AF_INET;

    sin.sin_port = htons((unsigned short)80);

    sin.sin_addr=  *((struct in_addr *)host_addr->h_addr);

    bzero(&(sin.sin_zero),8);

    int sock = socket(AF_INET, SOCK_STREAM, 0);

    if (sock == -1)

    {

        return -100;

    }

    if (connect(sock, (struct sockaddr *)&sin, sizeof(struct sockaddr) ) == -1)

    {

        cout<<"connect failed"<<endl;

        return -101;

    }

    //鲁玫炉路垄脣脨息

    char send_str[2048] = {0};

    //头脨息

    strcat(send_str, "POST ");

    strcat(send_str, api);

    strcat(send_str, " HTTP/1.1\r\n");

    strcat(send_str, "Host: ");

    strcat(send_str, hostname);

    strcat(send_str, "\r\n");

    //strcat(send_str, "Connection: keep-alive\r\n");

    char endsss[190] = {0};

    strcat(endsss,"------WebKitFormBoundarybZRmyZBq9p09AotO\r\n");

    strcat(endsss,"Content-Disposition: form-data; name=\"file\"; filename=\"/home/heida/test/1152_648.png\"\r\n");

    strcat(endsss,"Content-Type: application/octet-stream\r\n\r\n");

    char ends[190] = {0};

    strcat(ends, "\r\n------WebKitFormBoundarybZRmyZBq9p09AotO--\r\n");

    char content_header[100];

    sprintf(content_header,"Content-Length: %d\r\n",content.size()+strlen(endsss)+strlen(ends));

    strcat(send_str, content_header);

    strcat(send_str, "Cache-Control: no-cache\r\n");

   // strcat(send_str, "Origin: http://yyfs.yy.com\r\n");
  //  strcat(send_str, "Upgrade-Insecure-Requests: 1\r\n");

   // strcat(send_str, "User-Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/15.0.849.0 Safari/535.1\r\n");

    strcat(send_str, "Content-Type: multipart/form-data; boundary=----WebKitFormBoundarybZRmyZBq9p09AotO\r\n");

    strcat(send_str, "Accept: */*\r\n");

    //strcat(send_str, "Referer: http://yyfs.yy.com/\r\n");
    strcat(send_str, "Accept-Encoding: gzip,deflate,sdch\r\n");

    strcat(send_str, "Accept-Language: zh-CN,zh;q=0.8\r\n");

    //strcat(send_str,"Expect: 100-continue\r\n");    

    //脛脠脨息

    strcat(send_str, "\r\n\r\n");

//    strcat(send_str,"------WebKitFormBoundarybZRmyZBq9p09AotO\r\n");

  //  strcat(send_str,"Content-Disposition: form-data; name=\"type\"\r\n\r\n");

   // strcat(send_str, "\r\n");

//    strcat(send_str, "HTTP/1.1 100 Continue\r\n");

  //  strcat(send_str,"Content-Transfer-Encoding: binary\r\n");

    cout<<send_str<<endl;    

    cout<<endsss<<endl;

    if (write(sock, send_str, strlen(send_str)) == -1)

    {

        cout<<"send failed"<<endl;

        return -101;

    }

    if (write(sock, endsss, strlen(endsss)) == -1)

     {

        cout<<"send failed"<<endl;

        return -101;

     }

    cout<<content.c_str()<<endl;

    if (write(sock, content.c_str(), content.size()) == -1)

    {

       cout<<"send failed"<<endl;

       return -1;

    }

    cout<<ends<<endl;

    if (write(sock, ends, strlen(ends)) == -1)

    {

      cout<<"send failed"<<endl;

      return -1;

    }

    //禄帽碌禄脴脜垄

    char recv_str[4096] = {0};

    if (recv(sock, recv_str, sizeof(recv_str), 0) == -1)

    {

        cout<<"recv failed"<<endl;

        return -101;

    }

    cout<<recv_str<<endl;

    return 0;

}

int main()

{

    std::string files =  get_file_contents("1152_648.png");

    cout<<files.size()<<endl;

    request("yswdd.com","http://yujds.com/FileUploadDownload/uploadv2_t.php?cookie=ss",files);

    return 0;

}