hdc (HDC) - input

Device context handle.

hrgn (HRGN) - input

Region handle.

prclBoundRect (PRECTL) - input

Pointer to bounding rectangle.

RECTL structure:

xLeft

Minimum x-coordinate of window
yBottom
Minimum y-coordinate
xRight
Maximum x-coordinate of window
yTop
Maximum y-coordinate
Only rectangles intersecting this bounding rectangle are returned. If this pointer is NULL, all rectangles in the region are enumerated. If this pointer is not NULL, only rectangles that intersect the bounding rectangle are returned. Each of these rectangles is the intersection of the bounding rectangle with a rectangle in the region.

pControl (PRGNRECT) - input

This is a pointer to a RGNRECT structure:

lrcStart

The rectangle number to start enumerating (1 indicates start at the beginning).

If parclRect is NULL, this field is always 1.

crc
The number of rectangles that can fit into the buffer (at least 1).

If parclRect is NULL and the clip region is completely within prclBoundRect, crc contains the value RRGN_INSIDE.

If parclRect is NULL and the clip region is completely outside prclBoundRect, crc contains the value RRGN_OUTSIDE.

If parclRect is NULL and the clip region spans prclBoundRect, crc contains the value RRGN_PARTIAL.

crcReturned
Number of rectangles that were written into the buffer. If less than lrcStart, there are no more rectangles to enumerate.

If parclRect is NULL and the clip region is completely within prclBoundRect, crcReturned contains the value 1.

If parclRect is NULL and the clip region is completely outside prclBoundRect, crcReturned contains the value 0.

If parclRect is NULL and the clip region spans prclBoundRect, crcReturned contains the number of clip rectangles.

usDirection
The direction in which the rectangles are listed:

RECTDIR_LFRT_TOPBOT

Left-to-right, top-to-bottom
RECTDIR_RTLF_TOPBOT
Right-to-left, top-to-bottom
RECTDIR_LFRT_BOTTOP
Left-to-right, bottom-to-top
RECTDIR_RTLF_BOTTOP
Right-to-left, bottom-to-top
If parclRect is NULL, usDirection is not applicable.

parclRect (PRECTL) - input

Pointer to array of rectangle structures that define the region.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

High-order WORD=flags; low-order WORD=NGreGetRegionRects.

rc (BOOL) - returns

Return codes.

This function returns BOOLEAN (fSuccess).

TRUE

Successful
FALSE
Error
Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:

PMERR_HRGN_BUSY PMERR_INV_COORDINATE
PMERR_INV_HRGN
PMERR_INV_RECT
PMERR_INV_REGION_CONTROL
PMERR_REGION_IS_CLIP_REGION

Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.

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