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Asked: 2026-05-11T17:37:23+00:00

I found a great C++/ODBC example here … The project I downloaded builds great

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I found a great C++/ODBC example here…

The project I downloaded builds great and everything works. However, when I copy the .cpp and .h files into another project, I seem to have a linking problem.

The SQLConnect function in sql.h is the one I want. When I right-click this function in the easyodbc.h file in the project I downloaded, it jumps to the declaration in sql.h. Life is good.

However, in the project I created, when I do this it jumps to a UNICODE definition in sqlucode.h. This seems to be causing problems and my test project crashes.

I don’t have an #include for sqlucdode.h anywhere in my project, yet it still resolves the declaration to the one in sqlucode.h. How can I prevent this? Thanks.

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1 Answer

  1. Editorial Team

    Seems like you have a preprocessor problem rather than a linking problem.

    You probably have a preprocessor definition for UNICODE (or _UNICODE) in your project file. In Visual C++ 2005 and 2008 you can fix this by going to your project properties and changing Character Set from Use Unicode Character Set to Use Multi-Byte Character Set. When you apply this setting, Visual Studio fixes up the right preprocessor and linker settings for you.

    If you have an earlier version of Visual Studio you can still fix it by changing the preprocessor definitions for UNICODE and _UNICODE to _MBCS – it’s just you’ll have to find them yourself.

    EDIT: I just downloaded that example code and tried it – good news, it’s exactly as I guessed, change to a multibyte character set and you’ll be fine.

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