如何將QString轉換為char *或者相反

How can I convert a QString to char* and vice versa ?(trolltech)

Answer:
Inorder to convert a QString to a char*, then you first need to get alatin1 representation of the string by calling toLatin1() on it whichwill return a QByteArray. Then call data() on the QByteArray to get apointer 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)) ;

以上轉自：http://www.cppblog.com/Alina-zl/archive/2008/11/19/67323.html

?

1. 紅色字體標出的存儲那一步非常重要！！！！！！

2. 用toLatin1好像不支持中文，用toLocal8Bit可以支持。

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