使用 C# 在通用 windows 应用程序中未检测到键盘布局更改

Question

我想用 C# 检测每一个键盘布局变化。无论是通过 win + space 还是 alt + shift 或鼠标切换都没关系... 我编写的代码对于桌面应用程序非常有效（见下文）。但它不适用于 UWP 应用程序。如果我在 UWP 应用程序中切换布局，则不会检测到它，如果我切换到桌面应用程序，则会立即检测到更改......我怎样才能检测到布局中的任何更改？有没有其他方法可以找出在任何给定时刻处于活动状态的布局，而不管 window 处于活动状态？我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Win32;
using System.Runtime.InteropServices;
using System.Globalization;

namespace ConsoleApplication1
{
class Program
{
    static void Main(string[] args)
    {
        string lastLang = "";
        while (true)
        {
            string langSuffix = GetKeyboardLayoutIdAtTime();

            if (!langSuffix.Equals(lastLang))
            {
                // do something
                Console.WriteLine(getCurrentTimeStamp() + ": Changing '" + lastLang + "' to '" + langSuffix + "'.");
                lastLang = langSuffix;
            }
            System.Threading.Thread.Sleep(1000);

        }

    }


    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    private static extern IntPtr GetForegroundWindow();

    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    private static extern int GetWindowThreadProcessId(IntPtr handleWindow, out int lpdwProcessID);

    [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    private static extern IntPtr GetKeyboardLayout(int WindowsThreadProcessID);

    public static string GetKeyboardLayoutIdAtTime()
    {
        IntPtr hWnd = GetForegroundWindow();
        int lpdwProcessId;
        InputLanguageCollection installedInputLanguages = InputLanguage.InstalledInputLanguages;
        CultureInfo currentInputLanguage = null;
        int WinThreadProcId = GetWindowThreadProcessId(hWnd, out lpdwProcessId);

        IntPtr KeybLayout = GetKeyboardLayout(WinThreadProcId);
        // this remain unchanged when I switch layouts in UWP
        Console.WriteLine("KL IntPtr: " + KeybLayout);

        for (int i = 0; i < installedInputLanguages.Count; i++)
        {
            if (KeybLayout == installedInputLanguages[i].Handle) currentInputLanguage = installedInputLanguages[i].Culture;

        }
        if(currentInputLanguage == null)
        {
            Console.WriteLine(getCurrentTimeStamp() + "current input language is null...");
        }
        return currentInputLanguage.TwoLetterISOLanguageName;
    }

    private static string getCurrentTimeStamp()
    {
        return DateTime.Now.ToString("yyyyMMddHHmmssffff");
    }
}

}

Answer 1

在桌面中，我们使用 Input Method Manager to communicate with an input method editor (IME), which runs as a service. In UWP, we should be able to use the Text Services Framework. There is a document about Alternatives to Windows APIs in Universal Windows Platform (UWP) apps。

所以我们应该可以使用Windows.UI.Text.Core名称space，它提供了访问Windows核心文本API和文本输入服务器的类型。 Windows 核心文本是一个客户端-服务器系统，它将键盘输入的处理集中到单个服务器中。

我们可以找到InputLanguageChanged event in the CoreTextServicesManagerclass。当当前输入语言发生变化时发生。当我们通过 win + space 或 alt + shift 或鼠标切换输入法时， InputLanguageChanged 将被触发。

例如：

public MainPage()
{
    this.InitializeComponent();
    CoreTextServicesManager textServiceManager = CoreTextServicesManager.GetForCurrentView();
    textServiceManager.InputLanguageChanged += TextServiceManager_InputLanguageChanged;
}

private void TextServiceManager_InputLanguageChanged(CoreTextServicesManager sender, object args)
{
    Debug.WriteLine("Keyboard layout is changed!");
}

使用 C# 在通用 windows 应用程序中未检测到键盘布局更改

Keyboard layout change not detected in universal windows apps with C#

c#

windows

uwp

keyboard-layout