hdc (HDC) - input

Any valid device context.

hsca (HSCA) - input

Handle of the SCA to be queried.

To be valid, the handle must be obtained from a previous call to GreOpenScreenChangeArea.

phrgn (PHRGN) - input

Pointer to a region handle.

pdcArg (PDC) - input

Pointer to instance data.

FunN (ULONG) - input

High-order word=Flags; Low-order word=NGreGetScreenArea.

rc (LONG) - returns

This function returns one of the following:

TRUE

If the handle passed is recognized and no errors occurred.
FALSE
All other cases.
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_INV_HDC PMERR_NO_HANDLE

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