From: Brian Takita <brian.takita@...>
Date: 2005-04-26T04:59:33+09:00
Subject: Re: Get the Current Domain Name in Windows

Thank you for your response Ryan.

This did get me moving forward. I looked at some VB samples in using
the WKSTA_USER_INFO_1 structure and it looks like four of the
parameters are long data types.

http://vbnet.mvps.org/index.html?code/network/netwkstagetinfouserinfo.htm

It seems like they are pointers to the strings. The example uses a
RtlMoveMemory and then extracts the string from the pointer.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/memory/base/movememory.asp

I tried this but still can't get this to work. I can use Dan's solution
to my problem, but would be nice to know how to work with the Windows
API.

Here is my code:
require 'dl/win32'

getUserNameInfo = Win32API.new('Netapi32.dll', 'NetWkstaUserGetInfo',
%w{p l P}, 'i')
bufferFree = Win32API.new('Netapi32.dll', 'NetApiBufferFree', 'p', 'l')
memoryCopy = Win32API.new('kernel32.dll', 'RtlMoveMemory', 'ppl', '')

reserved = 0
buf = ' ' * 4 * 4

begin
	returnCode = getUserNameInfo.call(reserved, 1, buf)
	username_loc, logon_domain_loc, oth_domains_loc, logon_server_loc =
buf.unpack('llll')
	puts 'username: ' + username_loc.to_s
	puts 'logon_domain: ' + logon_domain_loc.to_s
	puts 'oth_domains: ' + oth_domains_loc.to_s
	puts 'logon_server: ' + logon_server_loc.to_s
	puts returnCode

	username = 0
	memoryCopy.call(username, username_loc, 255)
	result = username.unpack('a')
	puts result.to_s
ensure
	bufferFree.call(buf)
	bufferFree.call(username)
end

I am getting the following output:
username: 287528
logon_domain: 538976288
oth_domains: 538976288
logon_server: 538976288
0
c:/program files/ruby/lib/ruby/1.8/dl/win32.rb:20:in `call': 2
arguments are needed (ArgumentError)
        from c:/program files/ruby/lib/ruby/1.8/dl/win32.rb:20:in
`call'
        from test.rb:20

It's strange that I get this error, because the RtlMoveMemory function
calls for three argements.