Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Pobierz pdf (Strona 76)

Publication 1747-UM002A-US-P - June 2000

6-16 Library of Routines

Description:

This function is useful when displaying an error message. You should

use OC_GetExtendedError to obtain the message before using

OC_ExtendedErrorMsg to display the message. If you don’t use

OC_GetExtendedError first, OC_ExtendedErrorMsg displays a null

message.

The

OCEXTERR structure is defined as:

#define OCERRDATASIZE3/* number of bytes of error data */

typedef struct tagOCEXTERR

{

BYTEErrorCode;/* Extended error code */

BYTESlotNum;/* Associated slot number */

BYTEErrorData[OCERRDATASIZE];/* Error code data

} OCEXTERR;

See appendix A for error codes.

Return Value:

Considerations:

Supported in the DOS API library and the Windows NT API library

Example:

HANDLE Handle;

OCEXTERR exterr;

char *msg;

int retcode;

/* Should already have called

OC_GetExtendedError() to obtain exterr */

retcode = OC_ExtendedErrorMsg( Handle, &exterr,

&msg );

printf(“ERROR:%s\n”, msg);

Name: Value: Description:

SUCCESS 0 extended error information was read successfully

ERR_OCACCESS 2 handle does not have access to scanner

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Rockwell-automation 1747-PCIS API Software - Open Controller Instrukcja Użytkownika Strona 76