Is there a way to convert "\uxxxx" to text by C++?

Question

I need to storage some Unicode character using a format like '\uxxxx'.(e.g.\u6D4B). But I can't convert it back to text. I'm using UTF-16, not UTF-8.The way that works on UTF-8 will decode into a wrong character. I tried many ways but they all falied. So I want to know if there a way to do such convertion using C++. No matter using Windows API or boost library or something else.

This is the function I wrote:

CString Decode(CString mark)
{
    int chrnum;
    sscanf(CStringA(mark).GetBuffer(), "\u%X", &chrnum);
    mark.Format(L"%X", chrnum);
    unsigned int chr = std::stoul(CStringA(mark).GetBuffer(), nullptr, 16);
    wchar_t wchr[2] = { boost::numeric_cast<wchar_t>(chr) ,L'\000' };
    mark = CString(wchr);
    return mark;
}

But it outputs nothing.

My encode function as follows:

CString Encode(TCHAR chr)
{
    int recv = static_cast<int>(chr);
    CString ret;
    ret.Format(L"\\u%5X", recv);
    return ret;
}

Here is an example:

Input: \u6D4B

Output: 测

Does [this](https://stackoverflow.com/questions/28534221/c-convert-asii-escaped-unicode-string-into-utf8-string) answer your question? — Cory Kramer, Nov 05 '20 at 12:21
@CoryKramer Isn't using the algorithm in that link a bit risky on Windows where a `wchar_t` is only 16 bits? — Ted Lyngmo, Nov 05 '20 at 12:27
@Cory Kramer No,it gives me a anther character. My encode is using Unicode but the converter is using utf-8. I have added my encode function to the question. — Object Unknown, Nov 05 '20 at 13:16
`\u...` does not work the way you seem to imagine. Backslash escapes like this are interpreted and evaluated at _compile-time_, not at run-time. — 500 - Internal Server Error, Nov 05 '20 at 14:58
@CoryKramer great reference. the reference inside the accepted reply must do the trick. — Red.Wave, Nov 05 '20 at 16:18
@500-internal-server-error I know. So I'm looking for a run-time way. — Object Unknown, Nov 06 '20 at 02:11
@red-wave This does not output right character.It can't' pass the example test. — Object Unknown, Nov 06 '20 at 03:26

Is there a way to convert "\uxxxx" to text by C++?

0 Answers0