关于QT中使用pixmap进行图片的切换问题

由于做项目刚刚接触QT，对槽机制不是很了解~求指教~~下面是一小段代码~代码执行后一按下change程序就崩溃

1. PictureChange::PictureChange(QWidget *parent) : QDialog(parent)
   
2. {        
   
3. picName="/home/common/my_program/picture/picture.jpg";     
   
4. QLabel *label=new QLabel;     
   
5. button_change=new QPushButton("change");       connect(button_change,SIGNAL(clicked()),this,SLOT(change_clicked()));   
   
6. pixmap=new QPixmap;   
   
7. pixmap->load(picName);     
   
8. label->setPixmap(*pixmap);      
   
9. 布局~
   
10. }  
    
11. void PictureChange::change_clicked()
    
12. {     
    
13. QString picpath1,picpath2;        
    
14. picpath1="/home/common/my_program/picture/picture.jpg";     picpath2="/home/common/my_program/picture/picture2.jpg";      
    
15. pixmap->load(picpath2);   
    
16. label->setPixmap(*pixmap);//执行此句后出问题，不知应如何实现图片切换
    
17. }

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程序的头文件是这个~

1. #ifndef PICTURECHANGE_H
   
2. #define PICTURECHANGE_H  
   
3. #include <QDialog>  
   
4. class QPushButton;
   
5. class QLabel;  
   
6. class PictureChange:public QDialog {     
   
7. Q_OBJECT
   
8. public:     PictureChange(QWidget *parent=0);
   
9. private slots:     void change_clicked();
   
10. private:     
    
11. QString picName;     
    
12. QLabel *label;     
    
13. QPixmap *pixmap;     
    
14. QPushButton *button_change;     
    
15. QPushButton *button_quit; };
    
16. #endif

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