Creating Database Handles
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Every database that an application accesses must be associated with its own database handle, a pointer to a FILE structure that is used by all API database functions. The ibase.h header file contains the following C typedef declaration for database handles:
typedef void ISC_FAR *isc_db_handle;
To use this typedef for declaring database handles in an application, include ibase.h in each source file module:
#include <ibase.h>