[cinvoke-dev] Problem using tables in Lua callback

[Bradley Smith]

On Windows, when I try to use table.insert in a Lua callback, C/Invoke 
crashes. Below is an example which is a variation on an example in the 
C/Invoke Lua documentation. What is going wrong?

Thanks,
 Bradley


----- myfunc.c -----
// Compiled with Visual Studio 2005 command: cl /LD myfunc.c
#ifdef _WIN32
__declspec(dllexport) void myfunc(void (*cb)(int), int);
#endif


void myfunc(void (*cb)(int), int i) {
   cb(i);
}


----- useMyfunc.lua -----
require("cinvoke_lua")

mylib = clibrary.new("myfunc.dll")

function lua_cb(i)
 if i == 3 then
   t = {}
   t.value = i
   print("value " .. t.value)
 elseif i == 4 then
   t = {}
   print("crashes at next line")
   table.insert(t, i)
   print("value[1] = " .. t[1])
 else
     print(i)
   end
end

myfunc = mylib:get_function(Cvoid, "myfunc", Ccallback, Cint);
cbobj = mylib:new_callback(Cvoid, lua_cb, Cint);

myfunc(cbobj, 1) -- prints "1"
myfunc(cbobj, 2) -- prints "2"
myfunc(cbobj, 3) -- prints "3"
myfunc(cbobj, 4) -- crashes