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  SQL Server Tips by Gama and Naughter

Implementation Details

To use the DLL from the C++ code in the XP_SMTPSENDMAIL dll, we use the ‘#import’ support of Microsoft Visual C++. Because CDO itself uses ADO we also need to ‘#import’ ADO. The code from the pre compiled header ‘stdafx.h’ in the XP_SMTPSENDMAIL code is as follows:

#pragma warning(disable : 4146)
#import "c:\program files\common files\system\ado\msado15.dll" no_namespace rename("EOF", "adoEOF")
#pragma warning(default: 4146)
#import <cdosys.dll>

The #pragma warning disables some level 4 warnings which get generated when you import ADO. Also as is documented in the MSDN, EOF is renamed to adoEOF. This is to avoid a conflict between the ADO property ‘EOF’ and the C/C++ constant of the same name.

To create the message and set it’s ‘To’ property, you would then use the following code (which does not include error checking for reasons of brevity):

CDO::IMessagePtr msg;
msg->To = _bstr_t(“”);

To reduce the amount of boilerplate code, as well as all the other advantages already mentioned, the XP++ class framework developed in a previous chapter is used. This simplifies the validation and setup of many required and optional parameters, which this XP will require.

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  


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