SQLGetDiagRec导致Unicode发布版本崩溃

I'm having a problem with the call to SQLGetDiagRec. It works fine in ascii mode, but in unicode it causes our app to crash, and i just can't see why. All the documentation i've been able to find seems to indicate that it should handle the ascii/unicode switch internally. The code i'm using is:I'm having a problem with the call to SQLGetDia