## Presentation Device Driver Reference for OS/2

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### GreQueryTextBox - Parameters

hdc (HDC) - input Device context handle.

cChars (LONG) - input Number of bytes in string.

pchString (PCH) - input Pointer to character string.

cptPosition (LONG) - input Number of (X, Y) pairs that the Position array can contain.

paptPosition (PPOINTL) - input Pointer to position array.

Pointer to the array in which the function returns the requested values. Upon completion, the array contains cptPosition sets of (X, Y) coordinates in the following order:

TXTBOX_TOPLEFT Top-left corner
TXTBOX_BOTTOMLEFT Bottom-left corner
TXTBOX_TOPRIGHT Top-right corner
TXTBOX_BOTTOMRIGHT Bottom-right corner
TXTBOX_CONCAT Start point of next character position

pInstance (PVOID) - input Pointer to instance data.

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

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_ANGLE_ATTR
PMERR_INV_CHAR_MODE_ATTR
PMERR_INV_CODEPAGE
PMERR_INV_COORD_SPACE
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.