Subclassing QException

samuelpdrouin

Hi,

I want to subclass QException in order to handle QSqlError. My current exception handling code is the following :

try
{
    query.exec(queryString);
    throw query.lastError().text();
}
catch (QString &e)
{
    if (!e.isEmpty())
    {
        bool ret = QERMessageBox(e);
        if (ret = true)
            // Code
    }
}

I thought of reimplanting QException like this :

class SqlException: public QException

{
public:
    SqlException(QString const& text=" ") throw()
         :m_phrase(text)
    {}
     virtual const QChar* what() const throw()
     {
         return m_text.data();
     }
     void SqlException::raise() const
    {
         SqlException e = *this;
         throw e;
    }
    SqlException *SqlException::clone() const
    {
         return new SqlException(*this);
    }
     virtual ~Erreur() throw()
    {}

private:
    string m_text; \\ QSqlQuery.lastError().text();
};

However I don't understand the use of the raise() and the clone() function. Also, I get the following error from the what function when compiling : return cannot convert from const QChat * to const char *.

SGaist

Hi,

Raise is to actually throw the exception and clone is to create a copy of your exception. As for your other error m_text is a string and not a QString.