Call now: (800) 766-1884  


 SQL Server Tips
 SQL Server Training

 SQL Server Consulting
 SQL Server Support
 SQL Server Remote DBA

 SQL Server Scripts
 Scripts Menu




  SQL Server Tips by Gama and Naughter

Exporting the function

To hide all of the details required to export the XP function from the DLL, quite a lot of things need to be correct. In C++, you need to ensure that your function uses ‘extern "C"’ to avoid name mangling. You also need to use the Microsoft Visual C++ extension ‘__declspec(dllexport)’ to export the function or if this is not available, then falling back to using a DEF file. To hide all of these details, a pre-processor macro ‘IMPLEMENT_XP’ is provided. For example, if your XP takes the following form in SDK style code:

extern "C" SRVRETCODE __declspec(dllexport) XP_SAVEFILE(SRV_PROC *srvproc)
-------YOUR XP CODE-----

Then this would map to the following using the XP++ framework:


XP_SAVEFILE will be the name of the exported function and CSaveFileStoredProcedure will be the class you develop which is derived from CExtendedStoredProcedure (described later).

Support for __GetXpVersion

Support for this function is provided through the pre-processor macro ‘IMPLEMENT_VERSION_XP()’. This simply adds the standard boilerplate code for the __GetXpVersion function to your project. IMPLEMENT_VERSION_XP is implemented as:

extern "C" __declspec(dllexport) ULONG __GetXpVersion() \
{ \
return ODS_VERSION; \

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter  


Burleson Consulting Remote DB Administration







Burleson is the America's Team

Note: The pages on this site were created as a support and training reference for use by our staff of DBA consultants.  If you find it confusing, please exit this page.

Errata?  SQL Server technology is changing and we strive to update our SQL Server support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:and include the URL for the page.

Burleson Consulting
SQL Server database support


Copyright © 1996 -  2013 by Vaaltech Web Services. All rights reserved.

Hit Counter