QString to char* (QT3)

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 *str2 = ba.data();
 printf("str2: %s", str2);
 return app.exec();  
}

 

QString str1 = "Test";
QByteArray ba = str1.toLatin1();
const char *str2 = ba.data();

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();//wrong

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));

 

 

我觉得应该是这个样子吧：

char *str2 = "Test";

QString str1(QLatin1String(str2));