Re: Add plugin_if_get_framenr()

[Roland Knall <rknall () gmail com>]

Hi

The plugin_if functionality exists, because methods called by plugins run
in a different thread context than the gui. Therefore, if you want to gui
to act in a certain way, you have to somehow cross the context to achieve
whatever you want to do.

Your proposed idea goes in the other direction. You just want the gui to
provide you with information about the currently selected frame nr. The
approach here would be to add such a functionality in a ui/*.h file, which
exposes this information for both gtk and qt interfaces (for now you would
need to implement both) and allow anyone to get this information without a
thread change.

The plugin if functions also by default do not return anything, as they can
(at least theoratically) be bound to multiple outputs. the
plugin_if_goto_frame could not only trigger the callback for the qt
interface, but for a simultanously running gtk interface as well. In
reality, this will not happen, but it could. So if you would ask the
interface to give you the current frame number and 2-3 different systems
are connected, which of the returned values (and it must be returned by a
ref-parameter not return value) will you accept?

So, to summarize, no, the plugin-if is not the right thing to use, this is
a funcionality best exposed in some ui/*.h file, maybe a new one, and an
interface the gui implementations provide.

regards,
Roland

On Mon, Jan 4, 2016 at 4:32 PM, Paul Offord <Paul.Offord () advance7 com>
wrote:

> Hi,
>
>
>
> I’d like to add a new Plugin IF function to get the currently displayed
> frame number.  I believe I can do it like this:
>
>    1. Create the function that does the work in main_window.cpp
>       - static guint32 plugin_if_mainwindow_get_framenr()
>    2. Create plugin_if hook in main_window.cpp
>       - plugin_if_register_gui_cb(PLUGIN_IF_GET_FRAMENR,
>       plugin_if_mainwindow_get_framenr);
>    3. Add an entry to the typedef enum for plugin_if_callback_t in
>    plugin_if.h
>       - PLUGIN_IF_GET_FRAMENR
>    4. Add a function to plugin_if.c such as:
>       - extern guint32 get_current_framenr()
>    5. Make this function available to plugins by adding the following to
>    plugin_if.h
>       - WS_DLL_PUBLIC guint32 plugin_if_get_framenr();
>
> Before I get carried away writing code
>
>
>
> ·        Would this be acceptable as an addition to Wireshark?
>
> ·        Is the above correct?
>
>
>
> Thanks and regards…Paul
>
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