Xamarin.ESCUtils 1.0.1

Xamarin.Forms Android ESC/POS Bluetooth Printer

Add Nuget Package

dotnet add package Xamarin.ESCUtils --version 1.0.1

Features

• 58, 80mm bluetooth esc/pos printer support
• Bold font support
• Justify text right, left, center
• Print QR Code
• Print Barcode
• Turkish Character Supported

The project is completely open source and open to support. Download the Sample Application for details.

The application has been developed for the current Xamarin.Forms android platform.

Android Manifest Permission

<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

Note:

** Make sure to allow all permissions from application settings before running the project.

Android Mainactivity.cs

[assembly: Xamarin.Forms.Dependency(typeof(BluetoothService))]
[assembly: Xamarin.Forms.Dependency(typeof(EscUtil))]
namespace SampleApp.Droid
...

Xamarin Forms

Init Implementation

using SampleApp.ViewModels;
using Xamarin.Forms;
using XamarinESCUtils.Platforms.Common;
namespace SampleApp
{
    public partial class MainPage : ContentPage
    {
    	private IBlueToothService _blueToothService;
    	private IEscUtil _escUtil;

		public MainPage()
		{
			InitializeComponent();

			_blueToothService = DependencyService.Get<IBlueToothService>();
			_escUtil = DependencyService.Get<IEscUtil>();
		}
	}
}

Get Bluetooth Device List

private List <BluetoothInfo> PrinterList = new List<BluetoothInfo>();
....
...
var list = _blueToothService.GetDeviceList();
foreach (var item in list)
{
	PrinterList.Add(item);
}

Selected Bluetooth Printer

return new Command<object>(async (parameter) =>
{
    try
    {
        if (parameter is BluetoothInfo selectedItem)
        {
            _BluetoothInfo = selectedItem;
        }
    }
    catch (Exception e)
    {
        await App.Current.MainPage.DisplayToastAsync(e.Message);
        throw;
    }
});

Send Printer Data

if (_BluetoothInfo != null)
{
    _blueToothService.ConnectBlueTooth(_BluetoothInfo.Adress);

    _blueToothService.SendData(_escUtil.SetCodeSystem(_escUtil.CodeParse(20))); // utf-8
    _blueToothService.SendData(_escUtil.UnderlineOff());
    _blueToothService.SendData(_escUtil.BoldOn());
    _blueToothService.SendData(_escUtil.AlignCenter());
    _blueToothService.SendData(_escUtil.GetTextBytes("Welcome to XamarinForms.ESCUtils"));
    _blueToothService.SendData(_escUtil.NextLine(1));
    _blueToothService.SendData(_escUtil.BoldOff());
    _blueToothService.SendData(_escUtil.AlignLeft());
    _blueToothService.SendData(_escUtil.GetTextBytes("This is a test output."));
    _blueToothService.SendData(_escUtil.NextLine(1));
    _blueToothService.SendData(_escUtil.AlignRight());
    _blueToothService.SendData(_escUtil.GetTextBytes("Have a nice day :)"));
    _blueToothService.SendData(_escUtil.NextLine(4));
    _blueToothService.SendData(_escUtil.AlignCenter());
    _blueToothService.SendData(_escUtil.GetPrintQrCode($"https://github.com/bestekarx", 3, 1));
    _blueToothService.SendData(_escUtil.NextLine(1));
}

<img src="https://user-images.githubusercontent.com/17545048/227748088-1db14ec9-65f3-40a5-afce-3bb246d0a3c4.jpg" width="400" height="400"> <img src="https://user-images.githubusercontent.com/17545048/227748089-b93d9d18-293d-4dc7-bdbe-1ccfddfe3b4b.jpg" width="400" height="800">