waveOutGetDevCaps
A version of this page is also available for
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 WAVEOUTCAPS structure to be filled with information about the capabilities of the device.
- cbwoc
Size, in bytes, of the WAVEOUTCAPS structure.
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 |
uDeviceID is invalid. |
MMSYSERR_NOMEM |
Unable to allocate or lock memory. |
Remarks
Use the waveOutGetNumDevs function to determine the number of waveform-audio output devices present in the system. If the value specified by the uDeviceID parameter 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 cbwoc bytes (or less) of information is copied to the location pointed to by pwoc. If cbwoc is 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 waveOutOpen and 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 |