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  SQL Server Tips by Gama and Naughter


This final XP in XP_NOTIFY plays a wave file directly from a parameter representation of a wave file. This parameter can be a “varbinary” or “image” data type. Using the “SND_MEMORY” flag when calling the “PlaySound” function specifies this in-memory representation. An interesting quirk to testing this XP is that due to the inability to declare “image” data type variables in TSQL, we cannot use TSQL and Query Analyzer directly to fully test this XP. TSQL does provide a TEXTPTR data type, which allows you to read “image” data a chunk at a time, but to play a sound from memory; PlaySound requires a wave file to be represented as a continuous chunk of memory. If you do want to test this function from TSQL then you must limit the wave file size to less than 8000 bytes. This in memory representation also means that this XP is limited to wave files which can be fully loaded into memory. This is not too big a limitation in this case, but if you are developing a fully fledged audio management application which needs to handle arbitrary sized wave files, then you will need to use the lower level Waveform functions in the Windows SDK such as “waveOutWrite” or the DirectX Audio APIs.

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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