Qt图标的显示问题

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QAction>
class MAinWindow:public QMainWindow
{
    Q_OBJECT
public:
    MAinWindow(QWidget *parent=0);
    ~MAinWindow();
private:
    void open();
    QAction *openAction;
};
#endif

#include "mainwindow.h"

#include <QMenuBar>

#include <QMessageBox>

#include <QStatusBar>

#include <QToolbar>

#include <QDialog>

MAinWindow::MAinWindow(QWidget *parent):QMainWindow(parent)

    setWindowTitle(tr("Main Window"));

    openAction=new QAction(QIcon(":/images/doc-open"),tr("&Open..."),this);//我添加的图标显示不出来

    openAction->setShortcuts(QKeySequence::Open);

    openAction->setStatusTip(tr("Open a file"));

    connect(openAction,&QAction::triggered,this,&MAinWindow::open);

    QMenu *file=menuBar()->addMenu(tr("&File"));

    file->addAction(openAction);

    QToolBar *toolBar=addToolBar(tr("&File"));

    toolBar->addAction(openAction);

    QStatusBar *statusbar=statusBar();

    statusbar->addAction(openAction);

MAinWindow::~MAinWindow()

void MAinWindow::open()

    //QDialog dialog;

    //dialog.setWindowTitle(tr("hello,dialog"));

    //dialog.exec();

    QMessageBox::information(this,tr("Information"),tr("open"));

}

#include<QApplication>

#include "mainwindow.h"

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

    QApplication app(argc,argv);

    MAinWindow win;

    win.show();

    return app.exec();

我有个问题就是为什么我添加的图标显示不出来！求大神看一下！

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