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- Subject: Re: some lua questions
- From: Luiz Henrique de Figueiredo <lhf@...>
- Date: Mon, 19 May 2003 17:29:14 -0300 (EST)
>1. it's very clear from the documentation how to call lua from c and
>register callbacks for lua to call. but i don't see how to have lua
>load and call functions in an external shared library that isn't part of
>the host. for example, how do i call a win32 function in the msvcrt.dll
>or expat.dll? is this possible? or do i have to proxy every call
>through a callback in the host?
In Lua 5.0 use loadlib.
>2. one of my goals/requirments is that my host is a single shared
>library with no other external files or dependencies. so, if for
>example, i want to include some lua code that isn't part of lualib.lib
>how do i include it as part of my lua environment. is it best to use
>luac and embed the resulting binary code as binary data in the host then
>have lua execute it?
Yes. etc/bin2c.c can help you with this.
>3. is there a way from c to tell the difference between a lua variable
>that contains binary data from a string?
No. You may want to look at the first few bytes of the string and see if there's
anything not printable.
>4. is there a way from c to tell the difference between a lua variable
>that contains an integer from a double?
Try function isint(x) return x==floor(x) end