Re: Different DLL wrapping question(s)
ags wrote:
>
>
> Hi All
>
> I'm about 70% through wrapping ming.dll (the SWF output library
> ("gee I hope that hasn't been done already" :)) and am a bit stuck on what
> to do about FILE * pointers.
>
> There is only one place so far where that needs to be done
> (loadSWFFontFromFile)
> but that's a fairly important routine IMHO.
>
> So what to the rest of you dll wrapping guru's recommend? The exact C header
> is:
>
> SWFFont loadSWFFontFromFile(FILE *file);
>
> Should I allocate a chunk of memory sizeof(struct FILE) and poke the file
> number
> into it? Or would that mess with the whole purpose of the FILE struct?
>
> Should I write an fopen.dll and wrap fopen()? 
>
> BTW I hope Euphoria's open() returns the actual OS file number? In other
> functions someone kindly provided file descriptor versions as well...
>
> ags
Hi there,
If you want to duplicate the FILE* you have to have it point to a
FILE struct, which means you have to create your own struct first
and then populate it with the identical data that appears in fopen's
internal struct, but you should ask Rob how he gets the handle.
You can poke the values in yourself, but unfortunately
the last time i did this was over 5 years ago so i dont remember
the details of what you have to poke. To find out, you could always
create your own FILE pointer in C, open a file, and then print the initial
values of the struct out to a text file so you can inspect them. Once done,
you can figure out what these values are and then you'll know what to poke.
It doesnt matter which FILE struct the disk driver uses, as long
as it has the correct initial values and the driver that opened the
file is using the same kind of struct. The internal one will think
the file wasnt used so when the file is closed no problem.
An easier way is your idea to wrap fopen() in a C dll so you can
call it to get your required FILE pointer.
Sorry i cant be more help here, memory doesnt last 5 years anymore :)
Take care,
Al
And, good luck with your Euphoria programming!
My bumper sticker: "I brake for LED's"
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