#ponylang on 2016-10-12 — irc logs at freenode.irclog.whitequark.org

2016-03-17 19:44 jemc changed the topic of #ponylang to: Welcome! Please check out our Code of Conduct => https://github.com/ponylang/ponyc/blob/master/CODE_OF_CONDUCT.md | Public IRC logs are available => http://irclog.whitequark.org/ponylang

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19:54 <jemc> https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627

19:55 <jemc> who wants to spearhead the efforts for pony-to-webassembly? :D

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20:17 <Unit158> I'm missing some background knowledge on how to do the FFI stuff properly. I don't quite understand how the callbacks are supposed to work

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20:19 <Unit158> In PortAudio, it seems that there is no "receiver object"

20:24 <doublec> Unit158: What's the type of the callback that PortAudio is expecting?

20:24 <doublec> Unit158: if it's this http://portaudio.com/docs/v19-doxydocs/writing_a_callback.html

20:25 <Unit158> yeah

20:25 <doublec> Unit158: then you'd pass the Pony object as userData

20:25 <Unit158> Ok, so I'd need a library to at least change the order of the arguments. Correct?

20:26 <doublec> yeah, you need to have a callback where the first argument of the callback is the pony object

20:26 <doublec> Which most libraries probably don't do

20:27 <doublec> So you'd probably have a C based callback function that massages the actual callback to the Pony function with the userdata as the first argument

20:27 <doublec> Where userdata is the pointer to the pony object

20:27 <doublec> See the last paragraph of https://tutorial.ponylang.org/c-ffi/callbacks.html

20:28 <Unit158> I might see about coding this in C# then, just to avoid dealing with C. I can never get anything to compile (windows)

20:28 <doublec> Unit158: see https://github.com/ponylang/ponyc/issues/701

20:28 <Unit158> neato, thank you for the help :)

20:29 <doublec> np

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