在Windows 8手机UI获取调度 [英] Obtaining UI dispatcher in Windows phone 8

问题描述

我一直在开发消耗由非UI线程访问Windows运行时组件（WRC）。一个功能，需要使用访问Windows Phone应用程序的回调一个Windows Phone应用程序。

I have been developing a Windows Phone application that consumes Windows Runtime component(WRC).A function accessed by a non-UI thread,needs to use a callback that access the Windows phone application.

void WControlPointCallback::OnListChange(char *pFriendlyName)
{
    // Callback function to access the UI
    pCallBack->AlertCaller("Message");  
}

起初不使用分派扔

At first without using the Dispatcher it threw

平台:: AccessDeniedException异常。

然后我提到这个，的这个和这个。
我试图从UI获取调度。

Then I referred to this, this and this. I tried to obtain the Dispatcher from the UI.

var dispatcher = Windows.UI.Core.CoreWindow.GetForCurrentThread().Dispatcher;

它扔 System.AccessViolationException 。然后我使用

pDispatcher = Windows::UI::Core::CoreWindow::GetForCurrentThread()->Dispatcher; 

在C ++代码（WRC），而这也将引发平台:: AccessDeniedException异常。

in C++ code(WRC).But this too throws Platform::AccessDeniedException.

如何获取调度的UI在Windows Phone的？

How to obtain the Dispatcher for UI in Windows Phone?

推荐答案

您无法从C ++调度程序的Windows Phone 8的：你需要将呼叫转移到C＃的一面，而不是C ++端UI调度

You can't get the dispatcher from C++ for Windows Phone 8: you need to move the call to the UI dispatcher on the C# side, not the C++ side.

如果你可以做这样的事情：

If you can just do something like this:

class DotNetClass : IWindowsRuntimeInterface
{
    void AlertCaller(string message)
    {
        Deployment.Current.Dispatcher.BeginInvoke(() =>
        {
            MessageBox.Show(message);
        }
    }
}

这篇关于在Windows 8手机UI获取调度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！