virtual channel - Export VirtualChannelGetInstance function from c# -


i want export function c#:

hresult vcapitype virtualchannelgetinstance(  _in_    refiid refiid,  _inout_ ulong  *pnumobjs,  _out_   void   **ppobjarray );

i have tried following code:

public static uint virtualchannelgetinstance(intptr refiid, ref uint pnumobjs, ref intptr[] ppobjarray)   {       messagebox.show("virtualchannelgetinstance ");       return 0;  }

the problem when exported funciton c# called, nullreference exception. problem?

i got working changing virtualchannelgetinstance declaration:

public static uint virtualchannelgetinstance(guid refiid, ref ulong pnumobjs, void** ppobjarray)

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