From: Gin Mendi <gin18em@...>
Date: 2009-07-15T15:04:32+09:00
Subject: Re: Using DLLs with my Ruby app

Thanks Ellie, I'm making a bit of progress here, this is what I did.

require 'dl'
dll = DL.dlopen("myAPI.dll")
server_logon = dll["_serverLogon@20", "0SSS00"]
result = server_logon.call("user", "pass", "address", nil, nil)

now I get "DL::DLTypeError: unknown type '0' of the return value."

I really don't have any experience with C or DLLs but I went through the 
function specs and I tried using another logon function:

Handle serverLogonEx(LPCSTR username, LPCSTR password, LPCSTR 
servername, EVENT_NOTIFY notify, LPVOID userdata)

Handle is a type definition of LPVOID, while EVENT_NOTIFY is a function 
callback. These are all a little new to me since I have no experience 
with C but just reading online and putting things together. This is now 
what I tried:

require 'dl'
dll = DL.dlopen("myAPI.dll")
server_logon = dll["_serverLogonEx@20", "PcccPP"] # still putting @20
result = server_logon.call("user", "pass", "some_address", nil, nil)

and I get the following results:
OpenPipe error 1113 - \\<some garbage characters>unknown type '0' of the 
return value.\pipe\dbserver

but I get a return from irb:
[nil, [117, 112, 49, nil, nil]]


I'm guessing the first element in that array is the returned value and 
the 2nd element which is an array was my original paramters passed? 
Perhaps I'm defining my function incorrectly?
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