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I use qtcreator 2.6.1 in xp sp3(Lib:qt-win-opensource-4.8.4-mingw.exe).I find Chinese can not be displayed,but in 2.4.1 is ok

here is the code:
//————————————main.cpp————————————
#include “mainwindow.h”
#include
#include

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QTextCodec::setCodecForTr(QTextCodec::codecForLocale());//设置编码
MainWindow w;
w.show();

return a.exec();
}
//—————————————mainwindow.cpp——————————————-
#include “mainwindow.h”
#include “ui_mainwindow.h”

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->pushButton->setText(tr(“新窗口”));//将界面上按钮显示的文本更改为“新窗口”
}

MainWindow::~MainWindow()
{
delete ui;
}

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