Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Pobierz pdf (Strona 129)

Publication 1747-UM002A-US-P - June 2000

Library of Routines 6-69

OC_WaitForEos

Blocks the calling thread until an end-of-scan (EOS) notification is

received from the scanner or

msTimeout milliseconds have elapsed.

Syntax:

int OC_WaitForEos(HANDLE handle, DWORD msTimeout)

Parameters:

Description:

If an EOS message has been received since the last OCMSG_EOS

message was retrieved with the OC_PollScanner function,

OC_WaitForEos returns SUCCESS immediately.

You can use this function to synchronize a control application with

the I/O scan. See the OC_EnableEOSNotify function.

Return Value:

Considerations:

Supported in the Windows NT API library only.

Example:

HANDLE handle;

intrc;

MSGBUF eosMSG

/* Wait for 10 seconds for the EOS */

rc = OC_WaitForEos(handle, 10000);

switch(rc) {

case SUCCESS: /* got EOS*/

/* reset the EOS event*/

OC_PollScanner (handle,OCMSG_EOS,&eosMSG);

break;

case ERR_OCRESPONSE:/* timed out */

printf(“\nTimed out waiting for EOS\n”);

break;

default;

printf(“\nError!\n”);

break;

}

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 an 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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