can't connect to db with mysql++

[jia li]

I got a problem when i try to connect to mysql in mysql++ 1.7.32
I installed mysql 4.1 and got the server running as a windowsXP pro service.
I can login to mysql client as below:
mysql -u root -p

then I installed mysql++,complied the library and gave all the directories to visual studio .net.

Then I ran some examples but none worked. I made my own project and ran it. It didn't work either. An error below showed everytime:
connection failed: Access denied for user 'ODBC@'localhost'<using password: NO>

I ran the examples in dos mode with password, it showed:
connection failed: Access denied for user 'ODBC@'localhost'<using password: YES>

I am really a newbie to mysql++.
Please Please help