如何在按键时识别Unicode键？ [英] How to identify unicode keys on key press?

问题描述

我的应用程序使用Unicode字符，我有几个文本字段，我想限制用户输入诸如：';

My application uses unicode characters and i have several text fields where i want to restrict user from inputing special characters like :'";

begin
    if not (Key in ['a'..'z','A'..'Z',' ','0'..'9',#13,#8]) then
        Key := #0;
    if Key = #13 then
        bOk.Click;
end;

因此，在这一点上，它允许用户添加空格并使用退格键进行擦除，当然还可以使用Enter键进行确认。

So at this point it lets user add spaces and use a backspace key to erase, and of course Enter key to comfirm.

我也想输入很少的Unicode字符
±，č，ė，į，š，ų，ū，ž
及其它们大写字母替代项，但只需将它们像这样添加到集合中即可。

There are few unicode characters i want to let being inputed also. ą, č, ė, į, š, ų, ū, ž and their uppercase alternatives, but just adding them to the set like so...

Key in ['a'..'z','A'..'Z',' ','0'..'9',#13,#8,'ą'..'ž','Ą'..'Ž']

...什么也不做，我仍然无法在文本字段中写这些符号。

... does nothing and i still can not write these symbols in the text field.

我想知道如何解决此问题，有没有办法判断是否按下了键

I would like to know, how to fix this problem. Is there a way to tell if the pressed key is the unicode character i'm looking for?

谢谢

推荐答案

如果您使用的是D2009或更高版本，则有一个名为 Character 的单元，其中包含诸如 IsLetterOrDigit ， IsLetter 等功能，这些都专门处理您的工作需要。

If you're on D2009 or later there's a unit named Character containing functions like IsLetterOrDigit, IsLetter, etc. all handling specifically what you need.

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