如何将 QString 转换为 std::string?

问题描述

我正在尝试做这样的事情:

I am trying to do something like this:

QString string;
// do things...
std::cout << string << std::endl;

但代码无法编译.如何将 qstring 的内容输出到控制台(例如出于调试目的或其他原因)?如何将QString 转换为std::string?

but the code doesn't compile. How to output the content of qstring into the console (e.g. for debugging purposes or other reasons)? How to convert QString to std::string?

推荐答案

将 QString 转换为 std::string 时应该记住的一件事是QString 是 UTF-16 编码，而 std::string... 可以有任何编码.

One of the things you should remember when converting QString to std::string is the fact that QString is UTF-16 encoded while std::string... May have any encodings.

所以最好的是:

QString qs;

// Either this if you use UTF-8 anywhere
std::string utf8_text = qs.toUtf8().constData();

// or this if you're on Windows :-)
std::string current_locale_text = qs.toLocal8Bit().constData();

如果您指定编解码器，建议(接受)的方法可能会起作用.

The suggested (accepted) method may work if you specify codec.

参见:http://doc.qt.io/qt-5/qstring.html#toLatin1

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