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  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:

IMPLEMENT_XP(XP_SAVEFILE, CSaveFileStoredProcedure)

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:

#define IMPLEMENT_VERSION_XP() \
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

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm  

 

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