blocks|key|1179450|text|如果使用与STL兼容的方式进行编译，则QString具有将std::string转换为QString的static+method|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1179451|std::string+str+=+"abc";
QString+qstr+=+QString::fromStdString(str);|code-block|syntax|javascript|1179452|entityMap|0|LINK|mutability|MUTABLE|url|http://doc.qt.io/qt-5/qstring.html#fromStdString^0|J|7|T|B|17|7|1F|D|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

If compiled with STL compatibility, <code>QString</code> has a <a href="http://doc.qt.io/qt-5/qstring.html#fromStdString" rel="noreferrer">static method</a> to convert a <code>std::string</code> to a <code>QString</code>:

<pre><code>std::string str = "abc";
QString qstr = QString::fromStdString(str);
</code></pre>

blocks|key|1394992|text|另一种方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1394993|std::string+s+=+"This+is+an+STL+string";
QString+qs+=+QString::fromAscii(s.data(),+s.size());|code-block|syntax|javascript|1394994|这样做的好处是不使用.c_str()，这可能会导致std::string复制自身，以防最后没有地方添加'\0'。|offset|length|style|CODE|1394995|entityMap^0|0|0|A|8|P|B|1F|4|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|N|$]]

Alternative way:

<pre><code>std::string s = "This is an STL string";
QString qs = QString::fromAscii(s.data(), s.size());
</code></pre>

This has the advantage of not using <code>.c_str()</code> which might cause the <code>std::string</code> to copy itself in case there is no place to add the <code>'\0'</code> at the end.

blocks|key|1179658|text|我遇到这个问题是因为我在遵循答案时遇到了问题，所以我在这里发布了我的解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1179659|上面的示例都显示了包含仅包含ASCII值的字符串的示例，在这种情况下，一切工作正常。但是，在处理Windows中的字符串时，这些解决方案不起作用|1179660|在这种情况下，唯一能给出正确结果的代码是|1179661|std::string+s+=+"Übernahme";
QString+q+=+QString::fromLocal8Bit(s.c_str());|code-block|syntax|javascript|1179662|如果你不需要处理这样的字符串，那么上面的答案将会工作得很好。|1179663|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I came across this question because I had a problem when following the answers, so I post my solution here.

The above examples all show samples with strings containing only ASCII values, in which case everything works fine. However, when dealing with strings in Windows whcih can also contain other characters, like german umlauts, then these solutions don't work

The only code that gives correct results in such cases is

<pre><code>std::string s = "Übernahme";
QString q = QString::fromLocal8Bit(s.c_str());
</code></pre>

If you don't have to deal with such strings, then the above answers will work fine.

blocks|key|1395196|text|此外，要转换您想要的任何内容，可以使用QVariant类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1395197|例如：|1395198|std::string+str("hello+!");
qDebug()+<<+QVariant(str.c_str()).toString();
int+test+=+10;
double+titi+=+5.42;
qDebug()+<<+QVariant(test).toString();
qDebug()+<<+QVariant(titi).toString();
qDebug()+<<+QVariant(titi).toInt();|code-block|syntax|javascript|1395199|输出|1395200|"hello+!"
"10"
"5.42"
5|1395201|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Moreover, to convert whatever you want, you can use the QVariant class.

for example: 

<pre><code>std::string str("hello !");
qDebug() &lt;&lt; QVariant(str.c_str()).toString();
int test = 10;
double titi = 5.42;
qDebug() &lt;&lt; QVariant(test).toString();
qDebug() &lt;&lt; QVariant(titi).toString();
qDebug() &lt;&lt; QVariant(titi).toInt();
</code></pre>

output

<pre><code>"hello !"
"10"
"5.42"
5
</code></pre>

What is the most basic way to do it?

问如何将字符串转换为QString？
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