Can the GET and POST methods be used more than once within a server

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Hello

I'm using snorkel embedded web-server, in which the client (browser) submits a mobile-number into the form in order to be processed within the server, and to generate a QR code, which will finally be displayed on the client-side (browser).

Of course, I've used the GET and POST methods to get the mobile-number from the client, and to post it to the server, respectively.
my question are:
1- how can I display the generated QR code within the same server on the client-side? (I've already created a function called dispQR that display the QR code image file)
2- can I use a POST method again within the same server?

C++

<pre lang="xml">#pragma hdrstop
#pragma argsused

#include <tchar.h>
#include <iostream.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include "snorkel.h"
#include <string.h>
#include <windows.h>
#include <tchar.h>
#include <math.h>
#include<string>
#include<sstream>
using namespace std;


 //***********************************************************
/*example, overloads a form URL and its corresponding POST*/

char szmobilenumber[80];

char szForm[] =        /*content buffer-containing form*/
  { "<html>\r\n<body>\r\n"
    "<form method=\"post\" action=\"postform.html\">\r\n"
    "Mobile Number:\r\n"
    "<input type=\"text\" name=\"mobilenumber\">\r\n"
    "<br>\r\n"
    "<input type=\"submit\" value=\"submit\">\r\n"
    "</form>\r\n" "</body>\r\n</html>\r\n"
  };

//================================================================================
call_status_t
postform (snorkel_obj_t http,    //read environment from this object
          snorkel_obj_t outstream)       // write data to the output stream

  {
  
    if (snorkel_obj_get(http, snorkel_attrib_post, "mobilenumber", szmobilenumber,sizeof (szmobilenumber)) != SNORKEL_SUCCESS)
          return HTTP_ERROR;


     snorkel_printf (outstream,"<html><body>your mobile number is %s</body></html>",szmobilenumber);
    return HTTP_SUCCESS;
  }
//===============================================================================
call_status_t
dispQR (snorkel_obj_t outstream)
{
       snorkel_printf (outstream,
                      "<html><body><img src=file:///webcontent/QR4.jpg>"
                      "</img></body></html>\r\n");
}
//================================================================================
void syntax (char *pszProg)
 {
   fprintf (stderr, "syntax error:\n");
   fprintf (stderr, "%s [-p <port>] [-l <log>]\n", pszProg);
   exit (1);
  }


void main (int argc, char *argv[])
   {
     int i = 1;
     int port = 8080;
     char *pszIndex = 0;
     char *pszLog = 0;
     char szExit[10];
     snorkel_obj_t logobj = 0;
     snorkel_obj_t http = 0;
     snorkel_obj_t outstream;

     for (; i < argc; i++)
     {
      if (argv[i][0] == '-' || argv[i][0] == '/')
        {
          char carg = argv[i][1];

          switch (carg)
           {
            case 'p':
             port = atoi (argv[i + 1]);
             i++;
             break;

            case 'l':
             pszLog = argv[i + 1];
              i++;
              break;

             default:
              syntax (argv[0]);
              break;
            }
         }
     }
/*
 *
 * create a log file object
 * for logging
 *
 */

 if (pszLog)
  {
   logobj = snorkel_obj_create (snorkel_obj_log, pszLog);
   if (!logobj)
     {
       perror ("could not create log file\n");
       exit (1);
      }
    snorkel_debug (1);
   }

/*
 *
 * initialize the API
 *
 */
if (snorkel_init () != SNORKEL_SUCCESS)
 {
   perror ("could not initialize snorkel\n");
   exit (1);
 }

/*
 *
 * create our server object
 *
 */
http = snorkel_obj_create (snorkel_obj_server, 4, NULL);
if (!http)
  {
    perror ("could not create http server\n");
    exit (1);
  }

/*
 *
 * set up our listener
 *
 */
 if (snorkel_obj_set (http,snorkel_attrib_listener,port, 0) != SNORKEL_SUCCESS)
    {
      perror ("could not establish listener\n");
      snorkel_obj_destroy (http);
      if (logobj)
         snorkel_obj_destroy (logobj);
      exit (1);
     }

 if (snorkel_obj_set(http, snorkel_attrib_ipvers, IPVERS_IPV4,SOCK_SET) != SNORKEL_SUCCESS)
    {
      fprintf (stderr, "error could not set ip version\n");
      exit (1);
     }

  //LISTENING ON ANOTHER PORT
  //-------------------------
  if (snorkel_obj_set (http,snorkel_attrib_listener,7021, 0) != SNORKEL_SUCCESS)
    {
      perror ("could not establish listener\n");
      snorkel_obj_destroy (http);
      if (logobj)
         snorkel_obj_destroy (logobj);
      exit (1);
     }
/*
 *
 * overload some URLs
 *
 */
 if (snorkel_obj_set (http, snorkel_attrib_uri_content, GET,   /* method */
                      "/index.html",   /* URL to overload */
                       szForm,  /* pointer to content buffer */
                       SNORKEL_STORE_AS_REF     /* do not duplicate */
  ) != SNORKEL_SUCCESS)
    {
        perror ("could not overload index.html");
        snorkel_obj_destroy (http);
        if (logobj)
          snorkel_obj_destroy (logobj);
        exit (1);
     }


 if (snorkel_obj_set (http,snorkel_attrib_uri, POST,"/postform.html",contenttype_text,postform) != SNORKEL_SUCCESS)
    {
      perror ("could not overload postform.html");
      snorkel_obj_destroy (http);
      if (logobj)
        snorkel_obj_destroy (logobj);
      exit (1);
     }



 fprintf (stderr,"\n\n[HTTP] starting on port %d....", port);

 if (pszLog)
  {
   fprintf (stderr,"\n[HTTP] logging messages to %s\n", pszLog);
  }
 if (snorkel_obj_start (http) != SNORKEL_SUCCESS)
   {
     perror ("could not start server\n");
     snorkel_obj_destroy (http);
     if (logobj)
        snorkel_obj_destroy (logobj);
      exit (1);
    }


 fprintf (stderr, "\n[HTTP] started.\n\n"
                "--hit enter to terminate--\n");
 fgets (szExit, sizeof (szExit), stdin);



 if(szmobilenumber[0] == '\0')
  {
   cout<<"No Number was entered";
   getch();
   exit(0);
  }
 else
  {
   cout<<"\nNumber Submitted by the Client: "<<szmobilenumber<<"\n\n";

                 cout<<"Generate QR code Process...";
  }


 //fprintf (stderr, "[HTTP] bye\n");
 snorkel_obj_destroy (http);
 if (logobj)
    snorkel_obj_destroy (logobj);

 //exit (0);

   getch();

}
//==============================================================================

Any help is really appreciated.
Regards.

Posted 12-Jun-15 11:56am

raniam

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