Maui for Android OCR project Using latest maui and android versions

Question

Hello All.

I created new maui project based on an Ocr for Android

example. And it start build ok but after a while it throw

this error. Please any help to fix this. Thank you.

Build Error

===========

Severity Code Description Project File Line Suppression State

Error (active) Precompiling failed for C:\GitHub\MyOcr\MyOcr\obj\Release\net8.0-android\android-arm64\linked\IronOcr.dll with exit code -1073741819.

Mono Ahead of Time compiler - compiling assembly C:\GitHub\MyOcr\MyOcr\obj\Release\net8.0-android\android-arm64\linked\IronOcr.dll

AOTID B4C955CF-7491-E197-2787-A371D120EF7B

Using profile data file 'C:\Users\haviv.nuget\packages\microsoft.maui.controls.build.tasks\8.0.40\buildTransitive\netstandard2.0\maui.aotprofile'

Using profile data file 'C:\Users\haviv.nuget\packages\microsoft.maui.controls.build.tasks\8.0.40\buildTransitive\netstandard2.0\maui-blazor.aotprofile'

Could not load signature of Azure.<e8b4f7ea-6ebf-426d-a24f-4362bcc9815f>AzureCoreExtensions:ToObject due to: Could not load file or assembly

'System.Memory.Data, Version=1.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies.

MyOcr (net8.0-android) C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.113\targets\Microsoft.Android.Sdk.Aot.targets 109

              ================ MyOcr PROJECT =================

MainPage.xaml.cs

================

using IronOcr;

namespace MyOcr

{

public partial class MainPage : ContentPage

{

    // Initialize IronTesseract once in a class

    private IronTesseract ocrTesseract = new IronTesseract();

    public MainPage()

    {

        InitializeComponent();

        // Apply License key

        IronOcr.License.LicenseKey = "IRONOCR.MYLICENSE.KEY.1EF01";

    }

    private async void ReadFileOnImport(object sender, EventArgs e)

    {

        try

        {

            var options = new PickOptions

            {

                PickerTitle = "Please select a file"

            };

            var result = await FilePicker.PickAsync(options);

            if (result != null)

            {

                using var stream = await result.OpenReadAsync();

                // Instantiate OcrInput

                using var ocrInput = new OcrInput();

                // Load image stream

                ocrInput.LoadImage(stream);

                // Perform OCR

                var ocrResult = ocrTesseract.Read(ocrInput);

                OutputText.Text = ocrResult.Text;

            }

        }

        catch (Exception ex)

        {

            // Handle exceptions

            System.Diagnostics.Debug.WriteLine(ex);

        }

    }

}

}

MainPage.xaml

=============

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"

         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

         x:Class="MyOcr.MainPage">

<Grid>

    <Grid.RowDefinitions>

        <RowDefinition Height="Auto"/>

        <RowDefinition Height="*"/>

    </Grid.RowDefinitions>

    <Button

    Text="Import File"

    Clicked="ReadFileOnImport"

    Grid.Row="0"

    HorizontalOptions="Center"

    Margin="20, 20, 20, 10"/>

    <ScrollView

    Grid.Row="1"

    BackgroundColor="LightGray"

    Padding="10"

    Margin="10, 10, 10, 30">

        <Label x:Name="OutputText"/>

    </ScrollView>

</Grid>

</ContentPage>

MyOcr.csproj

============

<Project Sdk="Microsoft.NET.Sdk">

<PropertyGroup>

	<TargetFrameworks>net8.0-android</TargetFrameworks>

            <!-- <TargetFrameworks>net8.0-ios;net8.0-maccatalyst</TargetFrameworks> -->

	<!-- <TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net8.0-windows10.0.19041.0</TargetFrameworks> --> 

	<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->

	<!-- <TargetFrameworks>$(TargetFrameworks);net8.0-tizen</TargetFrameworks> -->

	<!-- Note for MacCatalyst:

	The default runtime is maccatalyst-x64, except in Release config, in which case the default is maccatalyst-x64;maccatalyst-arm64.

	When specifying both architectures, use the plural <RuntimeIdentifiers> instead of the singular <RuntimeIdentifier>.

	The Mac App Store will NOT accept apps with ONLY maccatalyst-arm64 indicated;

	either BOTH runtimes must be indicated or ONLY macatalyst-x64. -->

	<!-- For example: <RuntimeIdentifiers>maccatalyst-x64;maccatalyst-arm64</RuntimeIdentifiers> -->

	<OutputType>Exe</OutputType>

	<RootNamespace>MyOcr</RootNamespace>

	<UseMaui>true</UseMaui>

	<SingleProject>true</SingleProject>

	<ImplicitUsings>enable</ImplicitUsings>

	<Nullable>enable</Nullable>

	<!-- Display name -->

	<ApplicationTitle>MyOcr</ApplicationTitle>

	<!-- App Identifier -->

	<ApplicationId>com.companyname.myocr</ApplicationId>

	<!-- Versions -->

	<ApplicationDisplayVersion>1.0</ApplicationDisplayVersion>

	<ApplicationVersion>1</ApplicationVersion>

	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">11.0</SupportedOSPlatformVersion>

	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.1</SupportedOSPlatformVersion>

	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>

	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>

	<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>

	<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>

</PropertyGroup>

<ItemGroup>

	<!-- App Icon -->

	<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />

	<!-- Splash Screen -->

	<MauiSplashScreen Include="Resources\Splash\splash.svg" Color="#512BD4" BaseSize="128,128" />

	<!-- Images -->

	<MauiImage Include="Resources\Images\*" />

	<MauiImage Update="Resources\Images\dotnet_bot.png" Resize="True" BaseSize="300,185" />

	<!-- Custom Fonts -->

	<MauiFont Include="Resources\Fonts\*" />

	<!-- Raw Assets (also remove the "Resources\Raw" prefix) -->

	<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />

</ItemGroup>

<ItemGroup>

	<PackageReference Include="IronOcr.Android" Version="2024.6.3" />

	<PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />

	<PackageReference Include="Microsoft.Maui.Controls.Compatibility" Version="$(MauiVersion)" />

	<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="8.0.0" />

</ItemGroup>

<ItemGroup>

	<PackageReference Include="IronOcr.Android" Version="2024.6.3" />

	<!-- <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="7.0.0" /> -->

</ItemGroup>

</Project>

Answer 1

Hello,

Issues due to third-party controls are not currently supported on Microsoft Q&A. Therefore, it is more recommended that you send this back to the plugin's official repository or forum for support.

Best Regards,

Alec Liu.

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