Oracle host details given a service name

Hi,
I have requirement of obtaining Oracle host details( IP, Port, SID) given a service naming (tnsname). I want to do it programmatically in VB/VC++ (Windows).
How can I do this?
One approach that I tried is reading the Oracle_Home from registry, then locating the tnsnames.ora file in the Oracle_Home, and reading the information from the file.
This works fine when user has tnsnames.ora file at the default location. But we are facing problem when user has multiple oracle homes or when the tnsnames.ora file is not at the default location.
I would like to know if there is a better approach than this to solve this problem.
Can some oracle API help in solving this problem.
Please help me in this regard as I am stuck for more than week on this problem. I did search in google but could not find anything relavant so far. So please help me.
Thanks a ton,
Subrahmanyam.

This works fine when user has tnsnames.ora file at
the default location. But we are facing problem when
user has multiple oracle homes or when the
tnsnames.ora file is not at the default location.Hi,
Set up a TNS_ADMIN environment variable that points to the directory where tnsnames.ora file is.
Into this file, you can have multiple database in different version.
Nicolas.

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caesarkim wrote:
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> Is there any way to know the host name,port number, sid and the service name
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