QString,QByteArray和const char*的相互转换

http://stackoverflow.com/questions/5505221/converting-qstring-to-char

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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.

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int main(int argc, char **argv){ QApplication app(argc, argv);  QString str1 = "Test";  QByteArray ba = str1.toLatin1();  const char *c_str2 = ba.data();  return app.exec();}

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)) ;