Rockwell-automation 1747-PCINT API Software for 1746 I/O Instrukcja Użytkownika Pobierz pdf (Strona 132)

6–78 Library of Routines OC_WaitForEos

Publication 1747-6.5.3 June 1998

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.

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

an EOS message was received

ERR_RESPONSE

msTimeout milliseconds elapsed without an EOS

ERR_OCACCESS

handle does not have access to scanner

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Instrukcja Użytkownika Strona 132