说明：1。内部使用timer定时器，自动刷新，使外部使用十分明了；2。主程序要有消息循环
[cpp] view plain copy print? //========================================================= // // Copyright (c) 2000-2004 iWise Technologies，Co. Ltd. // All Rights Reserved. // // Product: iW988 // File: CpuUsage.h // Created: 天衣有缝 // // Description: // ValueAdded main program for iW988. // Contact: // waterpub@mail.csdn.net // //========================================================= #pragma once #define SystemBasicInformation 0 #define SystemPerformanceInformation 2 #define SystemTimeInformation 3 #define Li2Double(x) ((double)((x).HighPart) * 4.294967296E9 + (double)((x).LowPart)) class CCpuUsage { public: CCpuUsage(); ~CCpuUsage(); public: int GetCpuUsage(); //得到系统cpu利用率 int SetRefreshInterval(int milli_sec); //定时刷新间隔 private: //类型定义 typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG); 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; //变量定义 SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo; SYSTEM_TIME_INFORMATION SysTimeInfo; SYSTEM_BASIC_INFORMATION SysBaseInfo; double dbIdleTime; double dbSystemTime; LONG status; LARGE_INTEGER liOldIdleTime; LARGE_INTEGER liOldSystemTime; PROCNTQSI NtQuerySystemInformation; int m_nCpuUsage; //定时 HWND m_hWnd; int m_nRefreshInterval;//默认为1000毫秒 int m_nTimerID; private: static void CalcCpuUsage(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime); int OnTimer(); }; inline CCpuUsage::CCpuUsage() { // m_hWnd = NULL; m_nRefreshInterval = 1000; m_nTimerID = 1000; m_nCpuUsage = 0; // memset(&liOldIdleTime , 0, sizeof(LARGE_INTEGER)); memset(&liOldSystemTime, 0, sizeof(LARGE_INTEGER)); // 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; // create control for timer m_hWnd = ::CreateWindow("static", "", 0, 0, 0, 0, 0, NULL, NULL, 0, NULL); ::SetWindowLong(m_hWnd , GWL_USERDATA , (long)(this) ); TIMERPROC tp = (TIMERPROC)CalcCpuUsage; SetTimer(m_hWnd , m_nTimerID, m_nRefreshInterval, tp); } inline CCpuUsage::~CCpuUsage() { KillTimer(m_hWnd , m_nTimerID); DestroyWindow(m_hWnd); } inline void CCpuUsage::CalcCpuUsage( HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime ){ CCpuUsage* pCpu = (CCpuUsage*)::GetWindowLong(hwnd , GWL_USERDATA); if ( pCpu ) { pCpu->OnTimer(); } } inline int CCpuUsage::OnTimer() { status =NtQuerySystemInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0); if (status!=NO_ERROR) return 0; // get new CPU's idle time status =NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo),NULL); if (status != NO_ERROR) return 0; // 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; m_nCpuUsage = (UINT)dbIdleTime; } // store new CPU's idle and system time liOldIdleTime = SysPerfInfo.liIdleTime; liOldSystemTime = SysTimeInfo.liKeSystemTime; // wait one second return 0; } inline int CCpuUsage::GetCpuUsage() { return m_nCpuUsage; } inline int CCpuUsage::SetRefreshInterval(int milli_sec) { m_nRefreshInterval = milli_sec; if ( m_hWnd ) { TIMERPROC tp = (TIMERPROC)CalcCpuUsage; SetTimer(m_hWnd, m_nTimerID, m_nRefreshInterval ,tp); } return 0; }
