code

stay main Function QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));

QString turn char*

One ：

QByteArray byte_data = str.toUtf8();
char *ch = byte_data.data();

Two ：

QByteArray byte_data = str.toLocal8Bit();
char *ch = byte_data.data();

3、 ... and ：

std::string str1 = str.toStdString();
const char* ch = str1.c_str();

Four ：
Use wide characters explicitly （wchar_t） or UTF-8 That's a good way .

QString str0(QString::fromStdWString(L" Mathematical analysis "));
QString str1(QString::fromUtf8(u8" Advanced algebra ")); // C++11

5、 ... and ：

QString s1 = " chinese ";
QString s2(" Chinese ");
QString s3 = tr(" chinese ")
QString s4 = QStringLiteral(" chinese ");
QString s5 = QString::fromWCharArray(L" chinese ");
QString s6 = u8" chinese ";//C++11
QString s7 = tr(u8" chinese ")

6、 ... and ：
increase VS Compile parameters ： Specify the source character set and the executable character set as UTF-8

7、 ... and ：

#pragma execution_character_set("utf-8")

8、 ... and ：
pro Add... To the document

win32:msvc{
    
    QMAKE_CXXFLAGS += /source-charset:utf-8 /execution-charset:utf-8
}

https://www.cnblogs.com/liunian1004/p/5912536.html