Maybe the best solution would be to return a PropertyPtr (we do not like
returning raw pointers to our internal data so this is better than Property*
... avoids lifetime of the Pointee problems):
PropertyPtr x = myType->getProperty("ID");
if (x)
{
x->what_ever_it_is_you_want_to_do_with_the_property??
}
On 11/01/07, Pete Robbins <[EMAIL PROTECTED]> wrote:
The reason getProperty throws an exception is that it's a exceptional
condition ;-)
The expectation is that you KNOW the names of the properties on the SDO
that you are dealing with. If not, then you would use getPropertyList or
getInstanceProperties and iterate over the list.
I'm assuming in your case that ALL your DO's are expected to have a
particular property (ID)??. In which case isn't it an error if they don't =
exception?
On 11/01/07, Adriano Crestani <[EMAIL PROTECTED]> wrote:
>
> I think it wouldn't be a good idea, because if you want to check if
> there is
> a property with the specified name using hasProperty method and later to
> get
> the property with getProperty(string) it would look for the property
> name
> twice in the property list, for example:
>
> if (hasProperty("ID")) { // look on the list here
> const Property& t = getProperty("ID"); // and here
> }
>
> The best way should be:
>
> int propertyIndex = getPropertyIndex("ID");
>
> if (propertyIndex != -1) { // if it hasn't been found
> const Property& t = getProperty(propertyIndex); // and here to get the
>
> Property directly
> }
>
> However, if the method getPropertyIndex(string) doesn't find any
> property
> with the specified name it also throws a SDOPropertyNotFoundException. I
> think we could purpose not a bool
> Type::hasProperty(std::string propertyName) method, but a int
> Type::getPropertyIndex(string) that returns a -1 value if the property
> name
> is not found, instead of an exception.
>
> Another question, where do I find the sdo spec?
>
> Adriano Crestani
http://osoa.org/display/Main/Service+Data+Objects+Specifications
On 1/11/07, Pete Robbins <[EMAIL PROTECTED] > wrote:
> >
> > On 11/01/07, Adriano Crestani < [EMAIL PROTECTED]> wrote:
> > >
> > > Thanks Pete, I thought there would be an easier way to do this. But
> if
> > you
> > > say so, I think it's the only way. Thanks again!
> >
> >
> > That is what is in the spec. Maybe we could propose a bool
> > Type::hasProperty(std::string propertyName); method
> >
> > Cheers,
> >
> > Adriano Crestani
> > >
> > > On 1/10/07, Pete Robbins <[EMAIL PROTECTED]> wrote:
> > > >
> > > > On 10/01/07, Adriano Crestani < [EMAIL PROTECTED]> wrote:
> > > > >
> > > > > I'm begginer with C++ and I have one doubt about the function
> > defined
> > > in
> > > > > Type.h: "virtual SDO_API const Property& getProperty(const char*
> > > > > propertyName) const = 0". It's supposed to return a reference
> to a
> > > > > Property
> > > > > object that has the name equal to the parameter propertyName,
> but if
> > > > there
> > > > > is no Property object with this name? What does this function
> > return?
> > > >
> > > >
> > > > It would through a SDOPropertyNotFoundException.
> > > >
> > > > I tried to do this...
> > > > >
> > > > > if (type.getProperty ("ID") == NULL)
> > > > >
> > > > > ...but as long as far as I know it's not possible. Is there a
> way to
> >
> > > > check
> > > > > if the function has found Property object with the specified
> name or
> > > > not.
> > > > >
> > > > > Adriano Crestani
> > > >
> > > >
> > > >
> > > > There is no easy way to do this. You would need to wrap the
> > getProperty
> > > in
> > > > a
> > > > try/catch block.
> > > >
> > > > Cheers,
> > > >
> > > > --
> > > > Pete
> > > >
> > > >
> > >
> > >
> >
> >
> > --
> > Pete
> >
> >
>
>
--
Pete
--
Pete
