处理Silverlight UserControl [英] Handle to Silverlight UserControl

问题描述

我有一个用C ++编写的DLL(Player.dll)，该DLL在内部使用

I've a DLL (Player.dll) written in C++ that internally uses Windows GDI. I've an application (basically a video player) written in Windows Forms, that internally calls APIs from Player.dll to render the actual graphics on screen, using p/invoke technique:

public class ProxyPlayer
{
    [DllImport("Player.dll", CharSet=CharSet.Unicode, EntryPoint="PlayVideo")]
    public static extern void Play(int playerHandle, out TWResult result);

    [DllImport("Player.dll", CharSet=CharSet.Unicode, EntryPoint="PauseVideo")]
    public static extern void Pause(int playerHandle);

    //other methods
}

正在工作.

但是现在，我想使用Silverlight 4.0编写相同的应用程序.如您所知，大多数 Windows GDI 都可以使用HWND在屏幕上渲染图形，这就是为什么我将playerHandle传递给ProxPlayer方法的原因，如您所见. Window Forms的UserControl定义了类型为IntPtr的称为Handle的公共属性，它等效于HWND，因此我将其传递给ProxyPlayer方法.它解决了我的问题.但是Silverlight的UserControl没有任何此类属性.

But now, I want to write the same application using Silverlight 4.0. As you know most Windows GDI works with HWND to render graphics on screen, that is why I pass playerHandle to ProxPlayer methods, as you can see above yourself. Window Forms' UserControl defines a public property called Handle of type IntPtr which is equivalent to HWND, so I pass that to ProxyPlayer methods. It solved my problem. But Silverlight's UserControl doesn't have any such property.

所以我的问题基本上是，我将如何处理Silverlight控件?因为没有它，我无法从Player.dll调用API.但是我必须从中调用APS.我没有其他选择，因为DLL是真正的引擎，它实际上处理与解释大量数据然后呈现它们有关的所有事情.因此，请提出适合我要求的解决方案！

So my question basically is, how would I get handle to my silverlight control? Because without it, I cannot call APIs from Player.dll. But I've to call APS from it. I don't have any other options, as the DLL is actual engine that does literally everything related to interpreting a huge amount of data and then rendering them. So please suggest me solution that fits in with my requirement!

注意:假定我的silverlight应用程序将始终在Microsoft Windows上运行.因此，在使用Windows GDI时我没有问题.

Note: Assume that my silverlight application will always run on Microsoft Windows. So I don't have problem pinvoking Windows GDI.

推荐答案

如果您可以将本机DLL公开为实现IDispatch的COM服务器，则可以从Silverlight(通过AutomationFactory类)访问它. Windows中的浏览器外信任应用程序"中.

If you can expose your native DLL as a COM Server that implements IDispatch, you can access that from Silverlight (via the AutomationFactory class) if you're in an Out of Browser Trusted Application on Windows.

我仍然建议(根据对达林回答的评论)，您应该很好地看待该平台，因为您的"PlayVideo"/"PauseVideo"示例表明您正在尝试做该平台可能已经可以做的事情-以及更好的是，该平台可以在MacOS和浏览器中实现，而不必编写自己的COM Server，等等.

I still recommend (per my comment to Darin's answer) that you take a good look at the platform, as your "PlayVideo"/"PauseVideo" example suggests you're trying to do things the platform can likely already do - and better yet, the platform can do it on MacOS, and in-browser, and without the ugliness of writing your own COM Server, and so on.

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