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4/8/2010

This function queries a specified waveform device to determine its capabilities.

Syntax 

MMRESULT waveOutGetDevCaps(
  UINT 
uDeviceID, 
  LPWAVEOUTCAPS 
pwoc, 
  UINT 
cbwoc 
);

Parameters

uDeviceID

Identifier of the waveform-audio output device. It can be either a device identifier or a Handle to an open waveform-audio output device.

pwoc

Pointer to a WAVEOUTCAPSstructure to be filled with information about the capabilities of the device.

cbwoc

Size, in bytes, of the WAVEOUTCAPSstructure.

Return Value

One of the values described in the following table is returned.

Value Description

MMSYSERR_NOERROR

Success.

MMSYSERR_INVALHANDLE

Specified device handle is invalid.

MMSYSERR_NODRIVER

No device driver is present.

MMSYSERR_BADDEVICEID

uDeviceIDis invalid.

MMSYSERR_NOMEM

Unable to allocate or lock memory.

Remarks

Use the waveOutGetNumDevsfunction to determine the number of waveform-audio output devices present in the system. If the value specified by the uDeviceIDparameter is a device identifier, it can vary from zero to one less than the number of devices present. The WAVE_MAPPER constant can also be used as a device identifier. Only cbwocbytes (or less) of information is copied to the location pointed to by pwoc. If cbwocis zero, nothing is copied and the function returns zero.

You can determine which of the standard audio formats a driver supports by examining the contents of WAVEOUTCAPS.dwFormats. To determine whether a driver supports a particular format that is not explicitly described by the WAVEOUTCAPS, call waveOutOpenand specify the audio format and the WAVE_FORMAT_QUERY flag. If the device does not support the format, it will return WAVERR_BADFORMAT.

Requirements

Header mmsystem.h
Library coredll.lib
Windows Embedded CE Windows CE 2.0 and later
Windows Mobile Windows Mobile Version 5.0 and later

See Also