ex_httpgetvar2.c

Consider the page "status.cgi" that is being served by the HTTP Server. It contains following HTML line:

Port Pin RA4 = %a04

During processing of this file, the HTTP Server encounters the ‘%a04’ string. After parsing it, the HTTP Server makes a callback to HTTPGetVar(httpInfo, val). The httpInfo->var.get.varRef will have the value HTTP_START_OF_VAR. The main user application implements HTTPGetVar as follows:

#include "projdefs.h"
#include "net\http.h"

ROM char SerialNumberStr[] = "123456SER";

WORD HTTPGetVar(HTTP_INFO* httpInfo, BYTE* val)
{
    BYTE varValue, varGroup, ref;

    varValue = httpInfo->var.get.tagVal;        //Variable Value of requested variable
    varGroup = httpInfo->var.get.tagGroup;      //Variable Group of requested variable
    ref      = httpInfo->var.get.varRef;        //Current callback reference with respect
                                                //to 'var' variable.
    

    //In case requested var not found, set it to NULL character and return HTTP_END_OF_VAR
    *val = '\0';    
    
    //Identify variable group
    if (varGroup == 'a')
    {
        // Identify variable value.
        // Is it RA4 ?
        if ( varValue == 4 )
        {
            // We will simply return ‘1’ if RA4 is high, or ‘0’ if low.
            if ( PORTB_RA4 )
                *val = ‘1’;
            else
                *val = ‘0;

            // Tell HTTP that this is last byte of
            // variable value.
            return HTTP_END_OF_VAR;
        }
        else
            // Check for other variables values...
            //...
        }
    }
}