将虚拟键代码转换为Unicode字符串 [英] Convert Virtual Key Code to unicode string

问题描述

我有一些代码，我一直在使用获得当前的键盘布局，并将虚拟键代码转换为字符串。这在大多数情况下工作伟大，但我有一些特定的情况下的麻烦。使它亮起来的是德国QWERTZ键盘上backspace键旁边的重音键。 http://en.wikipedia.org/wiki/File:KB_Germany.svg

I have some code I've been using to get the current keyboard layout and convert a virtual key code into a string. This works great in most situations, but I'm having trouble with some specific cases. The one that brought this to light is the accent key next to the backspace key on german QWERTZ keyboards. http://en.wikipedia.org/wiki/File:KB_Germany.svg

该键生成VK代码，我期望 kVK_ANSI_Equal 但是当使用QWERTZ键盘布局时，我没有回描述。它结束了一个死的钥匙，因为它应该用另一个钥匙组成。有没有办法抓住这些情况并进行正确的转换？

That key generates the VK code I'd expect kVK_ANSI_Equal but when using a QWERTZ keyboard layout I get no description back. Its ending up as a dead key because its supposed to be composed with another key. Is there any way to catch these cases and do the proper conversion?

我当前的代码如下。

TISInputSourceRef currentKeyboard = TISCopyCurrentKeyboardInputSource();
CFDataRef uchr = (CFDataRef)TISGetInputSourceProperty(currentKeyboard, kTISPropertyUnicodeKeyLayoutData);
const UCKeyboardLayout *keyboardLayout = (const UCKeyboardLayout*)CFDataGetBytePtr(uchr);

if(keyboardLayout)
{
    UInt32 deadKeyState = 0;
    UniCharCount maxStringLength = 255;
    UniCharCount actualStringLength = 0;
    UniChar unicodeString[maxStringLength];

    OSStatus status = UCKeyTranslate(keyboardLayout,
                                     keyCode, kUCKeyActionDown, 0,
                                     LMGetKbdType(), kUCKeyTranslateNoDeadKeysBit,
                                     &deadKeyState,
                                     maxStringLength,
                                     &actualStringLength, unicodeString);

    if(actualStringLength > 0 && status == noErr)
        return [[NSString stringWithCharacters:unicodeString length:(NSInteger)actualStringLength] uppercaseString];
}

推荐答案

一个死的键，你可以看到你自己试试，或看看键盘查看器与德国布局活跃。

That key is a dead key, as you can see if you try it yourself or look at the Keyboard Viewer with the German layout active.

在Mac上，要输入一个死键的实际字符，而不是与另一个字符组合，就是在它后面按一个空格。所以尝试：关闭 kUCKeyTranslateNoDeadKeysBit ，如果 UCKeyTranslate 设置死键状态，在它之后翻译一个空格。

On the Mac, the way to enter a dead key's actual character, without composing it with another character, is to press a space after it. So try that: Turn off kUCKeyTranslateNoDeadKeysBit, and if UCKeyTranslate sets the dead-key state, translate a space after it.

EDIT （由asker添加）

EDIT (added by asker)

具有正确解决方案的固定代码。

Just for future people, here is the fixed code with the right solution.

TISInputSourceRef currentKeyboard = TISCopyCurrentKeyboardInputSource();
CFDataRef uchr = (CFDataRef)TISGetInputSourceProperty(currentKeyboard, kTISPropertyUnicodeKeyLayoutData);
const UCKeyboardLayout *keyboardLayout = (const UCKeyboardLayout*)CFDataGetBytePtr(uchr);

if(keyboardLayout)
{
    UInt32 deadKeyState = 0;
    UniCharCount maxStringLength = 255;
    UniCharCount actualStringLength = 0;
    UniChar unicodeString[maxStringLength];

    OSStatus status = UCKeyTranslate(keyboardLayout,
                                     keyCode, kUCKeyActionDown, 0,
                                     LMGetKbdType(), 0,
                                     &deadKeyState,
                                     maxStringLength,
                                     &actualStringLength, unicodeString);

    if (actualStringLength == 0 && deadKeyState)
    {
        status = UCKeyTranslate(keyboardLayout,
                                         kVK_Space, kUCKeyActionDown, 0,
                                         LMGetKbdType(), 0,
                                         &deadKeyState,
                                         maxStringLength,
                                         &actualStringLength, unicodeString);   
    }
    if(actualStringLength > 0 && status == noErr)
        return [[NSString stringWithCharacters:unicodeString length:(NSUInteger)actualStringLength] uppercaseString];
}

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