hdc (HDC) - input

Device context handle.

pExtent (PSIZEL) - input

Pointer to a SIZEL structure where the page dimensions are returned.

On completion, the SIZEL structure contains the actual dimensions of the page:

lWidth

Page width.
lHeight
Page height.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

rc (ULONG) - returns

Return codes.

This function returns the page units, or GPI_ERROR if an error occurred. The defined page units are described under GreSetPageUnits.

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.

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