Re: [Pharo-users] arrays with FFI structs

Sept. 9, 2016


      by the way, this is a new feature of UFFIâ¦ old NB didnât have it :)
...
On 09 Sep 2016, at 19:17, Esteban Lorenzano <estebanlm@gmail.com> wrote:
not very well (I didnât adapted the parser or optimised it, but it works fine :P). 
you need to declare a type:
CXCursor class>>initiallize
  VoidPointer3 := FFITypeArray ofType: âvoid*â.
then you declare:
CXCursor class >> fieldsDesc
    "self rebuildFieldAccessors"
    ^ #(
          int kind;
          int xdata;
          VoidPointer3 data;
    )
that should work (never tried with void*, but I do not see why wouldnât work)
cheers, 
Esteban
ps: and yes, the idea is to extend the parser for doing thisâ¦ but no time :(
...
On 09 Sep 2016, at 19:11, Ben Coman <btc@openinworld.com> wrote:
Are arrays within structs handled? I have a C type declaration...
typedef struct {
  enum CXCursorKind kind;
  int xdata;
  const void *data[3];
} CXCursor;
which for the moment I've simplified the enum and defined...
FFIExternalStructure subclass: #CXCursor
    instanceVariableNames: ''
    classVariableNames: ''
    package: 'Libclang'
CXCursor class >> fieldsDesc
    "self rebuildFieldAccessors"
    ^ #(
          int kind;
          int xdata;
          void *data[3];
    )
an evaluated...
  CXCursor rebuildFieldAccessors
but it produces...  Error: Unable to resolve external type: [
So it seems arrays inside structs are currently not handled ?
Now I read the typedef as "data is an array of three pointers to
void",  so how likely is it for something like this to work...
CXCursor class >> fieldsDesc
    "self rebuildFieldAccessors"
    ^ #(
          int kind;
          int xdata;
          void *data1;
          void *data2;
          void *data3;
    )
I'll experiment some more in the meantime.
cheers -ben