xamarin.ios - How to Expose Objective-C Pointer Method WithResultBuffer in IOS Binding -

i'm trying invoke objective-c method

   -(nabto_status_t)nabtorpcinvoke:(nsstring *)url withresultbuffer:(char      **)jsonresponse; 

i used objective-sharpie tool generate follow method

 [export("nabtorpcinvoke:withresultbuffer:")]  unsafe nabto_status_t rpcinvoke(string url, ref byte jsonresponse); 

please expose me correctly can jsonresponse string can use in ios app.

i made these changes generated method

 [export("nabtorpcinvoke:withresultbuffer:")]         unsafe nabto_status_t rpcinvoke(string url, ref intptr         jsonresponse); 

and got jsonresonse follow.

        intptr buff=new intptr() ;         status = client.rpcinvoke(url, ref buff);          byte[] newarray = new byte[buff.toint32() + 1];          (int m = 0; m < buff.toint32(); m++)         {             byte b = marshal.readbyte(buff,m);             newarray[m] = b;         }           var jsonresponse = system.text.encoding.utf8.getstring(newarray);