Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 94)

6–40 Library of Routines OC_GetSwitchPosition

Publication 1747-6.5.3 June 1998

OC_GetSwitchPosition OC_GetSwitchPosition reads the current position of the three-position front-panel

switch from the scanner.

Syntax:

int OC_GetSwitchPosition(HANDLE handle, BYTE *swpos);

Parameters:

Description:

The switch position has no effect on the scanner. The application can use this switch for any purpose.

The scanner must be initialized before you can monitor the switch position.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

BYTE sw_pos;

int retcode;

retcode = OC_GetSwitchPosition( Handle, &sw_pos );

if ( sw_pos == SWITCH_BOTTOM )

OC_SetScanMode ( Handle, SCAN_IDLE );

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

swpos

If swpos is:

SWITCH_TOP switch is in the top position

SWITCH_MIDDLE switch is in the middle position

SWITCH_BOTTOM switch is in the bottom position

Name: Value: Description:

SUCCESS

switch position was read successfully

ERR_OCACCESS

handle does not have access to scanner

ERR_OCINIT

scanner has not been initialized, see OC_InitScanner

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 94