As a said that expression does not exist The one with size it does exist and creates an instance as you would expect.
No idea what an anonymous class is. I have experienced some slow downs because creating FFI types seems that copies the data and Pharo chokes with my 3000 bytes char array. So I decided not to use FFI types and instead fetch the data directly from shared memory via the pointer which means anExternalData getHandle unsignedCharAt: for reading anExternalData getHandle unsignedCharAt: put: for writing Plus copying the data to Pharo memory kinda defeats the purpose of using shared memory in the first place and it's unnecessary . But then I am a special case ... the recommended way remains using those types. On Wed, 9 Nov 2016 at 03:34, Igor Stasenko <siguc...@gmail.com> wrote: > On 8 November 2016 at 13:11, Esteban Lorenzano <esteba...@gmail.com> > wrote: > > > On 8 Nov 2016, at 12:55, Dimitris Chloupis <kilon.al...@gmail.com> wrote: > > Thank you Esteban > > By the way I really love the design of UFFI , very clean and quite easy to > understand , great work to you and Igor :) > > > UFFI is just mine ;) > (but I sanded in giant shoulders as I took Igor work as inspiration… and > to “borrow” many cool ideas) > > Your credit is too generous :) > Btw, is this expression: > > FFITypeArray ofType: #char. > > creates anonymous class, or you making an instance of something? > > Because if it anonymous class, i was always warned against use it in such > form, and instead use some kind of class initializers to > generate all the 'types' you will use in future i.e. > > MyCalss class>>initialize > MyCharr100Type := FFITypeArray ofType: #char size:100. > > and then just use it wherever you need i.e.: > > mychars := MyChar100Type new. > > .. whatever. > > > Esteban > > > On Tue, Nov 8, 2016 at 1:54 PM Esteban Lorenzano <esteba...@gmail.com> > wrote: > > On 8 Nov 2016, at 12:49, Dimitris Chloupis <kilon.al...@gmail.com> wrote: > > I was reaching a similar conclusion > > Currently I have a void pointer to the struct with the members I mentioned > > I can get char[100] > > pointerToStruct fromCString > > and I can get the int with > > pointerToStruct getHandle integerAt: 101 size:4 signed: false > > so if I want to pass the address of the pointer to my YourStruct instance > will I have to initialize with > > YourStruct fromHandler: (pointerToStruct getHandle) > > is this a correct and safe way to pass the address ? > > > yes. > > Esteban > > > > On Tue, Nov 8, 2016 at 1:21 PM Esteban Lorenzano <esteba...@gmail.com> > wrote: > > it never could. > you need to do a “special type”, who has to be something like: > > YourStruct class>>initialize > Char100 := FFITypeArray ofType: #char. > > fieldsDesc > ^ #( > Char100 data; > int count; > ) > > but then… you want to optimise that and in field accessors, who will look > something like this: > > YourStruct >>data > "This method was automatically generated" > ^(FFITypeArray ofType: #char size: 100) fromHandle: (handle > copyFrom: 1 to: 100) > > you can change that for: > > YourStruct >>data > "This method was automatically generated" > ^Char100 fromHandle: (handle copyFrom: 1 to: 100) > > and same for setter. > (other way will work, but it will be suboptimal) > > Esteban > > > On 8 Nov 2016, at 12:10, Dimitris Chloupis <kilon.al...@gmail.com> > wrote: > > > > I have FFIExternalStructure which has at class side > > > > fieldsDesc > > ^#( > > char data[100]; > > int count; > > ) > > > > if I try to do > > > > EphCPPTestStructure rebuildFieldAccessors . > > > > in order to generate the accessors for the members of the struct it > complains with an error that it does not recognise the type of " [ " > > > > Does that mean that char arrays are other arrays are not supported as > struct members or will I have to do this manually ? > > > > > > > -- > Best regards, > Igor Stasenko. >
