Qt中文乱码，设置字符集

#include <QtGui/QApplication>
#include "mainwindow.h"
#include <QTextCodec>

int main(int argc, char *argv[])
{

    QApplication a(argc, argv);
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
    MainWindow w;
    w.setWindowFlags(w.windowFlags()&~Qt::WindowMaximizeButtonHint& ~Qt::WindowMinimizeButtonHint);
    w.show();
    //w.showMaximized();

    return a.exec();
}