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Windows 7 fixes the PlaySound(XXX, SND_MEMORY|SND_ASYNC) anti-pattern

Windows 7 fixes the PlaySound(XXX, SND_MEMORY|SND_ASYNC) anti-pattern

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A number of times in the past, I’ve mentioned that the PlaySound(xxx, xxx, SND_MEMORY|SND_ASYNC) pattern is almost always a bad idea.  After the last wave of crash dumps were received for this problem, our team decided to do something about it.  Starting with Windows 7, if you call PlaySound with SND_MEMORY|SND_ASYNC, instead of relying on the memory passed in by the application, we allocate our own buffer for the sound file on the heap and copy the file into that buffer.  We’ll only do it for WAV files that are smaller than 2M in size, and if the allocation of the buffer fails, we fall back on the original code path, but it should dramatically reduce the number of apps that crash while using this pattern.

It’s a little thing, but it should make life much easier for those applications.