## Presentation Device Driver Reference for OS/2

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### GreQueryWidthTable - Parameters

hdc (HDC) - input Device context handle.

lFirstChar (LONG) - input Code point of the initial character for which width-table information is required.

cWidthTable (LONG) - input Count of widths in the width-table data.

paWidthTable (PLONG) - input Pointer to buffer of width-table data.

pInstance (PVOID) - input Pointer to instance data.

lFunction (ULONG) - input High-order WORD=flags; low-order WORD= NGreQueryWidthTable.

rc (BOOL) - returns Return Code.

On completion, the handling routine must return a BOOLEAN value to indicate success or an error.

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_COORDINATE_OVERFLOW
PMERR_DEV_FUNC_NOT_INSTALLED
PMERR_EXCEEDS_MAX_SEG_LENGTH
PMERR_HDC_BUSY
PMERR_INSUFFICIENT_MEMORY
PMERR_INV_CHAR_MODE_ATTR
PMERR_INV_CODEPAGE
PMERR_INV_COORD_SPACE
PMERR_INV_FIRST_CHAR
PMERR_INV_HDC
PMERR_INV_LENGTH_OR_COUNT
PMERR_INV_MATRIX_ELEMENT
PMERR_INV_SETID
PMERR_INV_TRANSFORM_TYPE

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