Hi Yashasvi, Yashasvi A.C. schrieb:
Hey,
I used the given code extract but an error saying "no matching function call
to BMessageFilter (message_delivery, message_source, {unkown type})"
occurred. Then, I realised that perhaps it was supposed to be
message_print_hook() function call i.e. with the brackets, while
initialising fMessageFilter. I am not sure what parameters need to be passed
to message_print_hook().
My code kinda looks like:
<code>
BMessage* msg = new BMessage();
BMessageFilter(B_ANY_DELIVERY, B_ANY_SOURCE, message_print_hook(msg, this,
fMessageFilter));
</code>
it could look like this:
static filter_result
message_print_hook(BMessage* msg, BHandler** target,
BMessageFilter* filter)
{
// do something
return B_DISPATCH_MESSAGE;
}
MyView::MyView()
: BView(/*init parent*/)
{
BMessageFilter* filter = new BMessageFilter(B_ANY_DELIVERY,
B_ANY_SOURCE, &message_print_hook);
AddFilter(filter);
}
You should probably read up on how to use function pointers.
http://www.newty.de/fpt/index.html
http://www.haiku-os.org/legacy-docs/bebook/BMessageFilter.html
http://www.haiku-os.org/legacy-docs/bebook/BMessageFilter.html#filter_hook
Regards,
Karsten
