The chrome debugger says: [image: Imatge inserida 1] And the Firefox: [image: Imatge inserida 2]
2015-10-29 15:49 GMT-07:00 Pau Ballart <[email protected]>: > Hello, > > I've been working hard with my implementation and I almost got it. > I'd say it's working fine in Safari but I got a DOM exception in Chrome > and Firefox and I have no idea why. the DOM Exception doesn't give any > message nor error code... > The error happens when inside my C code i have an EM_ASM_ARGS() block and > inside this I use the Javascript WebCrypto API to decrypt the image. The > think is the same decrypt method works when I use it outside emscripten in > a normal webpage and inside emscripten it works with Safari! But why it > doesn't work in Chrome? > > Thanks > > 2015-10-20 21:24 GMT-07:00 Alon Zakai <[email protected]>: > >> Yes, malloc the space, and memcpy the contents to that space. >> >> On Tue, Oct 20, 2015 at 8:20 PM, Pau Ballart <[email protected]> wrote: >> >>> I did some tries with no success. >>> If I have this declaration: >>> *int p3stuff(char *imgUrl, unsigned char *wrappedkey);* >>> How can I make sure the contents of imgUrl will persist even out of the >>> scope? >>> Because it's a pointer so maybe I need to malloc first the space and >>> then memcpy the contents? >>> Suppose I have a global var like this *char *imageUrl;* I'd be very >>> thankful if you can provide me an example. >>> >>> 2015-10-20 15:57 GMT-07:00 Alon Zakai <[email protected]>: >>> >>>> Yes, if you want something to live beyond the current function call, >>>> you should use malloc(). That will only be reused after you call free() on >>>> it. >>>> >>>> On Tue, Oct 20, 2015 at 3:51 PM, Pau Ballart <[email protected]> >>>> wrote: >>>> >>>>> Updated to 1.35 but same problem... >>>>> Maybe the question to formulate would be: How can I save in a >>>>> global/static variable some information so that I can acces it later in >>>>> the >>>>> callback function and make sure it's not overwritten? >>>>> What do you think about using malloc() somehow? Would it work? >>>>> >>>>> 2015-10-20 14:18 GMT-07:00 Alon Zakai <[email protected]>: >>>>> >>>>>> Might be worth trying current master (or incoming) then, which is now >>>>>> 1.35.0. >>>>>> >>>>>> On Tue, Oct 20, 2015 at 2:16 PM, Pau Ballart <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> $ emcc -v >>>>>>> emcc (Emscripten gcc/clang-like replacement + linker emulating GNU >>>>>>> ld) 1.34.8 >>>>>>> clang version 3.7.0 >>>>>>> Target: x86_64-apple-darwin15.0.0 >>>>>>> Thread model: posix >>>>>>> INFO root: (Emscripten: Running sanity checks) >>>>>>> >>>>>>> 2015-10-20 14:05 GMT-07:00 Alon Zakai <[email protected]>: >>>>>>> >>>>>>>> One possible issue is that if those values are on the stack, and >>>>>>>> the scope exits, then that stack memory might be reused. For example >>>>>>>> this >>>>>>>> is unsafe: >>>>>>>> >>>>>>>> { >>>>>>>> char buffer[100]; >>>>>>>> // write into buffer >>>>>>>> emscripten_async_wget(..., (void*)buffer); >>>>>>>> } >>>>>>>> >>>>>>>> The buffer will be released before the async callback occurs, and >>>>>>>> other data might be written into it before the callback reads from it. >>>>>>>> >>>>>>>> Which version of emscripten are you using, btw? I remember a while >>>>>>>> back we had a bug around this. >>>>>>>> >>>>>>>> On Tue, Oct 20, 2015 at 1:36 PM, Pau Ballart <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Hello, >>>>>>>>> >>>>>>>>> After some research and some refactor I did the following: >>>>>>>>> >>>>>>>>> - In my p3stuff function I >>>>>>>>> call emscripten_set_main_loop(wait_wgets, 0, 0); so the >>>>>>>>> application is not >>>>>>>>> terminated. >>>>>>>>> - In wait_wgets I call the emscripten_async_wget(imageUrl, >>>>>>>>> path, onLoaded, onError); only the first time the method is called. >>>>>>>>> - In the onLoaded callback I >>>>>>>>> call emscripten_cancel_main_loop(); and then I call my c code that >>>>>>>>> perform >>>>>>>>> the jpeg stuff. >>>>>>>>> >>>>>>>>> Problem is: >>>>>>>>> the p3stuff function has 2 arguments: int p3stuff(char *imgUrl, >>>>>>>>> unsigned char *wrappedkey) >>>>>>>>> When it's called i have two global variables unsigned char >>>>>>>>> *wrappedKey; and char *imageUrl; which are assigned with the argument >>>>>>>>> like >>>>>>>>> that: >>>>>>>>> >>>>>>>>> wrappedKey = wrappedkey; >>>>>>>>> imageUrl = imgUrl; >>>>>>>>> >>>>>>>>> I do that in order to access the image url from the