.net - Why I need to use Public Structure _PROCESSOR_INFO_UNION? -

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for need use public structure "_processor_info_union"? without "dwnumberofprocessors" returns 15 instead of real number of processors, when used it's returns 4

imports system.runtime.interopservices public class form1 <dllimport("kernel32.dll")> _ public shared sub getsysteminfo(<marshalas(unmanagedtype.struct)> byref    lpsysteminfo system_info) end sub  <structlayout(layoutkind.sequential)> _     public structure system_info     friend uprocessorinfo _processor_info_union     public dwpagesize uinteger     public lpminimumapplicationaddress intptr     public lpmaximumapplicationaddress intptr     public dwactiveprocessormask intptr     public dwnumberofprocessors uinteger     public dwprocessortype uinteger     public dwallocationgranularity uinteger     public dwprocessorlevel ushort     public dwprocessorrevision ushort end structure  <structlayout(layoutkind.explicit)> _ public structure _processor_info_union     '<fieldoffset(0)> _     'friend dwoemid uinteger     '<fieldoffset(0)> _     'friend wprocessorarchitecture ushort     '<fieldoffset(2)> _     'friend wreserved ushort end structure   private sub button1_click(byval sender system.object, byval e system.eventargs) handles button1.click       dim infos new system_info      getsysteminfo(infos)     textbox2.text = (infos.dwnumberofprocessors)  end sub end class

the modern processors can have virtual cores, , there fore actual number of physical processors found on machine have use such syntax.

i've asked similar question time ago such situation c# code, , there got great answer how invoke it:

pinvoke getlogicalprocessorinformation function


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