Apple does not always want developers to know what is behind a given type. For example, in the coremidi framework the following type is defined. typedef struct OpaqueMIDIClient * MIDIClientRef; How does one write a foreign interface to this type definition? Thanks Bruno
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Very interesting !!! I have applied this procedure before to framework header files but the only foreign types and function declaration that I was getting were number types. However, when I remove form a framework header file all its comments the procedure works for all its content. Has someone ever written a function to remove unnecessary content form a header file? Is there a function call in the foreign-parser package that would do the same job then using the Buffers>Evaluate menu with all the comments removed? Thanks Bruno On Jun 17, 2005, at 10:33, Martin Simmons wrote: >>>>>> On Fri, 17 Jun 2005 07:31:38 -0400, "Emond, Bruno" >>>>>> <bruno.emond@nrc-cnrc.gc.ca> said: >>>>>> >>>>>> > > Bruce> Apple does not always want developers to know what is > behind a given > Bruce> type. > Bruce> For example, in the coremidi framework the following type > is defined. > > Bruce> typedef struct OpaqueMIDIClient * MIDIClientRef; > > Bruce> How does one write a foreign interface to this type > definition? > > You define a "forward reference" type for OpaqueMIDIClient. > > If you place the above decl in a buffer with a .h extension and > then do > Evaluate Buffer in the Editor, LispWorks will generate something > like this: > > (fli:define-c-struct (opaquemidiclient > (:foreign-name "OpaqueMIDIClient") > (:forward-reference t))) > (fli:define-c-typedef (midiclientref (:foreign-name "MIDIClientRef")) > (:pointer (:struct opaquemidiclient))) > > I will get the documented for fli:define-c-struct updated to > mention this. > > -- > Martin Simmons Email: > martin@lispworks.com > LispWorks Ltd, St John's Innovation Centre TEL: +44 1223 421860 > Cowley Road, Cambridge CB4 0WS, England. FAX: +44 870 2206189 > >