How to use RailPNRAPI to get PNR Status?

Here I’m sharing the sample code on How to consume API provided by railpnrapi.com to query Indian Railway PNR status:

Register yourself on http://www.railpnrapi.com/ and get/generate API Key & API Secret.

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;

namespace RailPnrAPI_SampleCode
{
    class Program
    {
        static void Main(string[] args)
        {
            //set your credentials
            var apiCreds = new Dictionary
            {
                {“Key”, “”},
                {“Secret”, “”}
            };

         
            var pnr = “1234567890”; //test pnr
            var requestUrlTemplate = “http://railpnrapi.com/api/check_pnr/pnr/”+pnr+”/format/json/pbapikey/” +
                                   apiCreds[“Key”] + “/pbapisign/{0}”;

            //Get All the request parameter
            var paramsSet = new Dictionary
            {
                {“pnr”, pnr},
                {“format”, “json”},
                {“pbapikey”, apiCreds[“Key”]}
            };

            //sort the keys and concat their values
            var inputString = paramsSet.OrderBy(x => x.Key).Select(x => x.Value).Aggregate((a, b) => a + b).ToLower();
         
            //var keyBytes = Encoding.ASCII.GetBytes(apiCreds[“Secret”]);
            var keyBytes = Encoding.ASCII.GetBytes(apiCreds[“Secret”]);

            // compute hash
            var signature = ComputeHMACSHA1(inputString, keyBytes);

            var request = WebRequest.CreateHttp(string.Format(requestUrlTemplate, signature));
            var response = request.GetResponse();
         
            // parse JSON response using Newtonsoft.Json
            dynamic json = JsonConvert.DeserializeObject(new StreamReader(response.GetResponseStream()).ReadToEnd());
         

            // process/display response

            Console.WriteLine(“Response Code: {0}”,json.response_code);
            Console.WriteLine(“PNR: {0}”, json.pnr);
            Console.WriteLine(“Train No.: {0}”, json.train_num);
            Console.WriteLine(“Train Name: {0}”, json.train_name);
            Console.WriteLine(“DOJ: {0}”, json.doj);
            Console.WriteLine(“From Station (Code/Name): {0}/{1}”, json.from_station.code, json.from_station.name);
            Console.WriteLine(“To Station (Code/Name): {0}/{1}”, json.to_station.code, json.to_station.name);
            Console.WriteLine(“Reservation Upto (Code/Name): {0}/{1}”, json.reservation_upto.code, json.reservation_upto.name);
            Console.WriteLine(“Boarding Point (Code/Name): {0}/{1}”, json.boarding_point.code, json.boarding_point.name);
         
            Console.WriteLine(“Class: {0}”, [email protected]);
            Console.WriteLine(“No. of Passengers: {0}”, json.no_of_passengers);
            Console.WriteLine(“Chart Status: {0}”, json.chart_prepared);
            Console.WriteLine();
            Console.WriteLine(“Passengers: n********************************”);
            foreach (var passenger in json.passengers)
            {
                Console.WriteLine(“Passenger #:{0}, Booking Status:{1}, Current Status:{2}”, passenger.sr, passenger.passengers, passenger.current_status);
            }
            Console.WriteLine();
            Console.WriteLine(“********************************”);

            Console.ReadLine();

        }

        private static string ComputeHMACSHA1(string input, byte[] key)
        {
            var myHmacSha1 = new HMACSHA1(key);
            byte[] byteArray = Encoding.ASCII.GetBytes(input);
            var stream = new MemoryStream(byteArray);
            byte[] hashValue = myHmacSha1.ComputeHash(stream);
            return string.Join(“”, Array.ConvertAll(hashValue, b => b.ToString(“x2”)));
        }
    }
}

     Here’s the sample console output:

Sample Code Output

Sample Code in VB
————————


Imports Newtonsoft.Json
Imports System.Collections.Generic
Imports System.IO
Imports System.Linq
Imports System.Net
Imports System.Security.Cryptography
Imports System.Text

Public Class PnrResponse
    Public response_code As String = Nothing
    Public pnr As String = Nothing
    Public train_num As String = Nothing
    Public train_name As String = Nothing
    Public doj As String = Nothing
    Public from_station As Station = Nothing
    Public to_station As Station = Nothing
    Public reservation_upto As Station = Nothing
    Public boarding_point As Station = Nothing
    Public [class] As String = Nothing
    Public no_of_passengers As String = Nothing
    Public chart_prepared As String = Nothing
    Public passengers As List(Of Passenger) = Nothing
    Public [error] As String = Nothing
End Class

Public Class Station
    Public code As String = Nothing
    Public name As String = Nothing
End Class

Public Class Passenger
    Public sr As String = Nothing
    Public booking_status As String = Nothing
    Public current_status As String = Nothing
End Class

