On 21 November 2013 22:40, Sean P. DeNigris <s...@clipperadams.com> wrote:
> I'm wrapping the FMOD cross-platform audio library. The code is MIT and > lives > at http://smalltalkhub.com/#!/~SeanDeNigris/FMOD > > ======== > Problem #1: > ======== > > I'm calling into the FMOD library with: > primStoreIsPlaying: channelHandle in: isPlayingHandle > <primitive: #primitiveNativeCall module: #NativeBoostPlugin> > > "FMOD_RESULT FMOD_Channel_IsPlaying( > FMOD_CHANNEL *channel, > bool *isplaying);" > > ^ self nbCall: #(FMOD_RESULT > FMOD_Channel_IsPlaying(NBExternalAddress > channel, NBExternalAddress isPlayingHandle)). > > I call the above with: > isPlaying > | isPlaying | > isPlaying := NBExternalAddress new. > self primStoreIsPlaying: channel in: isPlaying. > ^ isPlaying value > 0. > > isPlaying is always 0. The method works directly from C with: > int isPlaying = 1; > while (isPlaying) { > FMOD_Channel_IsPlaying(channel, &isPlaying); > } > > I also tried changing the callout signature to "... bool* isPlayingHandle)" > and passing "isPlaying := true." instead of using the NBExternalAddress > stuff. > > err.. again, you must pass an address where value will be stored, ^ self nbCall: #(FMOD_RESULT FMOD_Channel_IsPlaying( > > NBExternalAddress channel, NBExternalAddress * isPlayingHandle)). otherwise you passing NULL pointer, and i quite surprised it not segfaults when you call it like that (looks like they have a check in the library ) you can also use NBExternalTypeValue for that: boolValueClass := NBExternalTypeValue ofType: 'bool'. "sure thing, creating anonymous class for each call is overkill, this should be done once, somewhere else" boolValue := boolValueClass new. self callTheThingWith: boolValue. boolValue value ifTrue: [... blah] (and this will work, assuming you have bool* in signature for this argument). I have a few more questions, but this is the most pressing as it's holding > up any further development. > > Thanks! > > > > ----- > Cheers, > Sean > -- > View this message in context: > http://forum.world.st/NativeBoost-Questions-while-wrapping-FMOD-tp4724116.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > -- Best regards, Igor Stasenko.
