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ADS 功能增加了以下公共 API 功能#xff1a;
枚举系统中的多路复用器设备。查询有关多路复用器的信息#xff0c;例如#xff0c;它连接了哪些目标#xff0c;以及当前切换到哪个目标。触发多路复用器切换。如何检测多路复用器是否已切换。
枚举系统中的多路复…API 更改
ADS 功能增加了以下公共 API 功能
枚举系统中的多路复用器设备。查询有关多路复用器的信息例如它连接了哪些目标以及当前切换到哪个目标。触发多路复用器切换。如何检测多路复用器是否已切换。
枚举系统中的多路复用器设备
应用程序可以使用通用的即插即用 API 来查找代表正常显示多路复用器的设备接口。 用户模式组件可使用Windows.Devices.Enumeration.DeviceInformation。 无论是 C# 还是 C都可以使用这些 API 来枚举多路复用器设备。
// Display Mux device interface
// {93c33929-3180-46d3-8aab-008c84ad1e6e}
DEFINE_GUID(GUID_DEVINTERFACE_DISPLAYMUX, 0x93c33929, 0x3180, 0x46d3, 0x8a, 0xab, 0x00, 0x8c, 0x84, 0xad, 0x1e, 0x6e);
IDisplayMuxDevice 接口
添加 IDisplayMuxDevice 接口来表示多路复用器设备。
以下代码演示了如何使用 Windows Runtime API 枚举显示多路复用器设备、查询其状态、切换活动显示目标以及对状态变化做出反应。
#include winrt/Windows.Foundation.h
#include winrt/Windows.Devices.Enumeration.h
#include winrt/Windows.Foundation.Collections.h
#include winrt/Windows.Devices.Display.Core.h#include string
#include sstream
#include iomanip
#include windows.hnamespace winrt
{
using namespace winrt::Windows::Foundation;
using namespace winrt::Windows::Foundation::Collections;
using namespace winrt::Windows::Devices::Enumeration;
using namespace winrt::Windows::Devices::Display;
using namespace winrt::Windows::Devices::Display::Core;
} // namespace winrtvoid SwitchDisplayMuxTarget()
{// PnP device interface search string for Mux device interfacestd::wstring muxDeviceSelector LSystem.Devices.InterfaceClassGuid:\{93c33929-3180-46d3-8aab-008c84ad1e6e}\ AND System.Devices.InterfaceEnabled:System.StructuredQueryType.Boolean#True;// Execute the device interface querywinrt::DeviceInformationCollection deviceInformations winrt::DeviceInformation::FindAllAsync(muxDeviceSelector, nullptr).get();if (deviceInformations.Size() 0){printf(No DisplayMux devices\n);return;}printf(%ld display mux devices found\n\n, deviceInformations.Size());// Only one mux in first release but here is generic code for multiplefor (unsigned int i 0; i deviceInformations.Size(); i){printf(Display Mux device %ld :\n, i);// Get the device interface so we can query the infowinrt::DeviceInformation deviceInfo deviceInformations.GetAt(i);// Get the device idstd::wstring deviceId deviceInfo.Id().c_str();printf( Device ID string : %S \n, deviceId.c_str());// Create the DisplayMuxDevice objectauto displayMuxDevice winrt::DisplayMuxDevice::FromIdAsync(deviceId).get();if (!displayMuxDevice){printf(Failed to create DisplayMuxDevice object);continue;}// Check if DisplayMux is activeauto displayMuxActive displayMuxDevice.IsActive();printf( DisplayMux state : %s \n, displayMuxActive ? Active : Inactive);if (!displayMuxActive){continue;}// Register for call back when the state of the DisplayMux changesUINT changeCount 0;auto token displayMuxDevice.Changed([changeCount](auto, auto Args) - HRESULT {changeCount;return S_OK;});// Find targets connected to the DisplayMux and the current targetauto targetsList displayMuxDevice.GetAvailableMuxTargets();winrt::DisplayTarget currentTarget displayMuxDevice.CurrentTarget();// Switch the display mux to the other target// NOTE SetPreferredTarget() is a sync method so use .get() to wait for the operation to completeprintf(\n);if (currentTarget targetsList.GetAt(0)){printf(DisplayMux currently connected to first target\n);displayMuxDevice.SetPreferredTarget(targetsList.GetAt(1)).get();printf(Calling SetPreferredTarget to switch DisplayMux to second target\n);}else if (currentTarget targetsList.GetAt(1)){printf(DisplayMux currently connected to second target\n);displayMuxDevice.SetPreferredTarget(targetsList.GetAt(0)).get();printf(Calling SetPreferredTarget to switch DisplayMux to first target\n);}else{printf(Could not find current target in target list\n);}// Now read the current positioncurrentTarget displayMuxDevice.CurrentTarget();targetsList displayMuxDevice.GetAvailableMuxTargets();if (currentTarget targetsList.GetAt(0)){printf(DisplayMux is now currently connected to first target\n);}else if (currentTarget targetsList.GetAt(1)){printf(DisplayMux is now currently connected to second target\n);}else{printf(Could not find current target in target list\n);}// Now unregister for change callback and display thedisplayMuxDevice.Changed(token);printf(DisplayMux state change callback was called %ld times\n\n, changeCount);}
}
