Microsoft KB Archive/255584

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INFO: PlaySound May Succeed But Not Play a Sound from a Service

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Q255584

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The information in this article applies to:


 * Microsoft Win32 Application Programming Interface (API), included with:
 * Microsoft Windows NT Server version 4.0
 * Microsoft Windows NT Workstation version 4.0

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SUMMARY
When you are using the PlaySound function from a service that is configured for the localsystem account, it may fail to play a sound although the same code works from an interactive user.

MORE INFORMATION
The PlaySound function refers to the following registry key to determine the sound card to play the sound file:

"HKEY_CURRENT_USER\SOFTWARE\Microsoft\Multimedia\Sound Mapper" The Playback value specifies the sound card.

HKEY_CURRENT_USER is a mapping of the user's profile, which is loaded under HKEY_USERS. A service that is configured for the localsystem account does not have a profile, and therefore any references to HKEY_CURRENT_USER refer to HKEY_USERS\.default. The registry settings may be different from the interactive user's profile. The Playback value should match for both registry keys.

Additional query words:

Keywords : kbOSWinNT400 kbDSupport

Issue type : kbinfo

Technology : kbAudDeveloper kbWin32sSearch kbWin32API