[gmpi] Re: NAMM follow-up, some major decisions to make

  • From: "gogins@xxxxxxxxxxxx" <gogins@xxxxxxxxxxxx>
  • To: gmpi@xxxxxxxxxxxxx
  • Date: Wed, 2 Feb 2005 10:30:22 -0500

In my view the API should be written first as a set of COM interfaces, then
these can easily be translated into object-oriented C. 

Indeed, if the API is defined as a COM coclass in Visual Studio, then the
Microsoft compiler will automatically generate C calling convention
declarations for the class. I would imagine that the generated code could
be ported to other platforms without too much trouble. The Microsoft macros
can simply be expanded into their ANSI C source and any Microsoft-specific
system calls can be removed or abstracted. 

There might be something similar in Mozilla XPCOM, which is by design
cross-platform.

Then we can have an object-oriented design that is callable from any C
calling convention binding. It would be simultaneously COM, C++, and C.

Please note, I do not recommend taking on all the baggage of COM. I want a
plain C style interface. This is just a convenient way of getting an
object-oriented one. It enables us to focus on the class design.

Original Message:
-----------------
From: Frederic Vanmol frederic@xxxxxxxxxxxxxxx
Date: Wed, 2 Feb 2005 13:03:46 +0100
To: gmpi@xxxxxxxxxxxxx
Subject: [gmpi] Re: NAMM follow-up, some major decisions to make


> Also bear in mind that, given a sufficiently clean pure-object API, it's
> relatively easy for automated tools to produce bindings and glue for
> different languages and ABIs.

Trouble is it's very easy to get cross-language compatibility wrong with an 
object API and very easy to get it right with a procedural API. 

Frederic

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