On 8 November 2016 at 13:11, Esteban Lorenzano <[email protected]> wrote:
> > On 8 Nov 2016, at 12:55, Dimitris Chloupis <[email protected]> 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 <[email protected]> > wrote: > >> On 8 Nov 2016, at 12:49, Dimitris Chloupis <[email protected]> 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 <[email protected]> >> 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 <[email protected]> >> 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.
