Re: [Pharo-users] [UFFI] Call a function where argument type is char ** (argv)

Hi, sorry late response, I just missed this mails. but… I do not have much to say… what you did should work. Except (I think I’d need to look at your code closer) you need to change the argument of argv to FFIExternalArray*, or you need to pass the handle to the function. Something like this: | externalArray parameters | parameters := #('R' '--no-save' 'silent'). externalArray := (FFIExternalArray externalNewType: 'void*' size: parameters size) autoRelease. parameters withIndexDo: [ :string :index | externalArray at: index put: (ExternalAddress fromString: string) autoRelease ]. self prim_initEmbeddedRargc: parameters size argv: externalArray getHandle (with same primitive call) or without the #getHandle message and a primitive call: self ffiCall: #(int Rf_initEmbeddedR(int argc, FFIExternalArray* argv)) AFAIK, that should work… if not I’d need to take a better look, because is maybe a bug :P Esteban

On 03 Jun 2016, at 18:50, Blondeau Vincent <vincent.blondeau@worldline.com> wrote:

Hello,

So, we tried with Thibault Raffaillac and we succeed to have this kind of code:

| externalArray | parameters := #('R' '--no-save' 'silent'). [ externalArray := FFIExternalArray externalNewType: 'void*' size: parameters size. parameters withIndexDo: [ :string :index | externalArray at: index put: (ExternalAddress fromString: string) ]. self prim_initEmbeddedRargc: parameters size argv: externalArray ] ensure: [ externalArray ifNotNil: [ externalArray do: [ :item | item ifNotNil: [ :e | e free ] ]. externalArray free ] ]

with a primitive call: self ffiCall: #(int Rf_initEmbeddedR(int argc, char ** argv))

However, it still doesn't work because the VM is crashing during the call to the primitive.

Does the translation from the Nativeboost version is accurate?

Thanks in advance for your help,

Vincent

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-----Message d'origine----- De : Pharo-users [mailto:pharo-users-bounces@lists.pharo.org] De la part de Julien Delplanque Envoyé : mercredi 1 juin 2016 18:49 À : pharo-users@lists.pharo.org Objet : Re: [Pharo-users] [UFFI] Call a function where argument type is char ** (argv)

Hello,

I asked a simililar question some days ago, maybe this [1] can help.

Regards,

Julien

Links:

[1]: http://forum.world.st/Unified-FFI-pointer-of-String-as-function-parameter- td4898066.html

On 31/05/16 16:28, Blondeau Vincent wrote:

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TL;DR: How to pass as argument an array of Strings (char **) with Unified- FFI?

Vincent

De : Blondeau Vincent Envoyé : mercredi 25 mai 2016 13:58 À : Pharo Development List Objet : [UFFI] Call a function where argument type is char ** (argv)

Hello,

I have written a R bridge in Pharo and I would like to migrate it from NativeBoost to UFFI. Most of the changes are easy to do but I am stuck to a double pointer problem. I have to call the function: int Rf_initEmbeddedR(int argc, char ** argv). I know how to give the int but the char ** is a problem. It is an array of Strings.

With NB, I managed to have this (working) code: "This is 32bit... too bad..." strings := OrderedCollection new. par := NativeBoost allocate: 4 * params size. params keysAndValuesDo: [ :i :each | | str | str := each asNBExternalString. strings add: str. par nbUInt32AtOffset: (i - 1) * 4 put: str value ]. self prim_initEmbeddedRargc: params size argv: par ] ensure: [ "Free the memory we allocated" par ifNotNil: [ par free ]. strings ifNotNil: [ strings do: [ :each | each free ] ] ]

With a primitive call: Self nbCall: #(int Rf_initEmbeddedR(int argc, char *argv))

Do I still need to create my own array of strings or FFI creates it for me? How?

Thanks in advance for your answers,

Vincent

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