wait_wgets() >>>>>>>>> or the wrapped key from the onLoaded callback but I think there is >>>>>>>>> some >>>>>>>>> memory management problems cause if I print the url just before >>>>>>>>> calling >>>>>>>>> emscripten_async_wget the imageUrl variable content is completely >>>>>>>>> rubbish >>>>>>>>> but id I don't print anything it works. >>>>>>>>> >>>>>>>>> So how can I use the global variables in C in order to not get >>>>>>>>> overwritten? Maybe using malloc, or memcopy? >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> >>>>>>>>> Pau >>>>>>>>> >>>>>>>>> 2015-10-19 10:53 GMT-07:00 Pau Ballart <[email protected]>: >>>>>>>>> >>>>>>>>>> Okay I will try the async version and let you know. >>>>>>>>>> >>>>>>>>>> Thanks >>>>>>>>>> >>>>>>>>>> 2015-10-17 19:37 GMT-07:00 Alon Zakai <[email protected]>: >>>>>>>>>> >>>>>>>>>>> The only tricky thing with emscripten_wget is that as mentioned >>>>>>>>>>> in the docs, >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> http://kripken.github.io/emscripten-site/docs/api_reference/emscripten.h.html#c.emscripten_wget >>>>>>>>>>> >>>>>>>>>>> it requires the ASYNCIFY option. It's easier in general to use >>>>>>>>>>> the async version, emscripten_async_wget, which does not require >>>>>>>>>>> ASYNCIFY. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Sat, Oct 17, 2015 at 10:47 AM, Pau Ballart < >>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>> >>>>>>>>>>>> I think the php code is correct so I'm just trying to download >>>>>>>>>>>> an image and process it's data but I think I'm missing something >>>>>>>>>>>> about the >>>>>>>>>>>> lifecycle or wget function because I get unexpected exit errors. >>>>>>>>>>>> >>>>>>>>>>>> So I'd like to know if the emscripten_wget(imgUrl, path); is >>>>>>>>>>>> correct because I have the weirdest behaviour ever that depending >>>>>>>>>>>> on the >>>>>>>>>>>> p3stuff function param "wrappedkey" the download succeeds or >>>>>>>>>>>> not. >>>>>>>>>>>> >>>>>>>>>>>> 2015-10-15 17:07 GMT-07:00 Alon Zakai <[email protected]>: >>>>>>>>>>>> >>>>>>>>>>>>> I see you have >>>>>>>>>>>>> >>>>>>>>>>>>> P3Func = Module.cwrap('p3stuff', 'number', ['string', >>>>>>>>>>>>> 'string']); >>>>>>>>>>>>> >>>>>>>>>>>>> which looks good. You can then call it with something like >>>>>>>>>>>>> >>>>>>>>>>>>> result = P3Func('first', 'second'); >>>>>>>>>>>>> >>>>>>>>>>>>> which I see you are doing. What part of that are you trying to >>>>>>>>>>>>> improve? >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> On Thu, Oct 15, 2015 at 12:59 PM, Pau Ballart < >>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> Okay so the php is just calling a function I declared. >>>>>>>>>>>>>> Because I need to pass the image url as an argument and a key, I >>>>>>>>>>>>>> don't know >>>>>>>>>>>>>> how to do it using the main function so I changed the main >>>>>>>>>>>>>> function for >>>>>>>>>>>>>> this one with the two arguments and then called this function >>>>>>>>>>>>>> from my php >>>>>>>>>>>>>> code. >>>>>>>>>>>>>> Is there a better way to call emscripten passing parameters? >>>>>>>>>>>>>> >>>>>>>>>>>>>> Thanks. >>>>>>>>>>>>>> >>>>>>>>>>>>>> 2015-10-15 12:55 GMT-07:00 Alon Zakai <[email protected]>: >>>>>>>>>>>>>> >>>>>>>>>>>>>>> It would be good to focus the question more, it's hard to >>>>>>>>>>>>>>> tell what the core issue is. Try to reduce the problem to just >>>>>>>>>>>>>>> one concrete >>>>>>>>>>>>>>> thing, like just loading a file, and doing it without that >>>>>>>>>>>>>>> custom PHP >>>>>>>>>>>>>>> script, for example. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> On Thu, Oct 15, 2015 at 12:27 PM, Pau Ballart < >>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Hello developers, >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> I'm starting a project and I'm new at Javascript and >>>>>>>>>>>>>>>> emscripten. I'm trying to download some image data from a >>>>>>>>>>>>>>>> server and then >>>>>>>>>>>>>>>> process it using some c functions I already have working. I >>>>>>>>>>>>>>>> asked this >>>>>>>>>>>>>>>> question in Stackoverflow so I share you the link and maybe >>>>>>>>>>>>>>>> one of you can >>>>>>>>>>>>>>>> help me. