Question

我尝试使用Windows 10 IoT核心C ++后台应用程序（基于the MSFT IoT templates）。

我的方案涉及创建利用现有托管（C＃）运行时组件的本机（C ++）后台应用程序。我可以在Visual Studio中创建这样的解决方案，它可以很好地编译和部署到物联网设备。

但是，当我运行应用程序时，无论何时使用托管组件，我都会看到这样的运行时异常：

Exception thrown at 0x76C92052 in backgroundTaskHost.exe: Microsoft C++ 
exception: Platform::ClassNotRegisteredException ^ at memory location 
0x02B0F4A8. HRESULT:0x80040154 Class not registered

WinRT information: Class not registered

Stack trace:
[External Code]
backgroundapplicationcpp.dll!BackgroundApplicationCpp::StartupTask::
[Windows::ApplicationModel::Background::IBackgroundTask]::Run
(Windows::ApplicationModel::Background::IBackgroundTaskInstance ^ 
taskInstance) Line 13

Windows运行时的部分承诺是语言的互操作（C ++，C＃，JS，VB）......这种情况适用于标准UWP应用程序代替物联网背景应用程序。

此方案如何适用于后台应用程序???

Answer 1

处理后台应用程序的Visual Studio目标系统部分正在处理项目中的每个库，就好像它是与后台应用程序相同的语言（C ++）。

在这种情况下，托管的运行时组件被视为C ++组件。因此，.NET库不包含在部署中。

下一个版本的Visual Studio应该包含一个修复程序，但在此之前，我将其添加到我的后台应用程序的vcxproj中：

<!-- Workaround for bug in MSBuild regarding Native Background Applications referencing Managed Conponents -->
<PropertyGroup>
  <CopyNuGetImplementations>true</CopyNuGetImplementations>
  <NuGetRuntimeIdentifier>win10-$(PlatformTarget.ToLower())</NuGetRuntimeIdentifier>
</PropertyGroup>
<Target Name="_LocalResolvePrimaryProjectWinmdFiles" BeforeTargets="BeforeGenerateAppxManifest" AfterTargets="_ResolvePrimaryProjectWinmdFiles" Condition="'$(OutputType)' != 'exe' and '$(AppxPackage)' == 'true' AND '$(ContainsStartupTask)' == 'true'">
  <ItemGroup>
    <_AppxWinmdFilesToHarvest Remove="@(_AppxWinmdFilesToHarvest)" />
    <_AppxWinmdFilesToHarvest Include="@(PackagingOutputs)" Condition="'%(PackagingOutputs.Extension)' == '.winmd' and '%(PackagingOutputs.ProjectName)' == '$(ProjectName)' and '%(PackagingOutputs.ResolvedFrom)' != 'GetSDKReferenceFiles'">
      <!-- This covers the Managed Background Application winmd which does NOT have a WinMDFileType value set -->
      <ImageRuntime Condition="'$(PrimaryProjectWinmdImageRuntimeOverride)' == ''">WindowsRuntime 1.4;CLR v4.0.30319</ImageRuntime>
      <!-- This covers the C++ Background Application winmd which does NOT have a WinMDFileType value set -->
      <ImageRuntime Condition="'$(PrimaryProjectWinmdImageRuntimeOverride)' == '' and '@(Language)' == 'C++'">WindowsRuntime 1.4</ImageRuntime>
      <!-- This covers Managed Windows Runtime Component winmds -->
      <ImageRuntime Condition="'$(PrimaryProjectWinmdImageRuntimeOverride)' == '' and '%(PackagingOutputs.WinMDFileType)' == 'Managed'">WindowsRuntime 1.4;CLR v4.0.30319</ImageRuntime>
      <!-- This covers Native Windows Runtime Component winmds -->
      <ImageRuntime Condition="'$(PrimaryProjectWinmdImageRuntimeOverride)' == '' and '%(PackagingOutputs.WinMDFileType)' == 'Native'">WindowsRuntime 1.4</ImageRuntime>
      <!-- This covers Native Windows Runtime Component winmds for DynamicLibrary projects -->
      <ImageRuntime Condition="'$(PrimaryProjectWinmdImageRuntimeOverride)' == '' and '%(PackagingOutputs.ProjectType)' == 'DynamicLibrary'">WindowsRuntime 1.4</ImageRuntime>
      <!-- This provides an override -->
      <ImageRuntime Condition="'$(PrimaryProjectWinmdImageRuntimeOverride)' != ''">$(PrimaryProjectWinmdImageRuntimeOverride)</ImageRuntime>
    </_AppxWinmdFilesToHarvest>
  </ItemGroup>
</Target>

使用该代码块，.NET库与Background Application一起部署，本机代码可以成功访问托管组件。

Windows 10 IoT核心C ++后台应用程序引用C＃运行时组件

1 个答案: