Rockwell-automation 1747-PCIS API Software - Open Controller Uživatelský manuál stáhnout pdf (Strana 134)

Publication 1747-UM002A-US-P - June 2000

6-74 Library of Routines

OC_WaitForIoInt

Blocks the calling thread until a module interrupt is received from the

scanner or

msTimeout milliseconds have elapsed.

Syntax:

int OC_WaitForIoInt(HANDLE handle, DWORD msTimeout)

Parameters:

Description:

If a module interrupt has been received since the last OCMSG_IOINT

message was retrieved with the OC_PollScanner function,

OC_WaitForIoInt returns SUCCESS immediately.

Return Value:

Considerations:

Supported in the Windows NT API library only.

Example:

HANDLE handle;

intrc;

MSGBUF mintMSG

/* Wait for 10 seconds for a module interrupt*/

rc = OC_WaitForIoInt(handle, 10000);

switch(rc) {

case SUCCESS: /* got a module interrupt*/

/* fetch the module interrupt message */

OC_PollScanner (handle,OCMSG_IOINT,&mintMSG);

/* handle the module interrupt */

break;

case ERR_OCRESPONSE:/* timed out */

printf(“\nTimed out waiting for module interrupt\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 a module interrupt was received

ERR_RESPONSE 10

msTimeout milliseconds elapsed without a module interrupt

ERR_OCACCESS 2

handle does not have access to scanner

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