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How to draw Unicode characters in a PDF in Xamarin

Platform: Xamarin.Forms |
Control: PDF |
Published Date: November 12, 2018 |
Last Revised Date: April 25, 2019
Tags: pdf, xamarin, unicode, draw

Syncfusion Essential PDF is a Xamarin PDF library used to create, read, and edit PDF documents. Using this library, you can draw the Unicode characters in the PDF document in Xamarin.

Steps to draw Unicode character in PDF in Xamarin programmatically:

  1. Create a new C# Xamarin.Forms application project. Create new Xamarin.Forms application
  2. Select a project template and required platforms to deploy the application. In this application, to share the portable assemblies across multiple platforms, the .NET Standard code sharing strategy has been selected. For more details about code sharing, refer here.
Note:

If .NET Standard is not available in the code sharing strategy, the Portable Class Library (PCL) can be selected.

Select Blank Application

 

  1. Install the Syncfusion.Xamarin.PDF NuGet package as a reference to your Portable/NetStandard project from NuGet.org. Install required Nuget packages
  2. Add new Forms XAML page in portable project if there is no XAML page is defined in the App class. Otherwise, proceed to the next step.
  1. To add a new XAML page, right-click the project and select Add > New Item and add a Forms XAML page from the list. Name it as MainXamlPage.
  2. In App class of portable project (App.cs), replace the existing constructor of App class with the following code snippet, which invokes the MainXamlPage.
    public App()
    {
        //The root page of your application
        MainPage = new MainXamlPage();
    }
    

 

  1. In the MainXamlPage.xaml, add new button as follows.
    <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                 xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                 x:Class="GettingStarted. MainXamlPage">
    <StackLayout VerticalOptions="Center">
     
    <Button Text="Generate PDF Document" Clicked="OnButtonClicked"  HorizontalOptions="Center" VerticalOptions="Center"/>
     
    </StackLayout>
    </ContentPage>
    

 

  1. Include the following namespaces in the MainXamlPage.xaml.cs file.
    using Syncfusion.Pdf;
    using Syncfusion.Pdf.Graphics;
    using Syncfusion.Drawing;
    

 

  1. Add a new folder and name it as Assets and include the supported font file into this folder, and set Build Action to Embedded resource. font
  2. Include the following code snippet in the click event of the button in MainXamlPage.xaml.cs to draw the Unicode text to the PDF file and save it in a stream.
    //Create a new PDF document
    PdfDocument document = new PdfDocument();
     
    //Add a new PDF page
    PdfPage page = document.Pages.Add();
     
    //Get the font file as stream
    Stream fontStream = typeof(MainPage).GetTypeInfo().Assembly.GetManifestResourceStream("UnicodeText.Assets.arial.ttf");
     
    //Create a new PdfTrueTypeFont instance
    PdfTrueTypeFont font = new PdfTrueTypeFont(fontStream, 14);
     
    //Draw the Unicode text to PDF page
    page.Graphics.DrawString("Hello World! $ @ # €", font, PdfBrushes.Black, PointF.Empty);
     
    MemoryStream stream = new MemoryStream();
     
    //Save the document
    document.Save(stream);
     
    //Close the document
    document.Close(true);
     
    stream.Position = 0;
     
    //Save the stream as a file in the device and invoke it for viewing
    Xamarin.Forms.DependencyService.Get<ISave>().SaveAndView("Output.pdf", "application/pdf", stream);
    

 

  1. Download the helper files from this link and add them into the mentioned project. These helper files saves the stream as a physical file and open the file for viewing.

Project

File Name

Summary

Portable project

ISave.cs

Represent the base interface for save operation.

iOS Project

SaveIOS.cs

Save implementation for iOS device.

PreviewControllerDS.cs

Helper class for viewing the PDF file in iOS device.

Android project

SaveAndroid.cs

Save implementation for Android device.

WinPhone project

SaveWinPhone.cs

Save implementation for Windows Phone device.

UWP project

SaveWindows.cs

Save implementation for UWP device.

Windows (8.1) project

SaveWindows81.cs

Save implementation for WinRT device.

 

Note:

Introduced a new runtime permission model for the Android SDK version 23 and above. So, include the following code for enabling the Android file provider to save and view the generated PDF document.

  • Create a new XML file with the name of provider_path.xml under the Android project Resources folder and add the following code in it. Eg: Resources/xml/provider_path.xml
    <?xml version="1.0" encoding="UTF-8" ?>
    <paths xmlns:android="http://schemas.android.com/apk/res/android">
      <external-path name="external_files" path="."/>
    </paths>
    

 

  • Add the following code to the AndroidManifest.xml file located under Properties/AndroidManifest.xml.
    <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.InsertImage">
     <uses-sdk android:minSdkVersion="19" android:targetSdkVersion="27" />
     <application android:label="InsertImage.Android">
        <provider android:name="android.support.v4.content.FileProvider"
              android:authorities="${applicationId}.provider"
              android:exported="false"
              android:grantUriPermissions="true">
          <meta-data android:name="android.support.FILE_PROVIDER_PATHS"
                     android:resource="@xml/provider_paths" />
        </provider>
      </application>
    </manifest>
    

 

  1. Compile and execute the application.

By executing the program, you will get the PDF document as follows. UnicodeText

Download the complete work sample from UnicodeText.zip

Note:

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.

 

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