WIDM_GETDEVCAPS

Sent to a waveform input device driver to request the capabilities of a specific waveform input device.

MMSYSERR_NOTENABLED The driver failed to load or initialize.

DWORD dwParam1
For Plug and Play drivers, specifies a pointer to an MDEVICECAPSEX structure. The driver fills this structure with the capabilities of the device.

For non-Plug and Play drivers, specifies a far pointer to a WAVEINCAPS data structure. The driver fills this structure with the capabilities of the device.

DWORD dwParam2
For Plug and Play drivers, specifies a device node.

For non-Plug and Play drivers, specifies the size of the WAVEINCAPS data structure in bytes.

For non-Plug and Play drivers, the driver should only write dwParam2 or less bytes to the location pointed to by dwParam1. If dwParam2 is 0, write nothing and return MMSYSERR_NOERROR.