ID Number: Q77697
1.00
WINDOWS
Summary:
SYMPTOMS
When an application uses the sndPlaySound function to play a wave
file with both the SND_ASYNC and SND_MEMORY flags set, Microsoft
Multimedia Windows hangs.
CAUSE
The memory used to store the wave becomes invalid before the wave
file is finished playing.
RESOLUTION
Ensure that the memory used to store the wave remains valid until
the wave is complete.
More Information:
As it plays the sound, Multimedia Windows must be able to access the
memory used to store the wave file. If this memory is deleted during
playback, Windows will hang because the memory is no longer valid. The
memory can be deleted if an application starts to play a sound and
exits. All memory allocated by an application is freed upon exit.
To terminate the playback of a asynchronous wave initiated by
sndPlaySound, call the sndPlaySound function with the lpszSoundName
parameter set to NULL. This should be done only when an application is
playing an asynchronous sound from memory and it is necessary to stop
playing the sound. For example, this should be done if the application
is playing a sound from memory and the user closes the application.
Note: The memory allocated for the wave file must be shared. All
shared memory allocated in a DLL (dynamic-link library) is owned by
the DLL. Other memory allocated in a DLL is owned by the application
that calls the DLL. When the DLL is freed, all shared memory allocated
by the DLL is freed. Therefore, if the DLL that allocates the memory
to hold the wave is freed before sndPlaySound is complete, Windows
will hang.
Additional reference words: 1.00