hdc (HDC) - input

Device context handle.

lCode (LONG) - input

DEVESC_GETAPERTURE escape code.

lInCount (LONG) - input

The handling routine should ignore this parameter.

pbInData (PBYTE) - input

The handling routine should ignore this parameter.

plOutCount (PLONG) - input

Number of bytes pointed to by pOutData.

pbOutData (PLONG) - input

Pointer to an APERTURE structure containing:

ulPhysAddr

The physical address of the video memory aperture that the calling routine should use.
ulApertureSize
The size in bytes of the video memory aperture.
ulScanLineSize
The offset in VRAM between scan lines.

This value tells the caller how many bytes of VRAM (not visible memory) are used for each scan line. For example, an 800-byte visible scan line could be mapped onto a 1024-byte physical scan line.

rctlScreen
A rectangle describing the visible region of VRAM.

For example, a 640 x 480 screen would normally return an upper-left corner of (0,0) and a lower-right corner of (639,479).

rc (LONG) - returns

Return Code.

The handling routine returns:

DEV_OK

Successful
DEVESC_NOTIMPLEMENTED
Escape is not implemented for the specified code
DEVESC_ERROR
Error

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