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 程式師世界 >> 編程語言 >> C語言 >> VC >> vc教程 >> 如何獲得CPU使用率

如何獲得CPU使用率

編輯:vc教程

NT/2000方法:

#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 = NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0);
     if (status!=NO_ERROR)
       return;
     // get new CPU's idle time
     status = NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL);
     if (status != NO_ERROR)
       return;
     // if it's a first call - skip it
     if (liOldIdleTime.QuadPart != 0)
     {
       // CurrentValue = NewValue - OldValue
       dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime);
       dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);
       // CurrentCpuIdle = IdleTime / SystemTime
       dbIdleTime = dbIdleTime / dbSystemTime;
       // CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors
       dbIdleTime = 100.0 - dbIdleTime * 100.0 / (double)SysBaseInfo.bKeNumberProcessors + 0.5;
       printf("\b\b\b\b%3d%%",(UINT)dbIdleTime);
     }
     // store new CPU's idle and system time
     liOldIdleTime = SysPerfInfo.liIdleTime;
     liOldSystemTime = SysTimeInfo.liKeSystemTime;
     // wait one second
     Sleep(1000);
   }
   printf("\n");
}
//-------------------------------------------------------------
W9X:
#include <windows.h>
#include <conio.h>
#include <stdio.h>
void main(void)
{
   HKEY hkey;
   DWORD dwDataSize;
   DWORD dwType;
   DWORD dwCpuUsage;
   // starting the counter
   if ( RegOpenKeyEx( HKEY_DYN_DATA,
             "PerfStats\\StartStat",
             0,KEY_ALL_ACCESS,
             &hkey ) != ERROR_SUCCESS)
     return;
   dwDataSize=sizeof(DWORD);
   RegQueryValueEx( hkey,
            "KERNEL\\CPUUsage",
            NULL,&dwType,
            (LPBYTE)&dwCpuUsage,
            &dwDataSize );
   RegCloseKey(hkey);
   
   // geting current counter's value
   if ( RegOpenKeyEx( HKEY_DYN_DATA,
             "PerfStats\\StatData",
             0,KEY_READ,
             &hkey ) != ERROR_SUCCESS)
     return;
   printf("\nCPU Usage (press any key to exit):  ");
   while(!_kbhit())
   {
     dwDataSize=sizeof(DWORD);
     RegQueryValueEx( hkey,
              "KERNEL\\CPUUsage",
              NULL,&dwType,
              (LPBYTE)&dwCpuUsage,
              &dwDataSize );
     Sleep(500);
     printf("\b\b\b\b%3d%%",dwCpuUsage);
   }
   printf("\n");
   RegCloseKey(hkey);
   
   // stoping the counter
   if ( RegOpenKeyEx( HKEY_DYN_DATA,
             "PerfStats\\StopStat",
             0,KEY_ALL_ACCESS,
             &hkey ) != ERROR_SUCCESS)
     return;
   dwDataSize=sizeof(DWORD);
   RegQueryValueEx( hkey,
            "KERNEL\\CPUUsage",
            NULL,&dwType,
            (LPBYTE)&dwCpuUsage,
            &dwDataSize );
   RegCloseKey(hkey);
}

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