Re: [go-nuts] How to return a Go struct to C

[Konstantin Khomoutov]

On Tue, 21 Mar 2017 11:23:39 +0300
Konstantin Khomoutov <flatw...@users.sourceforge.net> wrote:

[...]

Sorry, a couple of assorted fixes:

> A sketch would look something like this:
> 
>   /*
>     typedef MediaHandle uint64_t

Should be

  typedef uint64_t MediaHandle

of course.

>   */
>   import "C"
> 
>   import "unsafe"
> 
>   var media = map[uintptr]C.struct_Media
> 
>   //export GetMediaFromDB
>   func GetMediaFromDB(filename *C.char) unitptr {
>     c_struct_media := &C.struct_Media{}
> 
>     handle := uintptr(unsafe.Pointer(c_struct_media))
>     media[handle] = c_struct_media
>     return handle
>   }

This one is better formulated to return a value of proper type
representing the handle:

   func GetMediaFromDB(filename *C.char) C.MediaHandle {
     c_struct_media := &C.struct_Media{}
 
     handle := C.MediaHandle(uintptr(unsafe.Pointer(c_struct_media)))
     media[handle] = c_struct_media
     return handle
   }

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