/// <summary>
/// Creates delegates for the FDI* operation functions.
/// </summary>
private void populateDelegates()
{
// if a delegate is re-located by a garbage collection, it will not affect
// the underlaying managed callback, so Alloc is used to add a reference
// to the delegate, allowing relocation of the delegate, but preventing
// disposal. Using GCHandle without pinning reduces fragmentation potential
// of the managed heap.
_allocDelegate = new CabinetNativeApi.FdiAllocDelegate(CabinetNativeApi.FdiAlloc);
_fdiAllocHandle = GCHandle.Alloc(_allocDelegate);
_freeDelegate = new CabinetNativeApi.FdiFreeDelegate(CabinetNativeApi.FdiFree);
_fdiFreeHandle = GCHandle.Alloc(_freeDelegate);
_openDelegate = new CabinetNativeApi.FdiOpenDelegate(CabinetNativeApi.FdiOpen);
_fdiOpenHandle = GCHandle.Alloc(_openDelegate);
_readDelegate = new CabinetNativeApi.FdiReadDelegate(CabinetNativeApi.FdiRead);
_fdiReadHandle = GCHandle.Alloc(_readDelegate);
_writeDelegate = new CabinetNativeApi.FdiWriteDelegate(CabinetNativeApi.FdiWrite);
_fdiWriteHandle = GCHandle.Alloc(_writeDelegate);
_closeDelegate = new CabinetNativeApi.FdiCloseDelegate(CabinetNativeApi.FdiClose);
_fdiCloseHandle = GCHandle.Alloc(_closeDelegate);
_seekDelegate = new CabinetNativeApi.FdiSeekDelegate(CabinetNativeApi.FdiSeek);
_fdiSeekHandle = GCHandle.Alloc(_seekDelegate);
_notifyDelegate = new CabinetNativeApi.FdiNotifyDelegate(CabinetNativeApi.FdiNotify);
_fdiNotifyHandle = GCHandle.Alloc(_notifyDelegate);
}