原帖地址:https://zhidao.baidu.com/question/714365828909165245.html
控制台程序
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QString qstr = "convert";
QByteArray ba = qstr.toLatin1();
const char *cstr = ba.data();
printf("cstr: %s", cstr); //输出显示
return app.exec();
}