Called when a data record filter is removed. This function cleans up resources that are used by that filter.
NINT ctfiltercbRemoveFilter(pTEXT libname, pTEXT funcname, pTEXT params,
pVOID libhandle, pVOID flthandle);
FairCom DB maintains a list of the names of the callback DLLs it has loaded. A DLL remains loaded until FairCom DB shuts down.
LoadFilter() can allocate memory for use by the filter callback function and can return its address in this parameter.
ctfiltercbAddFilter, EvaluateFilter, LoadFilter, UnloadFilter, SetDataFilter