Microsoft Windows CE 3.0  


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This message requests an ACM driver to stop conversion operations for the specified stream.


Specifies a driver instance identifier. The driver returns this value in response to the ACM_Openfunction.
Handle to a driver.
Specifies this message.
Pointer to an ACMDRVSTREAMINSTANCEstructure.
Contains the fdwResetparameter of the acmStreamResetfunction.

Return Values

MMSYSERR_NOERROR indicates success. Otherwise, the driver returns one of the MMSYSERR error values declared in the Mmsystem.h header file or one of the ACMERR error values declared in the Msacm.h header file.


The ACM (Waveapi.dll) sends this message by calling the ACM driver's ACM_IOControlentry point through the DeviceIoControlfunction. The ACM sends this message when an application calls the acmStreamResetfunction.

Only asynchronous drivers receive this message. If a client calls acmStreamResetfor a synchronous driver, the ACM returns MMSYSERR_NOERROR without calling the driver.

When an asynchronous driver receives this message, it sets the ACMSTREAMHEADER_STATUSF_DONE flag and clears the ACMSTREAMHEADER_STATUSF_INQUEUE flag in every ACMDRVSTREAMHEADERstructure contained in its conversion queue.

For more information about stream conversions, see the Windows NT DDK.


Runs on Versions Defined in Include Link to
Windows CE OS 1.0 and later      
Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

 Last updated on Tuesday, July 13, 2004

© 2004 Microsoft Corporation. All rights reserved.