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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