windows dll share data , using pelles C 7.0R

/*
   dll file must using same folder's dll,
   X:/xx/xxx/my_dll.dll
   O:/ooo/oo/my_dll.dll
 my_dll.dll  =content=  mydll.dll
but loading to memory , it's two different dll.
*/
 
/* below is dll key function and compiler option */
/*
compiler option :  Enable microsoft extension ,   calling conv: __cdecl

*/

#pragma data_seg(".shared")
    int share_var_k = 0;
#pragma data_seg()
#pragma comment(linker, "/section:.shared,RWS")


DLLAPI int WINAPI get_share_var(void)
{   
     return share_var_k;
}

DLLAPI void WINAPI set_share_var(int value)
{   
     share_var_k = value;
}





/* ---- cut ---- */





/* -------------- below is test file function ------*/

int main(int argc, char *argv[])
{
    printf("Hello, world!\n");
    for(int i=0;i<25 br="" i="">    {
        int value=0;
        set_share_var(i);
        Sleep(1000);
        value = get_share_var();
        printf("%d\r\n",value);
    }
    return 0;

lcc-win32 build openeuolua

build a openeuolua.dll for

work for LFW LuaForWindows_v5.1.4-46.exe (from goggle code)

in OpenEUOLua.zip   OpenEUOLua.txt copy rename to -->  openeuolua.c

; make an lib for lcc-win32 usage
copy X:\lua\5.1\lib\lua51.lib
pedump /EXP lua51.lib > 51.exp
buildlib 51.exp lua51_lcc.lib
 
makefile
[code]
SRCDIR=e:\lcc\p\openeuolua
CFLAGS=-I"E:\lcc\p\OpenEUOLua\lua51\include" -I"e:\lcc\include" -DWIN32 -DLUA_BUILD_AS_DLL
CC=$(LCCROOT)\bin\lcc.exe
LINKER=$(LCCROOT)\bin\lcclnk.exe
OBJS=\
    openeuolua.obj

LIBS=e:\lcc\p\openeuolua\lua51_lcc.lib
EXE=e:\lua\5.1\clibs\openeuolua.dll

$(EXE):    $(OBJS) Makefile
    $(LINKER)  -s -dll -entry DllMain -nounderscores -o e:\lua\5.1\clibs\openeuolua.dll $(OBJS) $(LIBS)

# Build openeuolua.c
OPENEUOLUA_C=\
    $(SRCDIR)\lua51\include\lauxlib.h\
    $(SRCDIR)\lua51\include\lua.h\
    $(SRCDIR)\lua51\include\luaconf.h\

openeuolua.obj: $(OPENEUOLUA_C) $(SRCDIR)\openeuolua.c
    $(CC) -c $(CFLAGS) $(SRCDIR)\openeuolua.c

link:
    $(LINKER)  -s -dll -entry DllMain -nounderscores -o e:\lua\5.1\clibs\openeuolua.dll $(OBJS) $(LIBS)

clean:
    del $(OBJS) openeuolua.dll
[/code]

build lua dll module in mingw/msys

1. install mingw/msys , base_mingw,base_msys,g++
2. postinstall msys

3. download & build lua 5.1.5
    make mingw
4. write a dll4lua.c   
    gcc  -O2  -c  -o dll4lua.o  dll4lua.c
    gcc  -O    -shared -o dll4lua.dll  dll4lua.o -llua

xpsp3 install mingw using mingw-get-setup , after download ok , need run postinstall script/batch file

as title say:
   When online install msys + mingw , using  mingw-get-setup
after install ok , need to run postinstall script, otherwise
msys.bat environment don't recongnize your mingw tool-chain.

