C++ Conversion UTF-8 to String

Question

I have a web server developed in C++. In this web server, the data is received from the client side and stored in the database. Some of this data is in Persian, which is converted to Unicode UTF-8 format.
as example:

data string is "سلام" in client side
when i get data, in webserver
"D8%B3%D9%84%D8%A7%D9%85"

I want to convert UTF-8 Code to c++ string, How can I do this conversion?

Does this answer your question? How do I properly use std::string on UTF-8 in C++? — Tom
– Tom, Commented Jun 17, 2020 at 7:53
As already described in the answer it's not UTF-8 encoded but URL encoded. You've forgotten the first %. It's "%D8%B3%D9%84%D8%A7%D9%85". That's how you would do it in JavaScript: wandbox.org/permlink/4WRinFLfKHNoEfoe. You need a way encode and decode in C++. libcurl is a library that can do this in C (and C++) with curl_easy_escape and curl_easy_unescape — Thomas Sablik
– Thomas Sablik, Commented Jun 17, 2020 at 8:58

Sebastian Hoffmann · Accepted Answer · 2020-06-17 07:54:18Z

3

Your string is not UTF-8 encoded but uses a custom encoding similiar to HTTP url query params.

% indicates that the next two characters encode a single byte in hex. You will need to parse for % and if you encounter such a character, interpret the next two characters as a hexadecimal encoded byte. Otherwise you just copy the characters/bytes over.

answered Jun 17, 2020 at 7:54

Sebastian Hoffmann

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