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Accessing COM objects from Lua

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Posted by Nick Gammon Australia (15,394 posts) bio

Date

Thu 27 Oct 2005 12:55 AM (UTC) [ quote ]

Amended on Sat 27 May 2006 09:33 PM (UTC) by Nick Gammon

Message

Although Lua is not implemented using the COM (Component Object Model) interface, sometimes it is useful to be able to use COM from within your scripts.

This is possible if you download luacom from LuaForge, and use it in your Lua scripts.

I obtained it from:



http://luaforge.net/

Specifically this section:



http://luaforge.net/projects/luacom/

For this demonstration I only needed the file luacom-1.3-bin.tgz, although the file luacom-1.3-doc.pdf is also useful, being the documentation.

I extracted the archive and got the file luacom-lua5-1.3.dll which I placed in the same directory as the MUSHclient executable.

Then, running the following invoked the Microsoft Calendar program:



-- load luacom
assert (loadlib ("luacom-lua5-1.3.dll","luacom_openlib")) ()

-- Instantiate a Microsoft(R) Calendar Object
calendar = luacom.CreateObject("MSCAL.Calendar")

-- Error check
if calendar == nil then
  error ("Error creating object")
end

-- Method call
calendar:AboutBox()

-- Property Get
current_day = calendar.Day

-- Property Put
calendar.Month = calendar.Month + 1

print(current_day)
print(calendar.Month)

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by Nick Gammon Australia (15,394 posts) bio

Date

Sat 27 May 2006 09:52 PM (UTC) [ quote ]

Amended on Sat 27 May 2006 09:53 PM (UTC) by Nick Gammon

Message

The method described above does not seem to work with recent versions of MUSHclient that use the lua50.dll, because the earlier LuaCom implementations required different DLLs.

The latest download from their site works with slightly different code. This time I will use the SAPI object to "speak" something:


assert (loadlib ("luacom.dll","luaopen_luacom")) ()

-- Instantiate a SAPI voice obejct
talk = assert (luacom.CreateObject ("SAPI.SpVoice"), "cannot open SAPI")

-- Method call
talk:Speak ("hi there")

The link I used to download the luacom.dll was:



http://luaforge.net/frs/download.php/922/luacom-1.3-luabinaries-bin.zip

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by Nick Gammon Australia (15,394 posts) bio

Date Mon 26 Mar 2007 06:41 AM (UTC) [ quote ]

Message

For more recent versions of MUSHclient (3.80 onwards) you need to use package.loadlib, like this:


assert (package.loadlib ("luacom.dll","luacom_open")) ()

Also, the version of luacom that has been compiled for Lua 5.1 is available here:

http://www.gammon.com.au/files/mushclient/lua5.1_extras/luacom.zip

See this thread for more discussion:

http://www.gammon.com.au/forum/bbshowpost.php?id=6593

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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