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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)) ;函数
注意在调用QByteArray.data()以前，必需要先显示储存这个bytearray。像这样const char *c_str2 = str2.toLatin1().data();
会使程序崩溃，由于QByteArray没有被储存，调用data()前是不存在的，必须先显式调用一次toLatin1()，再调用data()。spa
要将char*转换成QString，用接收QLatin1String做参数的QString构造函数就能够了：
QString string = QString(QLatin1String(c_str2)) ;get