hdc (HDC) - input

Device context handle.

prclViewport (PRECTL) - input

Pointer to page viewport boundaries.

This is a RECTL structure in device coordinates:

xLeft

Minimum x-coordinate of viewport
yBottom
Minimum y-coordinate
xRight
Maximum x-coordinate of viewport
yTop
Maximum y-coordinate
Boundaries are inclusive at the bottom-left corner, and exclusive at the top-right corner.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

fSuccess (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_HDC_BUSY PMERR_INV_HDC

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