FFI newby question: importing C functions
- From: QuentinC <webmaster@xxxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Mon, 25 Jun 2012 22:21:53 +0200
Hello listers,
I'm new in lua and luajit. I have developped a simple text editor that
uses luajit to extend its features with scripting.
I have already successfully loaded DLLs and import function from them
using FFI. However, I have a problem to import standard and de-facto
available functions (for those you don't need to load any supplementary
DLL).
I'm running luajit 2.0.0.10 compiled with MinGW 3.4.5 on windows 7 32 bits.
This code works nicely and I can see my beautiful message box appear :
ffi.cdef[[ int MessageBoxA (const void*, const char*, const char*, int) ; ]]
ffi.C.MessageBoxA(nil, "Hello world !", "Test", 48)
Infortunately, I need the standard round function missing from math
table (I don't understand why they could have missed it in lua 5.1.4 but
that's another topic). So I wrote that, but it doesn't work :
ffi.cdef[[ double round (double); ]]
function math.round (n)
return ffi.C.round(n)
end
When I call this math.round function above, I get an error telling that
the function can't be resolved.
I have also tried to run this code directly in the interactive
interpreter (luajit.exe), but the result is the same, so the problem
don't appear to come from my host program.
IN luajit 2.0.0.9, the error message was different: it said something
like "can't resolve, but operation has succeeded".
What's the problem ? What am I doing wrong ? What should I change to get
it working ?
Thank you very much for your help.
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