Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario descargar pdf (Pagina 138)

6–84 Library of Routines OC_WaitForExtError

Publication 1747-6.5.3 June 1998

OC_WaitForExtError Blocks the calling thread until an extended error is received from the scanner or

msTimeout milliseconds have elapsed.

Syntax:

int OC_WaitForExtError(HANDLE handle, DWORD msTimeout)

Parameters:

Description:

If an extended error has been received since the last extended error message was retrieved with the

OC_GetExtendedError function, OC_WaitForExtError returns SUCCESS immediately.

Return Value:

Considerations:

Supported in the Windows NT API library only.

Example:

HANDLE handle;

intrc;

OCEXTERRexterr

/* Error handler thread */

while(1) {/* loop forever */

OC_WaitForExtError(handle, INFINITE);

/* fetch the error data */

OC_GetExtendedError(handle, &exterr);

/*handle the error */

}

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 extended error occurred

ERR_RESPONSE

msTimeout milliseconds elapsed without an extended error

ERR_OCACCESS

handle does not have access to scanner

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Manual de usuario Pagina 138