Qt展示一个控件一秒后消失

Qt显示一个控件一秒后消失.
大家好,我想实现这样的一个效果: 一个小方块,等点击某个操作后,在屏幕的右下角显示一个反馈信息,等一秒后消失.有点
类似android手机里的退出提示控件ctoast,

我的代码思路是这样的: 继承一个QWidget,再里面放一个定时器,等时间到后,关闭当前这个Widget,这样做放到别的类中
构造函数还可以,可是放到普通函数中,就出现段错误,请问下这个是什么情况.

我的代码如下

C/C++ code

#ifndef WIDGET_H#define WIDGET_H#include <QWidget>#include <QWidget>#include <QtGui/QWidget>#include <QTimer>#include <QGroupBox>#include <QLabel>class CToast : public QWidget{    Q_OBJECTpublic:    explicit CToast(const int timeMs=10000,const QString string="set success!",QWidget *parent = 0);    ~CToast();private slots:    void closewidget();private:    QLabel *label;    QGroupBox *grpWidget;    QTimer *timer;};#include <QTimer>class Widget : public QWidget{    Q_OBJECT    public:    Widget(QWidget *parent = 0);    ~Widget();private slots:    void timerouttest();private:    QTimer *m_timer;};#endif // WIDGET_H

C/C++ code

#include "widget.h"#include <QHBoxLayout>#include <QLabel>#include <QDesktopWidget>#include <QApplication>#include <QMessageBox>#include <QTimer>#include <QGridLayout>#include <QGraphicsColorizeEffect>CToast::CToast(const int timeMs, const QString string, QWidget *parent)      : QWidget(parent){    setWindowFlags(Qt::FramelessWindowHint);  //设置无windows标题    setFixedSize(80,40);    move(200,150);       timer=new QTimer;    connect(timer,SIGNAL(timeout()),this,SLOT(closewidget()));    timer->start(timeMs);    setStyleSheet("background-color: black;border-radius:15px");    label=new QLabel((string));    label->setStyleSheet("color:white");     QGridLayout *rowWin=new QGridLayout;     rowWin->setContentsMargins(5,5,5,5);     rowWin->addWidget(label,0,0);     setLayout(rowWin); } CToast::~CToast() {     delete label;     delete grpWidget;     delete timer;     timer=NULL; } void CToast::closewidget() {    timer->stop();    close();   delete this; }Widget::Widget(QWidget *parent)    : QWidget(parent){    m_timer=new QTimer();     connect(m_timer,SIGNAL(timeout()),this,SLOT(timerouttest()));     m_timer->start(1000);}Widget::~Widget(){    }void Widget::timerouttest(){  CToast *to1=new CToast(1000*1,"lajdsajs");}