最近在寫一個QT程序。需要把QString 轉換成char * 指針。結果遇到程序崩潰的嚴重錯誤。在大量的幫助調試下，發現是QString轉換成char * 的時候，一定要定義一個QBateArray的變量。不能連寫 。
以下是官方回覆：
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)) ;
本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/remote_roamer/archive/2010/10/27/5968896.aspx