Question

我正在开发Edge中的WebExtension和桌面应用程序之间的本机消息传递。但是无法通过desktopBridge与桌面应用程序进行通信。在下面的代码中，显示了消息框Success，但没有显示消息框Test。

AppServiceResponse desktopBridgeResponse = await this.desktopBridgeConnection.SendMessageAsync(testValueSet);遇到异常“对象引用未设置为对象的实例”。

// AppService.cs
public async void Run(IBackgroundTaskInstance taskInstance)
{
    if (appService.CallerPackageFamilyName == "Microsoft.MicrosoftEdge_8wekyb3d8bbwe") // App service connection from Edge
    {
        appServiceconnection = details.AppServiceConnection;
        appServiceconnection.RequestReceived += OnRequestReceived;

        try
        {
            // Make sure the DesktopApp.exe is in your AppX folder, if not rebuild the solution
            await Windows.ApplicationModel.FullTrustProcessLauncher.LaunchFullTrustProcessForCurrentAppAsync();
        }
        catch (Exception)
        {
            MessageDialog dialog = new MessageDialog("Rebuild the solution and make sure the DesktopApp.exe is in your AppX folder");
            await dialog.ShowAsync();
        }
    }
    else (appService.CallerPackageFamilyName == Windows.ApplicationModel.Package.Current.Id.FamilyName) // App service connection from desktopBridge App
    {
        desktopBridgeConnection = details.AppServiceConnection;
    }
}

private async void OnRequestReceived(AppServiceConnection sender, AppServiceRequestReceivedEventArgs args)
{
    try
    {
        AppServiceResponse desktopBridgeResponse = await this.desktopBridgeConnection.SendMessageAsync(testValueSet);
    }
    catch (Exception e)
    {
        var errorMessage = e.Message;
    }
}

// DesktopApp.cs
[STAThread]
static void Main()
{
    Thread appServiceThread = new Thread(new ThreadStart(InitializeAppServiceConnection));
    appServiceThread.Start();
    Application.Run();
}

static async void InitializeAppServiceConnection()
{
    connection = new AppServiceConnection();
    connection.AppServiceName = "example";
    connection.PackageFamilyName = Package.Current.Id.FamilyName;
    connection.RequestReceived += Connection_RequestReceived;

    AppServiceConnectionStatus status = await connection.OpenAsync();
    if (status != AppServiceConnectionStatus.Success)
    {
        // something went wrong ...
        MessageBox.Show(status.ToString());
    }
    else
    {
        MessageBox.Show("Success");
    }
}

private static void Connection_RequestReceived(AppServiceConnection sender, AppServiceRequestReceivedEventArgs args)
{
    MessageBox.Show("Test");

    string key = args.Request.Message.First().Key;
    string value = args.Request.Message.First().Value.ToString();

}

根据Secure Input，它应该可以工作。

尽管已成功建立与应用程序服务的连接，为什么不输入Connection_RequestReceived()？

任何帮助将不胜感激，谢谢！

更新：通过调试，我发现了以下问题：当应用程序服务从Edge收到消息时，Run()方法将运行到“ Edge连接分支”中。接下来，执行OnRequestReceived()，将消息发送到desktopBridge await this.desktopBridgeConnection.SendMessageAsync(testValueSet)，但是失败。然后，再次执行Run()并运行到“ DesktopBridge连接分支”中。此时，已经定义了desktopBridgeConnection，但为时已晚。

我需要在输入desktopBridgeConnection之前定义OnRequestReceived()，以便可以在OnRequestReceived()中使用它。但是我不知道如何实现。

Answer 1

您需要在OnRequestRecived（）中移动启动Fulltrust进程的代码，并等待启动的进程通过AppServiceConnection连接。然后将命令发送到启动的进程并获取响应并将其发送回页面。

请参阅我的问题和我设计的解决方案here。

基本上，我使用非持久连接。因此，您需要从content.js和background.js删除所有用于连接/断开连接的代码。这样一来，它就一直是无会话的“同步”调用。

祝你好运！

Edge本机消息传递的App Service桌面桥不起作用

1 个答案: