Re: This MIDI stuff, would someone be interested in reviewing my code?

[Brian Drummond <brian_drummond@btconnect.com>]

On Tue, 09 Mar 2010 10:21:00 +0000, John McCabe <john@nospam.assen.demon.co.uk>
wrote:

>On Mon, 08 Mar 2010 10:24:26 -0700, "Jeffrey R. Carter"
><spam.jrcarter.not@spam.acm.org> wrote:

>>I would make Numinputdevices and Numoutputdevices constants.
>
>They're not constants though - they're discovered from the
>midiInGetNumDevs and midiOutGetnumDevs functions.

But you can call those functions in an initialisation clause on the declaration.
Then they remain constant within the begin..end section, so you can declare them
as constants.

>>For this small 
>>example, I would do the same with Midiincaps and Midioutcaps;

>The point of allocating/freeing them was to get round the fact that,
>when they were declared in the declarative part of the main function,
>I seemed to have to use 'Unchecked_Access when passing them to
>midiInGetDevCaps/midiOutGetDevCaps.

Look into the "aliased" keyword. Unlike C, the compiler will assume a local
variable is never aliased (and can be optimised) - unless you declare it
aliased, to say there may be a pointer to it. Declare them aliased and you
shouldn't need Unchecked_Access.

- Brian