[vbox-dev] Type conflicts in vbox C API

[Taowei Luo]

Thank you.
And the SDKRef.pdf is really useful to me.


2014-06-02 21:52 GMT+08:00 Frank Mehnert <frank.mehnert at oracle.com>:

> Hi Taowei,
>
> On Monday 02 June 2014 12:28:35 Taowei Luo wrote:
> > Hi, I'm developing the vbox drivers for libvirt, with the vbox c api.
> >
> > I have a question. Is there any type conflict in vbox C API between
> > different versions?
> >
> > For example, I have a var type named nsresult. In some C API versions, It
> > defines nsresult as type PRUint32. Is it true that all nsresults (in
> > different versions) will be defined as the same type PRUint32?
> >
> > I know it may be false for structs which have function pointers. But in
> > other cases, especially basic types, is the type compatible with all c
> api
> > versions?
>
> nsresult is always PRUint32. Note that this code is always a status
> code and will never include any pointer or similar. Values bigger
> than 0x80000000 are used for errors, NS_OK is defined as 0.
>
> In general, the API will not differ between VBox versions of the same
> stable branch but the API might change with a new major release. For
> example, VBox 4.3.2 and 4.3.4 have the same API while VBox 4.2.2 and
> 4.3.2 differ a bit. Usually the changes between different API versions
> are small and all changes are documented in section 12 of the VirtualBox
> SDK documentation (SDKRef.pdf, not UserManual.pdf!)
>
> Kind regards,
>
> Frank
> --
> Dr.-Ing. Frank Mehnert | Software Development Director, VirtualBox
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