LUA read only table

-----------------------------------------------
-- file DIR.lua

function readOnly (table)
  local proxy = {}
  local mt = {       -- create metatable
    __index = table
    ,__newindex = function (x,k,v)
      error("read-only "..k, 2)
    end
    ,__metatable = false
  }
  setmetatable(proxy, mt)
  return proxy
end

local t = { LEFT = 7, RIGHT = 8 }
DIR = readOnly(t)

---------------------------------------------
-- file test.lua
dofile("DIR.lua")

print("t="..tostring(t))

print("LEFT="..DIR.LEFT)
-- DIR.LEFT = 9                -- : read-only LEFT
print("LEFT="..DIR.LEFT)

mt = getmetatable(DIR)
print("mt="..tostring(mt))

---------------------------------------------
-- output
t=nil
LEFT=7
LEFT=7
mt=false

LUA Point class example 2

--
-- refine Point class for LUA
--
function class()
  local cls = {}
  cls.__index = cls
  return setmetatable(cls,
    { __call = function (c, ...)
       instance = setmetatable({}, cls)
       if cls.__init then
          cls.__init(instance, ...)
       end
       return instance
      end
    }
  )
end

Point = class()
Point.key_list = {"x","y","z"}

function Point.__index(t,key)
  error("No such Point member or init:"..key ,2)
end

function Point.__newindex(t,key,value)
  for i = 1,#Point.key_list do
    if key == Point.key_list[i] then
       -- t[key] = value
       rawset(t,key,value)
       return
    end 
  end
  error("No such Point member :"..key ,2)
end

function Point:__init(...)
 args = { ... }
 if #args == 3 then
   self.x = args[1]
   self.y = args[2]
   self.z = args[3]
 elseif #args == 2 then
   self.x = args[1]
   self.y = args[2]
 else
    error("2D or 3D only" ,2)  
 end
end

function Point:__tostring()
  local out = ""..self.x..","..self.y
 
  local zz = rawget(self,"z")      
  if zz ~= nil then
     out=out..","..self.z
  end
  return out 
end

--
-- Usage
--

p1 = Point(1,2)
p2 = Point(3,4)

p1.x = 8

x1,y1=p1.x,p1.y
print(string.format("x1,y1=%d,%d",x1,y1))

-- p2 = p1

print(string.format("x2,y2=%d,%d",p2.x,p2.y))
--
local points = {p1,p2}
print("points[1].x=" .. points[1].x)
print("points[2].y=" .. points[2].y)


print("p1="..tostring(p1))
--print("p1="..p1)

p3 = Point(4,5,6)
print("p3="..tostring(p3))

--[[ below is two  error test
print("p1.z="..p1.z)  -- : No such Point member or init:z
p1.xxx = 567          -- : No such Point member :xxx
-- ]]

--
--[[ output
--
x1,y1=8,2
x2,y2=3,4
points[1].x=8
points[2].y=4
p1=8,2
p3=4,5,6
: No such Point member or init:z
: No such Point member :xxx
-- ]]

lua 2d/3d point class

--
-- define Point class for LUA
--
Point = {}
Point.key_list = {"x","y","z"}

function Point.__index(t,key)
  error("No such Point member or init:"..key ,2)
end

function Point.__newindex(t,key,value)
  for i = 1,#Point.key_list do
    if key == Point.key_list[i] then
       -- t[key] = value
       rawset(t,key,value)
       return
    end 
  end
  error("No such Point member :"..key ,2)
end

function Point.new(...)
 local pt = {}
 args = { ... }
 if #args == 3 then
   pt.x = args[1]
   pt.y = args[2]
   pt.z = args[3]
 elseif #args == 2 then
   pt.x = args[1]
   pt.y = args[2]
 else
    error("2D or 3D only" ,2)  
 end
 setmetatable(pt,Point)
 return pt
end

--
-- Usage
--

p1 = Point.new(1,2)
p2 = Point.new(3,4)

p1.x = 8

x1,y1=p1.x,p1.y
print(string.format("x1,y1=%d,%d",x1,y1))

-- p2 = p1

print(string.format("x2,y2=%d,%d",p2.x,p2.y))
--
local points = {p1,p2}
print("points[1].x=" .. points[1].x)
print("points[2].y=" .. points[2].y)

-- [[ below is two  error test
print("p1.z="..p1.z)  -- : No such Point member or init:z
p1.xxx = 567          -- : No such Point member :xxx
-- ]]

--
--[[ output
--
x1,y1=8,2
x2,y2=3,4
points[1].x=8
points[2].y=4
: No such Point member or init:z
: No such Point member :xxx
-- ]]