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error C2065: 'ulong ' : undeclared identifier during build

error C2065: 'ulong ' : undeclared identifier during build

2006-12-28       - By Ian Miller

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I rediscovered a problem when building mysql++ from source using Visual C++
2005 express on Windows XP. The original problem is described here:

http://www.dbtalk.net/mailing-database-mysql-plusplus/error-c2065-ulong
-undeclared-identifier-350240 (See http://ier-350240.ora-code.com).html

My coding skills are modest at best, but I think I might have a contribution to
the issue. It appears to arise from a "ulong" variable type being declared in
mysql_com.h , and can be resolved by using a comparable data type recognized by
the MS compiler.

To convince yourself of this, right-click on CLIENT_MULTI_STATEMENTS in
connection.cpp and select "Go To Definition". It will take you to the place
where the constant is declared as (((ulong) 1) << 16)

I searched for the MS-centric equivalent, and ended up finding this page:
http://www.codeproject.com/dotnet/Win32APICPlusPlustoDotNET.asp
that seemed to suggest that DWORDLONG might be better tolerated. When I tried
to build the code again it compiled.

Bottom line: you can work around this problem easily by changing the two
declarations of constants with "ulong" in mysql_com.h to use "DWORDLONG"
instead. Can anyone with more expertise could confirm the equivalence of the
two variable types?

Anybody with an account on dbtalk.net willing to paste this tip into the
original thread? Just make sure not to include my email address.

Thanks,
Ian