qt的程序异常退出怎么办？

Qt程序异常终止的原因：\x0d\x0a\x0d\x0a一、在使用指针之前，要进行指针是否为null的判断，如果为NULL却直接使用该指针，就会异常终止。如在QTableView：\x0d\x0aQStandardItemModel*model=newQStandardItemModel\x0d\x0amodel->item(0,1)->text()\x0d\x0a单元格没编辑过，直接用model->item(0,1)->text()的话，程序会异常终止。\x0d\x0a\x0d\x0a二、析构函数中加入释放内存的delete代码后，关闭Qt应用程序，会出现程序异常终止或猜，去掉析构函数里delete的代码就没有问题了。我是在工程中额外添加一个继承自QTableView的Qt设计师界面类，并在ui_widget.h中，即widget.ui界面的源码中，将QTableView改为我这个添加的类的类名。在新建的类的cpp文件中，注释掉\x0d\x0a,ui(newUi::CTblView)\x0d\x0aui->setupUi(this)\x0d\x0a\x0d\x0a两行，但没有注释掉\x0d\x0adeleteui\x0d\x0a\x0d\x0a原因和第一点一样，ui定义了没有使用，就直接delete，谈橡故而导衫侍型致程序异常终止。也注释掉这行就正常了。\x0d\x0a\x0d\x0a三、指针对象没有实例化就进行引用\x0d\x0a如：\x0d\x0aDialog*dd=newDialogd->show()如果忘了第二行的实例化，也会导致Qt程序异常终止。

//bool tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port )//失败 没指定 是IPV4还是IPV6

//    QString string("192.168.112.10")

//    QHostAddress address(QHostAddress::LocalHost)//QHostAddress::Any

//    bool tf =address.setAddress( string )

//    tf =m_pSocket->bind(address,m_port )//失败

//    quint32 ip4Add = 192<<24|168<<16|112<<8|10

//    QHostAddress address(QHostAddress::Any)//QHostAddress::LocalHost

//   蚂埋 address.setAddress( ip4Add )

//    bool tf =m_pSocket->bind(address,m_port )//失败

    //quint32 ip4Add = 192<<24|168<<16|112<<8|100

    //bool tf =m_pSocket->bind(QHostAddress(ip4Add),m_port,QAbstractSocket::ShareAddress )

    /销吵/tf =m_pSocket->bind(QHostAddress(ip4Add),m_port,QAbstractSocket::ReuseAddressHint| QAbstractSocket::ShareAddress | QAbstractSocket::DontShareAddress )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ReuseAddressHint| QAbstractSocket::ShareAddress | QAbstractSocket::DontShareAddress )//失败

//   亏物侍 tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ReuseAddressHint )

//    tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ShareAddress  )

//    tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::DontShareAddress )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::ReuseAddressHint | QAbstractSocket::ShareAddress  )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::DontShareAddress | QAbstractSocket::ReuseAddressHint  )

    //tf =m_pSocket->bind(QHostAddress("192.168.112.100"),m_port,QAbstractSocket::DontShareAddress | QAbstractSocket::ShareAddress  )

    //m_pSocket->bind(QHostAddress::Any, m_port )//方便使用

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