Error-handling Requirements
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Most API functions return status information in an error status vector, an array of 20 longs. To handle InterBase error conditions, should they arise, applications should declare a status vector as follows:
#include <ibase.h>
. . .
ISC_STATUS status_vector[20];
ISC_STATUS is a #define in ibase.h provided for programming convenience and platform independence.
ibase.h also contains #define directives for all InterBase error conditions. Applications can use API error-handling functions to construct error messages from the status vector that are based on these error conditions, or can examine the status vector directly for particular error conditions using the #define directives in place of error numbers. Using #define directives in this manner makes source code easier to understand and maintain.
For more information about error handling, see Working with Events.