Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario descargar pdf (Pagina 130)

Publication 1747-UM002A-US-P - June 2000

6-70 Library of Routines

OC_WaitForEosDmdIn

Blocks the calling thread until a demand input end-of-scan (EOS)

notification is received from the scanner or

msTimeout milliseconds

have elapsed.

Syntax:

int OC_WaitForEosDmdIn(HANDLE handle,

DWORD msTimeout)

Parameters:

Description:

If a demand input EOS message has been received since the last

OCMSG_EOS_DMDIN message was retrieved with the

OC_PollScanner function, OC_WaitForEosDmdIn returns SUCCESS

immediately.

You can use this function to synchronize a control application with

the I/O scan. See the OC_EnableEOSNotify and

OC_DemandInputScan functions.

Return Value:

Considerations:

Supported in the Windows NT API library only.

Example:

HANDLE handle;

intrc;

MSGBUF eosMSG

/* Request an input scan, but don’t wait */

OC_DemandInputScan(handle, OCNOWAIT);

/* Could have other code here */

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

msTimeout Specifies the number of milliseconds to wait

Set to INFINITE to wait forever

Name: Value: Description:

SUCCESS 0 demand input EOS message was received

ERR_RESPONSE 10

msTimeout milliseconds elapsed without an EOS

ERR_OCACCESS 2

handle does not have access to scanner

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual de usuario Pagina 130