yes, I made a mistake… the problem of not being capable of test here :( 1 minute.
Esteban > On 01 Jul 2016, at 13:56, Julien Delplanque <jul...@tamere.eu> wrote: > > Ok, now I get a different exception! :-) > > "MessageNotUnderstood: LUDevice class>>fromHandle:" > > when executing: "array first." > > Where LUDevice is defined like this: > > FFIOpaqueObject subclass: #LUDevice > instanceVariableNames: '' > classVariableNames: '' > package: 'LibUsb-Kernel' > > Julien > > > On 01/07/16 13:51, Esteban Lorenzano wrote: >> I need you to test :) >> >> can you execute this: >> >> (ConfigurationOfUnifiedFFI project version: #development) load. >> >> and then retry your example? >> >> thanks, >> Esteban >> >> ps: this became pharo-dev, but well… still here :) >> >>> On 01 Jul 2016, at 13:48, Julien Delplanque <jul...@tamere.eu> wrote: >>> >>> Oh, ok :p >>> >>> Can you notify me know when the bug will be resolved? >>> >>> Thanks, >>> >>> Julien >>> >>> >>> On 01/07/16 13:36, Esteban Lorenzano wrote: >>>> … and now you hit a bug. >>>> bah, an “non implemented feature” :P >>>> >>>> I never tested arrays with complex types. >>>> it should not be hard… I will provide a fix. >>>> >>>> Esteban >>>> >>>> >>>>> On 01 Jul 2016, at 13:30, Julien Delplanque <jul...@tamere.eu> wrote: >>>>> >>>>> Ok, the ffi call is done without problem with your method thanks. :) >>>>> >>>>> But now that I have the array, when I try to access the first element >>>>> using: >>>>> >>>>> array first. >>>>> >>>>> I get a exception saying I need to override a method: >>>>> >>>>> "SubclassResponsibility: FFIOpaqueObjectType had the subclass >>>>> responsibility to implement #basicHandle:at:" >>>>> >>>>> I looked at others implementors but I am not sure of how I should >>>>> override it, nor if I should. >>>>> >>>>> Thanks for the time your taking to answer me. :-) >>>>> >>>>> Julien >>>>> >>>>> On 01/07/16 12:29, Esteban Lorenzano wrote: >>>>>>> On 01 Jul 2016, at 12:27, Esteban Lorenzano <esteba...@gmail.com> wrote: >>>>>>> >>>>>>> hi, >>>>>>> >>>>>>> this is because you want to get an array with opaque objects. Do not >>>>>>> let the *** confuses you… cwhat you actually want, conceptually is >>>>>>> something like this: >>>>>>> >>>>>>> *((FFIOpaqueObject*)[]) >>>>>>> >>>>>>> means: you pass the address of an array of opaque types (who are always >>>>>>> pointers). >>>>>>> >>>>>>> So, what you need to pass is the address of an array… you will need to >>>>>>> work a bit here, since translation is not automatic. >>>>>>> >>>>>>> 1) you need to declare your type. Let’ say it will be: >>>>>>> >>>>>>> FFIOpaqueObject subclass: USBDevice. >>>>>>> >>>>>>> 2) then you need to get the pointer to this array. You need to rewrite >>>>>>> you code as this: >>>>>>> >>>>>>> arrayPtr := ExternalAddress new. >>>>>>> size := self getDevice: ctx list: arrayPtr. >>>>>>> >>>>>>> getDevice: ctx list: list >>>>>>> ^ self ffiCall: #(size_t libusb_get_device_list (libusb_context >>>>>>> *ctx, void **list)) >>>>>>> >>>>>>> NOTE that we change the type to "void **”. This is because this is what >>>>>>> you actually want: the array of devices >>>>>>> >>>>>>> 3) now you will have size and arrayPtr. Then you declare the array: >>>>>>> >>>>>>> array := FFIExternalArray fromPointer: arrayPtr type: USBDevice >>>>>> sorry, this expression (while possible) does not stops in “size”… it has >>>>>> to be like this, instead: >>>>>> >>>>>> array := FFIExternalArray fromPointer: arrayPtr type: USBDevice size: >>>>>> size. “you already has the size for the result" >>>>>> >>>>>>> … and you should be able to iterate this array normally :) >>>>>>> >>>>>>> let me know if this works for you… I’m “coding in mail client”, so it >>>>>>> can fail :P >>>>>>> >>>>>>> cheers, >>>>>>> Esteban >>>>>>> >>>>>>> >>>>>>>> On 01 Jul 2016, at 12:02, Julien Delplanque <jul...@tamere.eu> wrote: >>>>>>>> >>>>>>>> Thanks, it works I get an instance of FFIOpaqueObject. >>>>>>>> >>>>>>>> But how do I get a specific libusb_device object from the list? >>>>>>>> >>>>>>>> Thanks again for you quick answer :-). >>>>>>>> >>>>>>>> Julien >>>>>>>> >>>>>>>> On 01/07/16 11:44, Esteban Lorenzano wrote: >>>>>>>>> Hi, >>>>>>>>> >>>>>>>>> an opaque structure is not an FFIExternalObject but an >>>>>>>>> FFIOpaqueObject. >>>>>>>>> in that case, something like (simplified): >>>>>>>>> >>>>>>>>> ctx := (your context). >>>>>>>>> list := FFIOpaqueObject new. >>>>>>>>> size := self getDevice: ctx list: list. >>>>>>>>> >>>>>>>>> getDevice: ctx list: list >>>>>>>>> ^ self ffiCall: #(size_t libusb_get_device_list (libusb_context >>>>>>>>> *ctx, FFIOpaqueObject ***list)) >>>>>>>>> >>>>>>>>> should work (note that of course you can make libusb_device an alias >>>>>>>>> for your type… that does not matters much, this is just a >>>>>>>>> simplification). >>>>>>>>> >>>>>>>>> if this does not works, if you can provide me code to reproduce it, I >>>>>>>>> can give it a shot and see what happens :) >>>>>>>>> >>>>>>>>> Esteban >>>>>>>>> >>>>>>>>>> On 01 Jul 2016, at 11:19, Julien Delplanque <jul...@tamere.eu> wrote: >>>>>>>>>> >>>>>>>>>> Hello everyone, >>>>>>>>>> >>>>>>>>>> I have a question about the UFFI API. I have the following function: >>>>>>>>>> >>>>>>>>>> ssize_t libusb_get_device_list (libusb_context *ctx, libusb_device >>>>>>>>>> ***list) >>>>>>>>>> >>>>>>>>>> where libusb_device is an opaque structure. >>>>>>>>>> >>>>>>>>>> I made a type mapping "ssize_t" -> "int" and an object inheriting >>>>>>>>>> from FFIExternalObject for the "libusb_context" (others methods >>>>>>>>>> using it are working). >>>>>>>>>> >>>>>>>>>> I can not find how to get an array filled with libusb_device using >>>>>>>>>> UFFI from Pharo. :-( >>>>>>>>>> >>>>>>>>>> Thanks in advance, >>>>>>>>>> >>>>>>>>>> Julien >>>>>>>>>> >>> >> > >
