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161

Readout from Key Buffer

Acquires a key code or coordinates which have been acquired from the key buffer. If the buffer

contains neither a key code nor coordinates, NO_DATA will be returned. However, coordinate

values can be returned only if the coordinates input mode is set to “enable”.

SYNTAX

int KEY_Read (unsigned int *Keycode, KDC_POSINFO *Position);

INPUT

Keycode = Pointer to the area in which the read key code is stored

Position = Pointer to the KDC_POSINFO structure in which the read coordinates

are stored

typedef struct{

int status; /*status

*0 : DOWN_STATUS

*1 : RUN_STATUS

*2 : UP_STATUS

*3 : CANSEL_STATUS

This status arises when the power is off after the down

status is acquired and before the up status is acquired.

int xpos; /* X coordinate */

int ypos; /* Y coordinate */

}KDC_POSINFO;

OUTPUT

= KDC_NONE (0) No data

= KDC_KEYCODE (1) A key code is present

= KDC_POSDATA (2) Coordinates are present

EXAMPLE

#include "padlib.h"

unsigned int Keycode;

POSITION Position;

int retcode;

retcode = KEY_Read (&Keycode,&Position);

Refer to “KEY_Scan” also.

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Casio IT-2000D Manuel d'utilisateur Page 161