在 Windows 8 桌面程序中检测键盘是否存在

问题描述

对于 Metro 应用程序，有 Windows.Devices.Input.KeyboardCapabilities.KeyboardPresent.有没有办法让 Windows 8 桌面程序检测物理键盘是否存在?

For Metro apps there's Windows.Devices.Input.KeyboardCapabilities.KeyboardPresent.Is there a way for Windows 8 desktop programs to detect whether a physical keyboard is present?

推荐答案

在 Windows 10 上，此 API 是 UWP API 的一部分，可以从桌面应用程序调用就好了.

On Windows 10 this API is part of the UWP API and can be called from Desktop applications just fine.

要从 C#(或其他 .NET 语言)调用它，您需要添加一些对项目文件的引用:

To call it from C# (or other .NET languages) you need to add a few references to the project files:

<Reference Include="System.Runtime.WindowsRuntime" />
<Reference Include="Windows.Foundation.FoundationContract">
  <HintPath>C:Program Files (x86)Windows Kits10References10.0.16299.0Windows.Foundation.FoundationContract3.0.0.0Windows.Foundation.FoundationContract.winmd</HintPath>
  <Private>False</Private>
</Reference>
<Reference Include="Windows.Foundation.UniversalApiContract">
  <HintPath>C:Program Files (x86)Windows Kits10References10.0.16299.0Windows.Foundation.UniversalApiContract5.0.0.0Windows.Foundation.UniversalApiContract.winmd</HintPath>
  <Private>False</Private>
</Reference>

第一个引用将针对 GAC 进行解析，另外两个在您的 VS 安装中(您可以根据需要选择不同的版本).将 Private 设置为 False 意味着不部署这些程序集的本地副本.

The first reference will be resolved against the GAC, the other two are in your VS installation (you can chose a different version if you want). Setting Private to False means to not deploy a Local Copy of those assemblies.

Console.WriteLine(new Windows.Devices.Input.KeyboardCapabilities().KeyboardPresent != 0 ? "keyboard available" : "no keyboard");

在 C++ 中你可以这样做:

In C++ you can do it as follows:

#include <roapi.h>
#include <wrl.h>
#include <windows.devices.input.h>

#pragma comment(lib, "runtimeobject")

int APIENTRY wWinMain(
    _In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPWSTR lpCmdLine,
    _In_ int nCmdShow)
{
    RoInitialize(RO_INIT_MULTITHREADED);
    {
        INT32 isKeyboardAvailable;
        Microsoft::WRL::ComPtr<ABI::Windows::Devices::Input::IKeyboardCapabilities> pKeyboardCapabilities;
        Microsoft::WRL::Wrappers::HStringReference KeyboardClass(RuntimeClass_Windows_Devices_Input_KeyboardCapabilities);
        if (SUCCEEDED(RoActivateInstance(KeyboardClass.Get(), &pKeyboardCapabilities)) &&
            SUCCEEDED(pKeyboardCapabilities->get_KeyboardPresent(&isKeyboardAvailable)))
        {
            OutputDebugStringW(isKeyboardAvailable ? L"keyboard available
" : L"no keyboard
");
        }
    }
    RoUninitialize();
}

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