GreGetPageUnits

GreGetPageUnits returns the page units for the specified display context. On completion, the structure addressed by pExtent contains the dimensions of the page expressed in the units indicated by the return value of this function.

This function can be hooked by the presentation driver.


 * Simulation support: This function is simulated by a handling routine in the graphics engine.

Syntax
GreGetPageUnits(hdc, pExtent, pInstance, lFunction)

Parameters

 * hdc (HDC) - input:Device context handle.
 * pExtent (PSIZEL) - input:Pointer to a SIZEL structure where the page dimensions are returned.
 * pInstance (PVOID) - input:Pointer to instance data.
 * lFunction (ULONG) - input:High-order WORD=flags; low-order WORD=NGreGetPageUnits.

Returns

 * 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.

Sample

 * 1) define INCL_GRE_XFORMS
 * 2) include 

HDC      hdc;       /* Device context handle. */ PSIZEL   pExtent;   /* Pointer to a SIZEL structure where the page dimensions are returned. */ PVOID    pInstance; /* Pointer to instance data. */ ULONG    lFunction; /* High-order WORD=flags; low-order WORD=NGreGetPageUnits. */ ULONG    rc;        /* Return codes. */

rc = GreGetPageUnits(hdc, pExtent, pInstance, lFunction);