Rockwell Automation 1747-PCINT API Software for 1746 I/O - Manual (Page 78)

6–24 Library of Routines OC_GetExtendedError
Publication 1747-6.5.3 June 1998
Considerations:
Supported in the DOS API library and the Windows NT API library
Example:
HANDLE Handle;
OCEXTERRexterr;
int
retcode;
retcode = OC_GetExtendedError( Handle, &exterr );