char*、QbyteArray、QString三种数据类型的转化:
(1)QString->QByteArray
QString buf ="123"; QByteArray a=buf.toUtf8();//中文 a2=buf.toLocal8Bit();//本地编码
(2)QByteArray->QString
QString buf2=QString::fromLocal8Bit(a2);
(3)QByteArray->char*
char* b=a.data();
(4)char*->QString
char *p="abc"; QString c=QString(p);