将 std: : string 转换为 QString

我有一个 std::string content包含 UTF-8数据。我想把它转换成 QString。如何做到这一点，避免 Qt 中的 from-ASCII 转换？

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最佳答案

There's a QString function called fromUtf8 that takes a const char*:

QString str = QString::fromUtf8(content.c_str());

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QString::fromStdString(content) is better since it is more robust. Also note, that if std::string is encoded in UTF-8, then it should give exactly the same result as QString::fromUtf8(content.data(), int(content.size())).

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Usually, the best way of doing the conversion is using the method fromUtf8, but the problem is when you have strings locale-dependent.

In these cases, it's preferable to use fromLocal8Bit. Example:

std::string str = "ëxample";
QString qs = QString::fromLocal8Bit(str.c_str());

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Since Qt5 fromStdString internally uses fromUtf8, so you can use both:

inline QString QString::fromStdString(const std::string& s)
{
return fromUtf8(s.data(), int(s.size()));
}