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  SQL Server Tips by Burleson

Unicode Compilation

It is possible to work with Unicode without using a Unicode compilation, all it takes is to use variable types like “wchar_t” and call the appropriate Win32 Unicode functions making sure all the parameters are Unicode.

There are three situations when a Unicode compilation is most common:

1. To have two versions of one application, one for ASCII I/O and the other one for Unicode. This is possible because of the TCHAR data type, which compiles as char or wchar_t depending on the _UNICODE define.
2. To use functions from the Windows SDK that work exclusively with Unicode. For example, The Net Send and LAN Manager APIs whose parameters are LPWSTR. These APIs are the exception as most of the Win32 API has both ASCII and Unicode versions e.g. CreateFileA and CreateFileW.
3. When working with COM all functions expect Unicode strings.

It is also possible to convert back and forth between ASCII and Unicode but there will be data corruption if Unicode characters cannot be mapped to ASCII.

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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