我可以从 UWP 应用程序的进程外后台任务中启动 FullTrust Win32 应用程序吗？

Question

I needed to read the registry every system login in order to determine whether to launch a notification or not. So I had to create an out-of-process background task with SystemTriggerType.SessionConnected to do this. The background task implementation would look something like this:

public async void Run(IBackgroundTaskInstance taskInstance)
{
    
    Task launchFullTrust = LaunchFullTrustProcessForCurrentAppAsync(); //Windows.ApplicationModel.FullTrustProcessLauncher as an async task
    launchFullTrust.Wait();

    BackgroundTaskDeferral appServiceDeferral = taskInstance.GetDeferral();
    AppServiceTriggerDetails details = taskInstance.TriggerDetails as AppServiceTriggerDetails;
    Connection = details.AppServiceConnection; // AppServiceConnection object
    ...
    // perform data acquisition
}

But because this background process is triggered by the session connectivity, it is guaranteed that taskInstance will not contain AppServiceTriggerDetails , or anything related to the AppServiceTrigger at all. Considering this, is there a way to receive a handle to the AppServiceConnection connection from the background task, and not from the UWP app itself?

Answer 1

To answer the main question if it is possible to launch a FullTrust Win32 app from an out-of-process background task: Yes

But the Win32 app will trigger the OnBackgroundTaskActivated function of the Main UWP application. This means it would be better to continue from said function and obtain a handle to the AppServiceConnection from there. I was hoping to have a way to receive the connection on the background-task itself, but this situation seems workable for me. I am able to continue with this approach.