Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador descarregar pdf (Página 104)

Publication 1747-UM002A-US-P - June 2000

6-44 Library of Routines

OC_PollScanner

OC_PollScanner reads module I/O interrupt, discrete input interrupt,

and end-of-scan notification messages from the scanner.

Syntax:

int OC_PollScanner(HANDLE handle, int MsgFilter,

MSGBUF *msgbuf);

Parameters:

Description:

The MSGBUF structure is defined as:

typedef struct {

BYTE MsgID;

BYTE MsgData[4];

} MSGBUF;

Parameter: Description:

handle Must be a valid handle returned from OC_OpenScanner

MsgFilter If

MsgFilter is:

OCMSG_DIINT

OCMSG_IOINT,

OCMSG_EOS, OC_PollScanner returns a message only

OCMSG_EOS_DMDIN of the corresponding type, if any

OCMSG_EOS_DMDOUT

OCMSG_ANY OC_PollScanner searches for a

message, in the order OCMSG_DIINT,

OCMSG_IOINT,

OCMSG_EOS_DMDIN,

OCMSG_EOS_DMDOUT, then

OCMSG_EOS, from any of the sources.

msgbuf A structure that contains scanner messages

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Rockwell-automation 1747-PCIS API Software - Open Controller Manual do Utilizador Página 104