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> http://stackoverflow.com/questions/33087205/emscripten-code-for-image-data-download-using-emscripten-wget-or-emscripten-asyn >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Thank you, >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Pau B >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>>>>> Google Groups "emscripten-discuss" group. >>>>>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails >>>>>>>>>>>>>>>> from it, send an email to >>>>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>> You received this message because you are subscribed to a >>>>>>>>>>>>>>> topic in the Google Groups "emscripten-discuss" group. >>>>>>>>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>>>>>>>> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >>>>>>>>>>>>>>> . >>>>>>>>>>>>>>> To unsubscribe from this group and all its topics, send an >>>>>>>>>>>>>>> email to [email protected]. >>>>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> -- >>>>>>>>>>>>>> Pau Ballart >>>>>>>>>>>>>> >>>>>>>>>>>>>> -- >>>>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>>>> Google Groups "emscripten-discuss" group. >>>>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from >>>>>>>>>>>>>> it, send an email to >>>>>>>>>>>>>> [email protected]. >>>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> -- >>>>>>>>>>>>> You received this message because you are subscribed to a >>>>>>>>>>>>> topic in the Google Groups "emscripten-discuss" group. >>>>>>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>>>>>> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >>>>>>>>>>>>> . >>>>>>>>>>>>> To unsubscribe from this group and all its topics, send an >>>>>>>>>>>>> email to [email protected]. >>>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>>>> Pau Ballart >>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>>>> You received this message because you are subscribed to the >>>>>>>>>>>> Google Groups "emscripten-discuss" group. >>>>>>>>>>>> To unsubscribe from this group and stop receiving emails from >>>>>>>>>>>> it, send an email to >>>>>>>>>>>> [email protected]. >>>>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> You received this message because you are subscribed to a topic >>>>>>>>>>> in the Google Groups "emscripten-discuss" group. >>>>>>>>>>> To unsubscribe from this topic, visit >>>>>>>>>>> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >>>>>>>>>>> . >>>>>>>>>>> To unsubscribe from this group and all its topics, send an email >>>>>>>>>>> to [email protected]. >>>>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> Pau Ballart >>>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> -- >>>>>>>>> Pau Ballart >>>>>>>>> >>>>>>>>> -- >>>>>>>>> You received this message because you are subscribed to the Google >>>>>>>>> Groups "emscripten-discuss" group. >>>>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>>>> send an email to [email protected]. >>>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to a topic in >>>>>>>> the Google Groups "emscripten-discuss" group. >>>>>>>> To unsubscribe from this topic, visit >>>>>>>> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >>>>>>>> . >>>>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>>>> [email protected]. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Pau Ballart >>>>>>> >>>>>>> -- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "emscripten-discuss" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>> >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to a topic in >>>>>> the Google Groups "emscripten-discuss" group. >>>>>> To unsubscribe from this topic, visit >>>>>> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >>>>>> . >>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>> [email protected]. >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Pau Ballart >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "emscripten-discuss" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>> >>>> -- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "emscripten-discuss" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >>>> . >>>> To unsubscribe from this group and all its topics, send an email to >>>> [email protected]. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> >>> -- >>> Pau Ballart >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "emscripten-discuss" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "emscripten-discuss" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/emscripten-discuss/BEb-1mjDvZI/unsubscribe >> . >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Pau Ballart > -- Pau Ballart -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
