IOCTL_VIDEO_QUERY_NUM_AVAIL_MODES IOCTL

Returns the number of video modes supported by the adapter and the size in bytes of the video mode information, which can be used to allocate a buffer for an IOCTL_VIDEO_QUERY_AVAIL_MODES request. Miniport drivers are required to support this nonmodal request.

Major Code

IRP_MJ_DEVICE_CONTROL

Input Buffer

None

Output Buffer

The miniport driver returns the number of modes in a VIDEO_NUM_MODES structure in the VRP OutputBuffer.

Status Block

If the miniport driver successfully returns the mode count, it sets the Information member of the STATUS_BLOCK structure to sizeof(VIDEO_NUM_MODES); otherwise, the miniport driver sets this member to zero.

Requirements

   
Header ntddvdeo.h

See Also

IOCTL_VIDEO_QUERY_AVAIL_MODES

STATUS_BLOCK

VIDEO_NUM_MODES