如何编写一个本地化的屏幕上的键盘 [英] How to write an localized on-screen-keyboard

问题描述

我要屏幕键盘为我们公司的计划，该计划主要是对行业的PC用触摸功能使用上写的。

I have to write an on screen keyboard for our company's program, which is mostly used on industry's PCs with touch capability.

我们不能使用Windows默认键盘，因为我们并不需要在键盘上的键。于是，我被要求写在C＃中自定义的。

We can't use the windows default keyboard because we don't need all keys on the keyboard. So I was asked to write a custom one in C#.

我已经发现的这个博客作为参考，但我不知道如何下手。

I already found this blog as reference, but I'm not sure how to start.

我创建了一个小型原型GUI并指定为每个键扫描码，而这些扫描码转换为相关的字符。并把它们发送到主动控制。但我不知道扫描码我应该使用。

I created a small prototype GUI and assign for each key a scancode, and translate these scancodes to the related character. And send them to the active control. But I'm not sure what scancodes I should use.

所以我的问题是，这是正确的方式来写一个OSK这样，如果它是扫描码我应该使用？任何链接？

So my question is, is that the correct way to write a OSK like this and if yes which scancodes should I use? Any links?

我也不能确定如何处理<大骨节病>移动美国...

I'm also not sure how to handle the shift states...

编辑：

好吧，我做了些研究，并用OSK它读取当前的键盘布局，甚至想出了处理容易<大骨节病>移状态（<大骨节病>移和<大骨节病> Alt键的Gr ）。我写了 KeyButton 类从按钮继承，这 KeyButton 有一个类型字节的扫描码属性，如果你指定一个有效的扫描码吧，在 KeyButton 将调用相关函数来得到正确的文本。我用从迈克尔·卡普兰博客的功能与一些小的修改。 。最终事实证明，我不得不这样做，因为他做了同样的

Okay I did a bit more research and came up with a osk which reads the current keyboard layout and even handles the easy shift states (Shift and Alt Gr). I wrote a KeyButton class which inherits from Button, this KeyButton has a ScanCode property of type byte and if you assign a valid scancode to it, the KeyButton will call the related functions to get the correct text. I used the functions from Michael Kaplan blogs with some small changes. In the end it turned out that I just had to do the same as he did.

所以，回答我的问题是：是的，你必须在使用扫描码的按钮，然后拿到virtualkey和键盘布局中的Unicode。 使用这些扫描码。

So the answer to my question is: Yes, you have to use scancodes on your buttons and then get the virtualkey and the unicode from the keyboard layout. Use these scancodes.

现在我得到的人物留下的唯一一件事就是四处发送这些。

Now I get the characters the only thing left is to send these around.

推荐答案

我写映射键码字符WPF应用程序映射类。
可以这样能有所帮助。

I wrote mapping classes that map key code to character for WPF application. May be this can help.

public class KeyMapper
{
    /// <summary>
    /// Map key code to character.
    /// If key code cannot be mapped returns empty char.
    /// </summary>
    public static char MapKey(Key key, bool shiftPressed, string culture)
    {
        CheckCulture(culture);
        int englishVirtuaCode = KeyInterop.VirtualKeyFromKey(key);
        return EnglishVirtualCodeToChar(englishVirtuaCode, shiftPressed, culture);
    }

    private static void CheckCulture(string culture)
    {
        InputLanguage language = InputLanguage.FromCulture(new CultureInfo(culture));
        if (language == null)
            throw new ArgumentException(string.Format("culture {0} does not exist.", culture));
    }

    private static char EnglishVirtualCodeToChar(int enlishVirtualCode, bool shiftPressed, string culture)
    {
        var scanCode = KeyMappingWinApi.MapVirtualKeyEx((uint)enlishVirtualCode, 0, EnglishCultureHandle);
        var vitualKeyCode = KeyMappingWinApi.MapVirtualKeyEx(scanCode, 1, GetCultureHandle(culture));
        byte[] keyStates = GetKeyStates(vitualKeyCode, shiftPressed);
        const int keyInformationSize = 5;
        var stringBuilder = new StringBuilder(keyInformationSize);
        KeyMappingWinApi.ToUnicodeEx(vitualKeyCode, scanCode, keyStates, stringBuilder, stringBuilder.Capacity, 0, GetCultureHandle(culture));
        if (stringBuilder.Length == 0)
            return ' ';
        return stringBuilder[0];
    }

    private static IntPtr EnglishCultureHandle
    {
        get { return GetCultureHandle("en-US"); }
    }

    private static IntPtr GetCultureHandle(string culture)
    {
        return InputLanguage.FromCulture(new CultureInfo(culture)).Handle;
    }

    /// <summary>
    /// Gets key states for ToUnicodeEx function
    /// </summary>
    private static byte[] GetKeyStates(uint keyCode, bool shiftPressed)
    {
        const byte keyPressFlag = 0x80;
        const byte shifPosition = 16; // position of Shift key in keys array
        var keyStatses = new byte[256];
        keyStatses[keyCode] = keyPressFlag;
        keyStatses[shifPosition] = shiftPressed ? keyPressFlag : (byte)0;
        return keyStatses;
    }
}

public class KeyMappingWinApi
{
    [DllImport("user32.dll")]
    public static extern uint MapVirtualKeyEx(uint uCode, uint uMapType, IntPtr dwhkl);

    [DllImport("user32.dll")]
    public static extern int ToUnicodeEx(uint wVirtKey, uint wScanCode, byte[] lpKeyState,
        [Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pwszBuff, int cchBuff, uint wFlags, IntPtr dwhkl);

    [DllImport("user32.dll")]
    public static extern short VkKeyScanEx(char ch, IntPtr dwhkl);
}

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