获取其他窗口的SystemMediaTransportControls [英] Get SystemMediaTransportControls for other window

问题描述

我对 ISystemMediaTransportControlsInterop感兴趣: :GetForWindow 方法.该文档已经过时了.但是我在文件夹 C:\ Program Files(x86)\ Windows Kits \ 10 \ Include \ 10.0.19041.0中找到了 SystemMediaTransportControlsInterop.h 和 SystemMediaTransportControlsInterop.idl 文件Windows SDK的\ um .他们正在描述GetForWindow方法.那么，如何获取ISystemMediaTransportControlsInterop的实例并调用此方法?

I'm interesting in ISystemMediaTransportControlsInterop::GetForWindow method. The documentation is outdated for it. But I have found files SystemMediaTransportControlsInterop.h and SystemMediaTransportControlsInterop.idl in folder C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\um of Windows SDK. They are describing GetForWindow method. So, how can I get an instance of ISystemMediaTransportControlsInterop and call this method?

WinRT仅包含方法 SystemMediaTransportControls.GetForCurrentView ，但是我想从我的应用程序中为其他程序获取SystemMediaTransportControls的实例.

WinRT contains only method SystemMediaTransportControls.GetForCurrentView, but I want to get an instance of SystemMediaTransportControls for other program from my application.

谢谢

推荐答案

因此，我发现 WinRT 是基于 COM 技术的.而且我们可以从互操作接口获得ActivationFactory来调用方法. 例如，在C#上:

So, I have found, that WinRT is based on COM technology. And we can get ActivationFactory to call method from interop interface. For example, on C#:

[Guid("ddb0472d-c911-4a1f-86d9-dc3d71a95f5a")]
[InterfaceType(ComInterfaceType.InterfaceIsIInspectable)]
public interface ISystemMediaTransportControlsInterop
{
    SystemMediaTransportControls GetForWindow(IntPtr Window, [In] ref Guid riid);
}

var smtcInterop = (ISystemMediaTransportControlsInterop)WindowsRuntimeMarshal.GetActivationFactory(typeof(SystemMediaTransportControls));
var guid = typeof(SystemMediaTransportControls).GUID;
var smtc = smtcInterop.GetForWindow(hwnd, ref guid);

但是问题是，如果我尝试其他窗口的 SMTC 实例，则会收到拒绝访问的异常.

But the problem is, that I receive access denied exception if I try SMTC instance of other window.

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