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泌採資誼CPU聞喘楕

作者 佚名技术 来源 程序设计 浏览 发布时间 2012-06-30

NT/2000圭隈?

#include <windows.h>
#include <conio.h>
#include <stdio.h>
#define SystemBasicInformation    0
#define SystemPerformanceInformation 2
#define SystemTimeInformation    3
#define Li2Double(x) ((double)((x).HighPart) * 4.294967296E9 + (double)((x).LowPart))
typedef struct
{
   DWORD  dwUnknown1;
   ULONG  uKeMaximumIncrement;
   ULONG  uPageSize;
   ULONG  uMmNumberOfPhysicalPages;
   ULONG  uMmLowestPhysicalPage;
   ULONG  uMmHighestPhysicalPage;
   ULONG  uAllocationGranularity;
   PVOID  pLowestUserAddress;
   PVOID  pMmHighestUserAddress;
   ULONG  uKeActiveProcessors;
   BYTE  bKeNumberProcessors;
   BYTE  bUnknown2;
   WORD  wUnknown3;
} SYSTEM_BASIC_INFORMATION;
typedef struct
{
   LARGE_INTEGER  liIdleTime;
   DWORD      dwSpare[76];
} SYSTEM_PERFORMANCE_INFORMATION;
typedef struct
{
   LARGE_INTEGER liKeBootTime;
   LARGE_INTEGER liKeSystemTime;
   LARGE_INTEGER liExpTimeZoneBias;
   ULONG     uCurrentTimeZoneId;
   DWORD     dwReserved;
} SYSTEM_TIME_INFORMATION;
// ntdll!NtQuerySystemInformation (NT specific!)
//
// The function copies the system information of the
// specified type into a buffer
//
// NTSYSAPI
// NTSTATUS
// NTAPI
// NtQuerySystemInformation(
//  IN UINT SystemInformationClass,  // information type
//  OUT PVOID SystemInformation,    // pointer to buffer
//  IN ULONG SystemInformationLength, // buffer size in bytes
//  OUT PULONG ReturnLength OPTIONAL  // pointer to a 32-bit
//                    // variable that receives
//                    // the number of bytes
//                    // written to the buffer
// );
typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG);
PROCNTQSI NtQuerySystemInformation;
void main(void)
{
   SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo;
   SYSTEM_TIME_INFORMATION    SysTimeInfo;
   SYSTEM_BASIC_INFORMATION    SysBaseInfo;
   double             dbIdleTime;
   double             dbSystemTime;
   LONG              status;
   LARGE_INTEGER         liOldIdleTime = {0,0};
   LARGE_INTEGER         liOldSystemTime = {0,0};
   NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(
                      GetModuleHandle("ntdll"),
                      "NtQuerySystemInformation"
                      );
   if (!NtQuerySystemInformation)
     return;
   // get number of processors in the system
   status = NtQuerySystemInformation(SystemBasicInformation,&SysBaseInfo,sizeof(SysBaseInfo),NULL);
   if (status != NO_ERROR)
     return;
   
printf("\nCPU Usage (press any key to exit):  ");
   while(!_kbhit())
   {
     // get new system time
   status = NtQuerySystemInfo

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