Re: Lua calling C question
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- Subject: Re: Lua calling C question
- From: Asko Kauppi <asko.kauppi@...>
- Date: 2005年4月30日 20:29:32 +0300
If you mean allocating a buffer where the data is read (by C) and using
it then in Lua, why not simply give a proper userdata block length (you
can use a structure with 'data[0]' as a "growing tail" in most
compilers). Then, you'd attack __index metamethod to the userdata so
it seems like a usual Lua (read-only) table to Lua scripts. Would this
be enough?
Other alternative (since it's char*) would be pushing a specific length
string, but this might need an interim buffer malloced/freed by you
(since Lua strings are read-only).
Did I even touch close? :)
btw, Why is the iMaxSize a reference (you're using C++ here, right?).
That is, is the 'Read' function actually setting/writing it, is it
input only, or mixed input-output. Please specify.
-ak
30.4.2005 kello 13:26, Robert Aronsson kirjoitti:
Hi guys,
Excuse me if this has been posted before but I cant find it in the
archives.
I need to call a c function from lua that looks like this
bool Read(char *pData,unsigned int &iMaxSize);
The Read function will read some data of max iMaxSize and place it in
the pre-allocated pData char pointer, returns true on success or false
on failure.
My question is, how do I pre-allocate an array in Lua that I can use
to send into this C function? (without doing a for loop that adds
strings to a variable for example)
Best Regards,
Robert Aronsson