Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 64)

6–10 Library of Routines OC_DemandOutputScan

Publication 1747-6.5.3 June 1998

OC_DemandOutputScan OC_DemandOutputScan forces the scanner to immediately perform an output scan.

Syntax:

int OC_DemandOutputScan(HANDLE handle, int mode);

Parameters:

Description:

The scanner updates module outputs from the data in the output image. Use OC_WriteOutputImage to write

data to the output image.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

int retcode;

retcode = OC_DemandOutputScan( Handle, OCWAIT );

Parameter: Description:

handle

Must be a valid handle returned from OC_OpenScanner

mode

If mode is:

OCWAIT OC_DemandOutputScan waits for the output scan to be

completed before returning to the caller.

OCNOWAITOC_DemandOutputScan returns immediately.

Name: Value: Description:

SUCCESS

demand output request was successful

ERR_OCACCESS

handle does not have access to scanner

ERR_OCRESPONSE

scanner did not respond to request

ERR_OCSCANCFG

scanner has not been configured

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 64