Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 97)

OC_GetUserLEDState Library of Routines 6–43

Publication 1747-6.5.3 June 1998

OC_GetUserLEDState OC_GetUserLEDState reads the status of one of the four user-defined LEDs.

Syntax:

int OC_GetUserLEDState(HANDLE handle, int lednum, int *state);

Parameters:

Description:

The application can use this function to determine the current state of the LEDs.

Return Value:

Considerations:

Supported in the DOS API library and the Windows NT API library

Example:

HANDLE Handle;

int led_state;

int retcode;

retcode = OC_GetUserLEDState( Handle, 1, &led_state );

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

lednum

Must be a value from 1 to 4, which corresponds to LED 1, LED 2, LED 3,

and LED 4

state

If state is:

LED_OFF LED is off

LED_RED_SOLID LED is on, red solid

LED_GREEN_SOLID LED is on, green solid

LED_RED_FLASH LED is on, red flashing (LED1 and LED2

only)

LED_GREEN_FLASH LED is on, green flashing (LED1 and LED2

only)

Name: Value: Description:

SUCCESS

LED was read successfully

ERR_OCACCESS

handle does not have access to scanner

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 97