IOCTL_VIDEO_SAVE_HARDWARE_STATE - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ntddvdeo.h

// CTL_CODE(0x0023, 0x080, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VIDEO_SAVE_HARDWARE_STATE 0x00230200
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ni-ntddvdeo-ioctl_video_save_hardware_state)

IOCTL_VIDEO_SAVE_HARDWARE_STATE IOCTL

Description

Saves the state of the video adapter in the VRP OutputBuffer. Miniport drivers for VGA-compatible adapters are required to support this nonmodal request; optional for other miniport drivers.

Parameters

Major code

Input buffer

None

Input buffer length

Output buffer

The miniport driver returns a VIDEO_HARDWARE_STATE structure in the VRP OutputBuffer.

Output buffer length

Input/output buffer

Input/output buffer length

Status block

If the miniport driver successfully saves the adapter state, it sets the Information member of the STATUS_BLOCK structure to sizeof(VIDEO_HARDWARE_STATE); otherwise, the miniport driver sets this member to zero.

See also

STATUS_BLOCK

View the official Windows Driver Kit DDI reference

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