extern "C" a_sql_uint32 ( extpf_use_new_api )();

The function returns an unsigned 32-bit integer. The returned value must be the interface version number, EXTPF_V1_API defined in extpfapiv1.h.

A typical implementation of this function is as follows:

extern "C" a_sql_uint32 ( extpf_use_new_api )( void )
{
   return EXTPF_V1_API;
}