TUGAS 3 - Membuat Aplikasi Currency Converter Online Menggunakan API JSON

Achmad Zidan Akbar

05111840000005 

1. Buat akun pada web penyedia Currency API

daftar pada alamat berikut : https://free.currencyconverterapi.com/

sehingga mendapat api key yang selanjutnya akan digunakan.

2. Buat New Project 

Ubah Nama project menjadi CurrencyExchange

3. Desain Antarmuka.

Menggunakan widget yang telah tersedia pada toolbox.

4. Code

Terdapat kelas yang dibuat untuk mengakomodir Koneksi API. yaitu ApiConn.

	using System;
	using System.Collections.Generic;
	using System.Text;
	using System.Diagnostics;
	using System.Net;
	using Newtonsoft.Json;
	using Newtonsoft.Json.Linq;
	namespace CurrencyExchange
	{
	class ApiConn
	{
	private string all_curr_url = "https://free.currconv.com/api/v7/currencies?apiKey=a0cc285385352baf9649";
	IDictionary<string, string> numberNames = new Dictionary<string, string>();
	//<id,currencySymbol
	public ApiConn()
	{
	Debug.WriteLine("Api conn created");
	getAllCurrency();
	getCurrencyRate("USD", "PHP");
	}
	public JToken getAllCurrency()
	{
	string json_str = new WebClient().DownloadString(all_curr_url);
	Debug.WriteLine(json_str);
	JObject o = JObject.Parse(json_str);
	Debug.WriteLine(o["results"]["ALL"]);
	JToken res_o = o["results"];
	string coba = "IDR - I Dont know";
	Debug.WriteLine(coba.Substring(0,3));
	Debug.WriteLine(res_o[coba.Substring(0, 3)]);
	return res_o;
	}
	public Double getCurrencyRate(string from_, string to_)
	{
	string url_api = "https://free.currconv.com/api/v7/convert?q=" + from_ + "_" + to_ +
	"&compact=ultra&apiKey=a0cc285385352baf9649";
	string json_str = new WebClient().DownloadString(url_api);
	var id_convert = from_ + "_" + to_;
	JToken j_o = JToken.Parse(json_str);
	Debug.WriteLine(j_o[id_convert]);
	return j_o[id_convert].ToObject<double>();
	}
	}
	}

view raw ApiConn.cs hosted with ❤ by GitHub

Lalu untuk Form1.cs

	using System;
	using System.Collections.Generic;
	using System.ComponentModel;
	using System.Data;
	using System.Drawing;
	using System.Linq;
	using System.Text;
	using System.Threading.Tasks;
	using System.Windows.Forms;
	using System.Diagnostics;
	using System.Globalization;
	using Newtonsoft.Json;
	using Newtonsoft.Json.Linq;
	namespace CurrencyExchange
	{
	public partial class Form1 : Form
	{
	private ApiConn api_connection;
	private JToken list_cur;
	public Form1()
	{
	InitializeComponent();
	api_connection = new ApiConn();
	list_cur = api_connection.getAllCurrency();
	addCurrencyToComboBox();
	resetUI();
	}
	private void resetUI()
	{
	this.curr1_label.Text = "";
	this.curr2_label.Text = "";
	this.curr2_name_label.Text = "";
	}
	private void addCurrencyToComboBox()
	{
	foreach (var cur_item in list_cur)
	{
	foreach (var curr_detail_item in cur_item)
	{
	string curr_name = curr_detail_item["id"] + " - " + curr_detail_item["currencyName"];
	this.curr1_comboBox.Items.Add(curr_name);
	this.curr2_comboBox.Items.Add(curr_name);
	//Debug.WriteLine(curr_name);
	}
	}
	}
	private void curr2_label_Click(object sender, EventArgs e)
	{
	Console.WriteLine("Api conn created");
	}
	private void konversi_button_Click(object sender, EventArgs e)
	{
	if (this.curr1_comboBox.SelectedItem == null || this.curr2_comboBox.SelectedItem == null)
	{
	Debug.WriteLine("BELUM PILIH");
	return;
	}
	string from = this.curr1_comboBox.SelectedItem.ToString().Substring(0, 3);
	string to = this.curr2_comboBox.SelectedItem.ToString().Substring(0,3);
	double rate = api_connection.getCurrencyRate(from, to);
	double conv_res = Double.Parse(input_curr_textbox.Text) * rate;
	Debug.WriteLine("HASIL ", conv_res);
	this.curr1_label.Text = Double.Parse(input_curr_textbox.Text).ToString("C3", CultureInfo.CurrentCulture).Substring(1) + " " + curr1_comboBox.SelectedItem.ToString().Substring(6) + " =";
	this.curr2_label.Text = conv_res.ToString("C3", CultureInfo.CurrentCulture).Substring(1);
	this.curr2_name_label.Text = curr2_comboBox.SelectedItem.ToString().Substring(6) + "s";
	this.curr_rate.Text = "1 " + curr1_comboBox.SelectedItem.ToString().Substring(0, 3) + " = " + rate.ToString("C5", CultureInfo.CurrentCulture).Substring(1) + " "
	+ curr2_comboBox.SelectedItem.ToString().Substring(0, 3);
	}
	private void curr1_comboBox_SelectedIndexChanged(object sender, EventArgs e)
	{
	this.symbol_curr_label.Text = list_cur[this.curr1_comboBox.SelectedItem.ToString().Substring(0, 3)]["currencySymbol"].ToString();
	}
	}
	}

view raw Form1.cs hosted with ❤ by GitHub

5. Demo Aplikasi