Sent to an auxiliary audio device driver to request the capabilities of a specific auxiliary audio 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 an AUXCAPS 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 AUXCAPS 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.