In Qt, and in most applications that use Qt, most or all user-visible strings are stored using Unicode. Qt provides: Translation to/from legacy encoding for file I/O: see QTextCodec and QTextStream. Support for locale specific Input Methods and keyboards.

In Qt, a UTF-16 codeunit is represented as a QChar, so you need two QChar values, eg: or: Assuming a platform where sizeof(wchar_t) is 2 and not 4. In your example, you tried using QString::fromUtf8(), but you gave it an invalid UTF-8 string. For U+1F50E, it should have looked like this instead: You can also use QString::fromUcs4() instead:

Returns a QString initialized with the first size characters of the Unicode string unicode (encoded as UTF-32). If size is -1 (default), unicode must be '\0'-terminated. See also toUcs4 (), fromUtf16 (), utf16 (), setUtf16 (), fromWCharArray (), and fromStdU32String ().

for any other encoding schemes you have to build a proper QTextCodec (by using QTextCodec::codecForName () or similar methods), and then use its toUnicode () method. What's QString? QString is a re-entrant, implicitly shared container for an UTF-16 encoded string.

Mar 29, 2023 · 文章介绍了在Qt环境中，如何利用QTextCodec类和fromLocal8Bit/toLocal8Bit方法进行Unicode、GBK和UTF-8编码之间的相互转换，包括QString和QByteArray的处理。

How can I specify a unicode character by code (such as "4FF0") using QString? I tried QString s("\u4FF0"); but it only outputs a question mark. Any idea how to do this?

Qt provides QTextCodecs to convert QString (which internally stores characters in unicode) to QByteArray, allowing me to retrieve char* which represents the string in some non-unicode encoding. But what should I do when I want to get a unicode QByteArray?

Oct 13, 2023 · Qt5中QString内部采用unicode字符集，utf-16编码。 构造函数 QString::QString (const char *str)默认使用fromUtf8 ()，将str所指的执行字符集从utf-8转码成utf-16。 由上面fromUtf8 ()可知，QString需要执行字符集编码为utf-8，然后以utf-8进行解码，再编码为utf-16才能获得正确的字符编码。 显示中文乱码的原因其实就是QString转码方式与执行字符集不一致。 (比如，源字符集为本地字符集GBK编码，QString以utf-8的方式进行解码，会导致获得错误的二进 …

The Unicode Character Database (UCD) is a set of files that define the Unicode character properties and internal mappings. Qt Core uses data obtained from UCD files for working with characters and strings.

In Qt, and in most applications that use Qt, most or all user-visible strings are stored using Unicode. Qt provides: Translation to/from legacy encodings for file I/O: see QTextCodec and QTextStream. Support for locale specific Input Methods and keyboards.