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  • Qt QString to char*

    QString转换成char * 的时候,一定要定义一个QBateArray的变量。不能连写

    How can I convert a QString to char* and vice versa ?(trolltech)
    Answer:
    In order to convert a QString to a char*, then you first need to get a latin1 representation of the string by calling toLatin1() on it which will return a QByteArray. Then call data() on the QByteArray to get a pointer to the data stored in the byte array. See the documentation:
    See the following example for a demonstration:


    int main(int argc, char **argv)
    {
     QApplication app(argc, argv);
     QString str1 = "Test";
     QByteArray ba = str1.toLatin1();
     const char *c_str2 = ba.data();
     
     printf("str2: %s", c_str2);
     return app.exec();   
    }
    Note that it is necessary to store the bytearray before you call data() on it, a call like the following
    const char *c_str2 = str2.toLatin1().data();
    will make the application crash as the QByteArray has not been stored and hence no longer exists.
     


    To convert a char* to a QString you can use the QString constructor that takes a QLatin1String, e.g:
    QString string = QString(QLatin1String(c_str2)) ;

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  • 原文地址:https://www.cnblogs.com/wiessharling/p/3180957.html
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