HI,

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On 21 Sep 2019, at 13:18, eftomi <tomaz.turk@ef.uni-lj.si> wrote:

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HI,

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I have a couple of questions regarding FFI:

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- If you want to create a new FFIExternalType subclass, which are the

necessary hooks that should be implemented - like #externalType,

#externalTypeSize ��� on the class side and #basicHandle:at:,

#basicHandle:at:put:, #stackValueParameterClass, etc. on the instance side?

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Yes, but in general you do not need to implement your type, you can derive what you need from the ones existing.

Why you need to do it?

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- Is there anything else that should be done besides hooks - for instance

another "entries" into FFIConstants class>>#initializeTypeConstants or even

ExternalType>>#initializeAtomicTypes ?

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No.

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- About naming standards: the ExternalData class has some methods that

"grab" strings from the heap, like ExternalData>>#fromCString and

ExternalData>>#readStringUTF8 - these two methods do the heavy work, however

the method ExternalData>>#readString more or less just refers to

ExternalData>>#fromCString. Is there any difference between "from..." and

"read���"?

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At the begining, there was fromCString.

Then someone else added readStringUTF8.

Then I added readString because I like coherence :)

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So readStrring is equivalent to fromCString, but I can imagine a better future where we have just one and it will be readString :P

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Esteban

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Thanks!

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Best wishes,

Tomaz

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