ZwQuerySystemInformation

typedef BOOL  (__stdcall *ZwQuerySystemInformations)(
SYSTEM_INFORMATION_CLASS SystemInformationClass,
PVOID SystemInformation,
ULONG SystemInformationLength,
PULONG ReturnLength
);

SYSTEM_INFORMATION_CLASS SystemInformationClass

#include <ddk/ntapi.h>

static char Buffer[1000];static DWORD Byet=0x008;
ZwQuerySystemInformation(SystemSummaryMemoryInformation,Buffer,Byet,NULL);
MessageBox(hwnd,Buffer,"",MB_OK);

static int a;
      static char Buffer[1000];static DWORD Byet=0x00C;
 
    switch (message)                  /* handle the messages */
    {
      
      case WM_CHAR:
a =  ZwQuerySystemInformation(SystemProcessorInformation,Buffer,Byet,NULL);
 if(a==0){Beep(500,500);
 Byet=GetLastError();
 itoa(Byet,Buffer,16);MessageBox(hwnd,Buffer,"",MB_OK);
 }
 if(a!=0){MessageBox(hwnd,Buffer,"",MB_OK);}          
           break;

case WM_CREATE:
{
   SYSTEM_BASIC_INFORMATION sbi;
   ULONG ReturnLength = 0;
                   
   ZwQuerySystemInformation(SystemBasicInformation, &sbi, 
      sizeof(SYSTEM_BASIC_INFORMATION), &ReturnLength);
                   
   char buffer[256];
   sprintf(buffer, "number processors : %d", sbi.NumberProcessors);
   MessageBoxA(hwnd, buffer, "title", MB_OK);
}
break;