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This message requests an ACM driver to display its Aboutdialog box.
Parameters
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. If the driver does not provide an Aboutdialog box, it returns MMSYSERR_NOTSUPPORTED.
Remarks
The ACM (Waveapi.dll) sends this message by calling the ACM driver's ACM_IOControlfunction entry point through the DeviceIoControlfunction.
If an ACM driver provides an Aboutdialog box, it displays the box in response to this message. If an ACM driver does not provide an Aboutdialog box, it returns MMSYSERR_NOTSUPPORTED. In the latter case, the ACM displays a default Aboutdialog box.
However, if lParam1is –1L, the driver does not display its Aboutdialog box. Instead, it returns MMSYSERR_NOERROR if it provides an Aboutdialog box and MMSYSERR_NOTSUPPORTED if it does not provide an Aboutdialog box.
For more information, see the Microsoft Windows NT DDK.
Requirements
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