Hi, I'd need high resolution, stable timing and sleep for Win32 apps and it seems to me the Windows multimedia timers should be used for this purpose. So, is there already support for them or is it planned in the future if not? I've searched various PPM reps with no luck so far. Which timers does Time::HiRes use for Windows internally?
I've also been considering wrapping the functionality using Win32::API. As with so many other things in Windows, though, the API for them requires that you implement a normal Win32 callback function that gets called when the timer fiers. Is it possible to do callbacks using Win32::API? how much overhead does using Win32::API mean, i.e. does it make sense to even attempt wrapping high res timing? I've casually browsed through the Win32::API manual page but found no mention of callbacks in the datatypes, though structs are well supported. If all else fails, I might consider writing a wrapper in C. I'm not a very good C coder, however, and have no idea of how the APi is like apart from having browsed advanced PErl Programming and Perl Internals a little. I've read Perl and C integration is much harder than in some other langs but cannot really comment on that. Are there good tutorials for writing C extensions, at any rate? The background for this thing is that since I like Perl I decided to code myself one of the first keyboard usable drum machines out there in it, using modules like Win32:::MIDI and Win32::GUI. IN terms of timing it means a heart beat timer for 32nd notes (from about 200 ms down to 30 ms) and a high res sleep for implementing shuffle using MIDI on the wire. I'm using Win32::GUI::Timer and Win32::Sleep for these. For a dual core machine with high res timers it ticks away quite steadily but does not exactly match the tempo and timing. For an older laptop lacking these timers, though, the timing is bad enough to be virtually unusable. CPu usage does not appear to be the problem, If someone happens to be interested in this project as an end user or coder, in particular, here's a link to an early alpha version, though the GUi code is messy and the architecture could be much better: http://www.student.oulu.fi/~vtatila/beats_me.html Any help appreciated. I've already asked in the Win32::GUI list so appologies for any redundancy. -- With kind regards Veli-Pekka Tätilä ([EMAIL PROTECTED]) Accessibility, game music, synthesizers and programming: http://www.student.oulu.fi/~vtatila _______________________________________________ Perl-Win32-Users mailing list Perl-Win32-Users@listserv.ActiveState.com To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
