获取CPU使用率

 

方法如下两种：

一、获取CPU使用率常用方法如下,当时该方法说明使用在2000 和 xp，随后系统不可用

不过测试，在win2003 下是可行的，在win2008 win7 下将会失败，查资料有NtQuerySystemInformation

的升级版NtQuerySystemInformationEx 不过没找到资料……

 

typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG);

PROCNTQSI NtQuerySystemInformation;

 

typedef BOOL (WINAPI *PGETSYSTIMES)(LPFILETIME ,LPFILETIME,LPFILETIME);

PGETSYSTIMES GetSysTimes;

 

#include <stdio.h>#include <string>#include <windows.h> #include <conio.h> using namespace std;#define SystemBasicInformation 0 #define SystemPerformanceInformation 2 #define SystemTimeInformation 3#define Li2Double(x) ((double)((x).HighPart) * 4.294967296E9 + (double)((x).LowPart))#define GETPROADDR_ERR 0x00000003 //系统基本信息结构体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;//系统前端结构体typedef struct { LARGE_INTEGER liIdleTime; DWORD dwSpare[76]; } SYSTEM_PERFORMANCE_INFORMATION;//系统时间信息结构体typedef struct { LARGE_INTEGER liKeBootTime; LARGE_INTEGER liKeSystemTime; LARGE_INTEGER liExpTimeZoneBias; ULONG uCurrentTimeZoneId; DWORD dwReserved; } SYSTEM_TIME_INFORMATION;long CCPUInfo::GetCpuSpeed1(double &tCpuUsed){SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo; SYSTEM_TIME_INFORMATION SysTimeInfo; SYSTEM_BASIC_INFORMATION SysBaseInfo; double dbIdleTime; double dbSystemTime; LONG status = 0; LARGE_INTEGER liOldIdleTime = {0,0}; LARGE_INTEGER liOldSystemTime = {0,0};NtQuerySystemInformation = (PROCNTQSI)GetProcAddress(GetModuleHandle(L"ntdll"),"NtQuerySystemInformation");if (!NtQuerySystemInformation) return GETPROADDR_ERR;// 获得本机处理器个数status = NtQuerySystemInformation(SystemBasicInformation,&SysBaseInfo,sizeof(SysBaseInfo),NULL); if (status != NO_ERROR) return status;while(!_kbhit()) { // 获得新的系统时间status = NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0); if (status!=NO_ERROR) return status;// 获得一个新的CPU idle时间 2008下该函数出错status =NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL); if (status != NO_ERROR) return status;// 获取CPU使用率 if (liOldIdleTime.QuadPart != 0) { // CPU使用率为新的时间-旧的时间 dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(liOldIdleTime); dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(liOldSystemTime);// 获得CPU使用情况 dbIdleTime = dbIdleTime / dbSystemTime;//获得CPU使用率 dbIdleTime = 100.0 - dbIdleTime * 100.0 / (double)SysBaseInfo.bKeNumberProcessors + 0.5;if((UINT)dbIdleTime != 0) {tCpuUsed = (double)dbIdleTime;break;}}// 获得新的CPU's idle和系统时间liOldIdleTime = SysPerfInfo.liIdleTime; liOldSystemTime = SysTimeInfo.liKeSystemTime;// 延时一秒Sleep(100); } if(tCpuUsed > 100){tCpuUsed = 100;}if(tCpuUsed < 0){tCpuUsed = 1;}return status;} 

 

二、普通方法获取CPU：

__int64 CCPUInfo::CompareFileTime ( FILETIME time1, FILETIME time2 ){__int64 a = time1.dwHighDateTime << 32 | time1.dwLowDateTime ;__int64 b = time2.dwHighDateTime << 32 | time2.dwLowDateTime ;return (b - a);}long CCPUInfo::GetCpuSpeed(double &tCpuUsed){ HANDLE hEvent;BOOL res ;LONG status = 0; //FILETIME preidleTime;FILETIME prekernelTime;FILETIME preuserTime;//FILETIME idleTime;FILETIME kernelTime;FILETIME userTime;HINSTANCE hKernel = LoadLibrary( _T("Kernel32.dll") );if (hKernel == NULL){return (GetLastError());}GetSysTimes = (PGETSYSTIMES)GetProcAddress(hKernel,"GetSystemTimes");if( GetSysTimes == NULL ){return (GetLastError());}res = GetSysTimes( &idleTime, &kernelTime, &userTime );if (!res){return GetLastError();}preidleTime = idleTime;prekernelTime = kernelTime;preuserTime = userTime ;hEvent = CreateEvent (NULL,FALSE,FALSE,NULL); // 初始值为 nonsignaled ，并且每次触发后自动设置为nonsignaledwhile (1){WaitForSingleObject( hEvent,500); //等待500毫秒res = GetSysTimes( &idleTime, &kernelTime, &userTime );if (!res){return GetLastError();}__int64 idle = CompareFileTime( preidleTime,idleTime);__int64 kernel = CompareFileTime( prekernelTime, kernelTime);__int64 user = CompareFileTime(preuserTime, userTime);double cpu = (((double)(kernel + user - idle)/(double)(kernel+user))*100+0.5);if((UINT)cpu != 0) {tCpuUsed = cpu;break;}preidleTime = idleTime;prekernelTime = kernelTime;preuserTime = userTime ;}if(tCpuUsed > 100){tCpuUsed = 100;}if(tCpuUsed < 0){tCpuUsed = 1;}return status;}