Ghrrr, excuse me for the noise. I had not read correctly the docs of
Julia's "cfunction" function. I don't need to know the parameters in
advance, only their types and that I know. So I got it working (at least
for a simple example).
Joaquim
> Hi,
>
> First time here and new to IUP but unconscious enough to attack a
> challenging problem.
>
> I am playing around trying to port bits of IUP to Julia and already made
> it work for a couple of examples of the examples section, but got stuck
> in the callbacks mystery.
>
> Take the button.c example as an example
>
> It has a line that sets the callback
>
> IupSetCallback( btn_image, "ACTION", (Icallback) btn_image_button_cb );
>
> and the beginning of the CB reads like
>
> int btn_image_button_cb( Ihandle *self, int b, int e ) {
> /* If the left button changed its state... */
> if( b == IUP_BUTTON1 ) {
> ...
>
> Now, the big mystery to me is where does the btn_image_button_cb()
> function gets its arguments from? Note that in the IupSetCallback() call
> there are no arguments transmitted but they managed to find their way to
> btn_image_button_cb(). And why only those three and not the all
> collection mentioned in the docs?
>
> Understanding this and finding how to set the args is crucial for the
> Julia port because there one has to declare the arguments list as well
> as their types.
> For example as in (this is a Julia line)
>
> IupSetCallback (btn_exit, "ACTION", cfunction(btn_exit_cb, Int, (),))
>
> which works because btn_exit_cb() can be made to work without any input
> arguments.
>
> Thanks for any help
>
> Joaquim
>
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Find What Matters Most in Your Big Data with HPCC Systems
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Leverages Graph Analysis for Fast Processing & Easy Data Exploration
http://p.sf.net/sfu/hpccsystems
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