RAS not loading admin DLL

I have coded a RAS Admin DLL that exports only the function RasAdminGetIpAddressForUser(), but I can't seem to get RAS to start when the registry keys are added.  The registry keys are written as per instructions at http://www.microsoft.com/msdn/sdk/platforms/doc/sdk/win32/func/src/f69_19.htm, as follows:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RAS\AdminDll]
"DisplayName"="Trial IP DLL"
"DLLPath"="D:\\usermgr\\IPByPort.dll"

I've built the DLL (no errors, no warnings) using VC++5, and written a .DEF file that's included in the project as follows:

LIBRARY    IPByPort
DESCRIPTION "Assigns a fixed IP address by COM Port number"
EXPORTS
   RasAdminGetIpAddressForUser

So the question is - I'm fairly new to DLL programming, so this may well be simple - why doesn't RAS load it?  The error in the event log is event ID 20104, data 7f 00 00 00.
robinhoodAsked:
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robinhoodAuthor Commented:
Edited text of question
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y96andhaCommented:
You might need to create all functions. Try adding the rest of them as empty stubs.
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NickRepinCommented:
Make sure your callback functions entries are declared with WINAPI, CALLBACK, APIENTRY or _stdcall modifiers.

Change your code and Rassapi.h to use the following function declarations:

DWORD APIENTRY RasAdminGetIpAddressForUser(
   ....);

Or, download the latest version of rassapi.h from http://www.microsoft.com/msdn/sdk/platforms/doc/sdk/headers/_winnt/c382_19.htm.

Also, there is the sample on the microsoft's sites which demonstrates the creation of a user's dll for RAS server. But I don't remember  exactly where it resides. But I have got a copy of it and I can send you if you want.

P.S. I'm unavailable to read a mail every day this month, so it's may be a delay with my answer.

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robinhoodAuthor Commented:
I've got the new rassapi.h already (came with VC++5) - at least, it has the correct (APIENTRY) definitions for the DLL functions. I've also found *a* (if not *the*) sample on MS's site, including both .exe and .dll code for RASSAPI functions.  Needless to say, neither of them even come close to compiling, but that's okay - I've checked the general coding structure that they've used, and it all seems to be the same as what I was trying.

The comment from y96andha might be the trick I'm looking for, and is the one difference between my project and that of the MS sample (except that mine builds :) - I'll give it a go and follow up here with how it works out.
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robinhoodAuthor Commented:
The comment from y97andha is in fact the correct solution.

Sorry about the "F", Nick - ExEx haven't got their act together yet to enable the "Mark a comment as an answer...", so it wasn't that your answer was wrong, it just wasn't the solution to the problem.
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y96andhaCommented:
I think Microsoft could have done better on the error message, to show what was really wrong. I read through the docs, and noted that there was nothing about what functions had to be implemented, and then that there would be a message in the event log if any function couldn't be loaded.
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