Re: JaWin and retrieving data from COM objects

Hi Tate

Tate Austin wrote:
> hey, I am new to JaWin and think it looks to be very impressive, but I have
> a question.  I am attempting to pull a string out of a dll function call, my
> code invokes FuncPtr which seems to only return integers?  I assume this
> isn't a limitation of JaWin because the documentation claims it can call any
> COM functions/objects.

Just to get the terms correct (and hopefully get a bigger understanding
of what Jawin can do for you): You are not really using COM if you are
just calling a traditional function exposed in a DLL (for more info on
this see below).

A lot of changes have happened to the Jawin source and documentation in
the summer 2004. Unfortunately we haven't gotten around to releasing
this binary yet. So I will suggest you check out the newest source and
documentation from SourceForge.net and build it
yourself, as described here:
http://jawinproject.sourceforge.net/jawindeveloper.html (you don't need
to build the native C++ part).

After that you should consult the "docs/jawinuserguide_dll.html"
document for the basic terms for DLL entry points. And how to call them.

>   My code looks like:
>        FuncPtr webencrypt = new FuncPtr("MYDLLNAME.DLL",
> "FunctionThatReturnsString");
>        webencrypt.invoke(querystring, ReturnFlags.FAIL_ON_FALSE);
>
> How would I retrieve a string in JaWin, because it isn't going to happen
> through the FuncPtr class?  I need to be pulling a string out of the
> ".invoke" part of that code.
>

Could you please post the exact signature of the DLL entry point you are
trying to call. There may be a "shortcut"-invoke method for it, although
I think you are correct that you will probably have to use the "generic"
invoke, where you handle the marshalling yourself.

Best Regards
Morten