This is a classic C++/OS problem. Operating Systems don't understand
the hidden 'this' argument which is passed to non static member
functions.
Some OS callbacks, like Windows Timer callbacks, have a user-data
parameter. You specify the param when you create the timer, the idea
being that you can pass a context block, or whatever, in and use the
same proc for multiple instances. In those cases a common approach is
to create a static callback function in your class and pass in the
'this' pointer as the user data. The callback then casts the userdata
back to a class pointer.
I don't recall PalmOS Tables offering a user param, I seem to recall
that they pass the table pointer in. In these instances you need to
find a way to associate a particular OS object with your 'object'. You
could ask the OS to do it with something like the Feature Manager, but
it would probably be a lot more effective to just keep your own linked
list.
Or, if you only want to have one table instantiated at a time, make a
static class pointer to go with your static callback.
-jjf
-----Original Message-----
From: Dan Hewins [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, February 22, 2000 4:28 PM
To: Palm Developer Forum
Cc: [EMAIL PROTECTED]
Subject: C++ Palm Apps (Teenee)
I saw Teenee on Roadcoders. Nice. I looked through it and I didn't
see anthing on Table support in Teenee. Have you addressed the issue
of Tables in C++? I am curious becuse I am creating a C++ Palm OS
app in which a class takes care of all of the table stuff (loading,
drawing, etc.) and I have run into a road block. I want to set a
call-back for the table item draw routine and I can't get it to work
any way I can think of. I tried this->DrawItem but that wouldn't
compile. The best I can think of would be to create a "wrapper"
function in the "real" world that calls my class' draw routine. But,
that really destroys the black-box idea... Any thought or insight
would be appreciated.
Thanks,
Dan Hewins
Synergy Solutions, Inc.
--
For information on using the Palm Developer Forums, or to unsubscribe,
please see http://www.palm.com/devzone/mailinglists.html
--
For information on using the Palm Developer Forums, or to unsubscribe, please see
http://www.palm.com/devzone/mailinglists.html
