QT学习之类型转换,char*,QString,int,QByteArray之间的转换。

QSting->char *

QString msg;
char *buf ;
msg = datagram.data();
QByteArray da = msg.toLatin1();
buf = da.data();

char *->QString

char *buf;
QString str;
str = QString(QLatin1String(buf));

int ->QString

int a ;
QString s;
s = QString::number(a, 10);

QString->int

QString s;
int a;
a = s.tolnt();

char * ->QByteArray

char *buf;
QBteArray data;
data = QByteArray(buf);

QByteArray->char*

char *buf；
QByteArray data；
buf = data.data();

QString->QByteArray

QByteArray data;
QString s;
data = string.toAscii();

QByteArray->QString

QByteArray data;
QString s;
s = QString（data）;