Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál stáhnout pdf (Strana 72)

6–18 Library of Routines OC_ErrorMsg

Publication 1747-6.5.3 June 1998

OC_ErrorMsg OC_ErrorMsg returns a descriptive text message associated with the API return

value errcode.

Syntax:

int OC_ErrorMsg(int errcode, char **msg);

Description:

The null-terminated message string is placed in a static buffer that is reused each time this function is called.

A pointer to this buffer is returned in

msg.

Return Value:

Considerations:

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

Example:

HANDLE Handle;

char *msg;

int rc;

if (SUCCESS != (rc = OC_OpenScanner(&Handle)))

{

/* Open failed - display error message */

OCErrorMsg(rc, &msg);

printf(“Error: %s\n”, msg);

}

Name: Description:

SUCCESS

errcode was valid. msg points to corresponding error description.

ERR_OCPARAM

errcode was invalid. msg points to unknown error code string.

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Rockwell-automation 1747-PCINT API Software for 1746 I/O Uživatelský manuál Strana 72