Module Module1
    Sub Main(args As String())
        ‘set your credentials
        Dim apiCreds = New Dictionary(Of String, String)() From {
            {“Key”, “”}, _
            {“Secret”, “”} _
        }
        Dim pnr = “1234567890”
        ‘test pnr
        Dim requestUrlTemplate = “http://railpnrapi.com/api/check_pnr/pnr/” + pnr + “/format/json/pbapikey/” + apiCreds(“Key”) + “/pbapisign/{0}”


        ‘Get All the request parameter
        Dim paramsSet = New Dictionary(Of String, String)() From { _
            {“pnr”, pnr}, _
            {“format”, “json”}, _
            {“pbapikey”, apiCreds(“Key”)} _
        }

        ‘sort the keys and concat their values
        Dim inputString = paramsSet.OrderBy(Function(x) x.Key).[Select](Function(x) x.Value).Aggregate(Function(a, b) a + b).ToLower()

        ‘var keyBytes = Encoding.ASCII.GetBytes(apiCreds[“Secret”]);
        Dim keyBytes = Encoding.ASCII.GetBytes(apiCreds(“Secret”))

        ‘ compute hash
        Dim signature = ComputeHMACSHA1(inputString, keyBytes)

        Dim request = WebRequest.CreateHttp(String.Format(requestUrlTemplate, signature))
        Dim response = request.GetResponse()

        ‘ parse JSON response using Newtonsoft.Json
        Dim responseText = New StreamReader(response.GetResponseStream()).ReadToEnd()
        Dim json As PnrResponse = JsonConvert.DeserializeObject(Of PnrResponse)(responseText)


        ‘ process/display response

        Console.WriteLine(“Response Code: {0}”, json.response_code)
        Console.WriteLine(“PNR: {0}”, json.pnr)
        Console.WriteLine(“Train No.: {0}”, json.train_num)
        Console.WriteLine(“Train Name: {0}”, json.train_name)
        Console.WriteLine(“DOJ: {0}”, json.doj)
        Console.WriteLine(“From Station (Code/Name): {0}/{1}”, json.from_station.code, json.from_station.name)
        Console.WriteLine(“To Station (Code/Name): {0}/{1}”, json.to_station.code, json.to_station.name)
        Console.WriteLine(“Reservation Upto (Code/Name): {0}/{1}”, json.reservation_upto.code, json.reservation_upto.name)
        Console.WriteLine(“Boarding Point (Code/Name): {0}/{1}”, json.boarding_point.code, json.boarding_point.name)

        Console.WriteLine(“Class: {0}”, json.[class])
        Console.WriteLine(“No. of Passengers: {0}”, json.no_of_passengers)
        Console.WriteLine(“Chart Status: {0}”, json.chart_prepared)
        Console.WriteLine()
        Console.WriteLine(“Passengers: ” & vbLf & “********************************”)
        For Each passenger In json.passengers
            Console.WriteLine(“Passenger #:{0}, Booking Status:{1}, Current Status:{2}”, passenger.sr, passenger.booking_status, passenger.current_status)
        Next
        Console.WriteLine()
        Console.WriteLine(“********************************”)

        Console.ReadLine()
    End Sub

    Private Function ComputeHMACSHA1(input As String, key As Byte()) As String
        Dim myHmacSha1 = New HMACSHA1(key)
        Dim byteArray As Byte() = Encoding.ASCII.GetBytes(input)
        Dim stream = New MemoryStream(byteArray)
        Dim hashValue As Byte() = myHmacSha1.ComputeHash(stream)
        Return String.Join(“”, Array.ConvertAll(hashValue, Function(b) b.ToString(“x2”)))
    End Function

End Module

——————–


Download Sample Code for C# & VB Here: Sample Codes Rail PNR API


What is API and How to use it?

Have you ever used a library in C#? Yes, that’s an API. An API (Application Programming Interface is something that let’s you interact with something or with an interface.

They are just a set of functions you can call. They have their documentation on what they do, how they behave, what input(s) they need to perform as intended.

For example, using Win32 API you can interact with Windows, using Twitter API you can interact with Twitter… etc. They could be Interacting with Windows as well as Web both.

Its a doorway into the programming model that a company exposes so you can enhance or extend some capability they provide. For example, Facebook wants to help programmers develop applications that work with their platform. So they offer a library that you include with your application to access data in the Facebook system.

Basically you start using an API by downloading it’s library or development kit (SDK), reading it’s Manual (Documentation). Let’s take Facebook for an example. Go to developers.facebook.com. Search for “SDK”. Download the version for your platform. Look at the samples. Try them. Change them to do something slightly different.

Refer to this link for example: https://developers.google.com/maps/documentation/javascript/demogalleryThis demonstrates to the various use of Google Maps API.