windows任务管理器中cpu使用记录波形制作

Visual c+6.0程序设计从入门到精通 167页到171页中有windows任务管理器中cpu使用记录波形制作的教程，回家后可以好好学学。一、程序运行界面如下：二、程序思想与要点:1)、本程序分两种情况来获取CPU的利用率，NT下利用ntdll.dll中没有公开的API: NtQuerySystemInformation，9x下利用注册表来获取CPU的利用率code:NTtypedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG); PROCNTQSI NtQuerySystemInformation; 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; status = NtQuerySystemInformation(SystemTimeInformation, &SysTimeInfo,sizeof(SysTimeInfo),0); if (status!=NO_ERROR) return; / get new CPUs idle time status = NtQuerySystemInformation(SystemPerformanceInformation, &SysPerfInfo,sizeof(SysPerfInfo),NULL); if (status != NO_ERROR) return; / if its a first call - skip it if (m_liOldIdleTime.QuadPart != 0) / CurrentValue = NewValue - OldValue dbIdleTime = Li2Double(SysPerfInfo.liIdleTime) - Li2Double(m_liOldIdleTime); dbSystemTime = Li2Double(SysTimeInfo.liKeSystemTime) - Li2Double(m_liOldSystemTime); / CurrentCpuIdle = IdleTime / SystemTime dbIdleTime = dbIdleTime / dbSystemTime; / CurrentCpuUsage% = 100 - (CurrentCpuIdle * 100) / NumberOfProcessors dbIdleTime = 100.0 - dbIdleTime * 100.0 / (double)SysBaseInfo.bKeNumberProcessors + 0.5; m_fNewUsges = (UINT)dbIdleTime; 9x略2)、 通过 GlobalMemoryStatus来获取内存的使用情况code: MEMORYSTATUS MemStat;MemStat.dwLength = sizeof(MEMORYSTATUS);GlobalMemoryStatus(&MemStat);m_ulNewUsges = MemStat.dwMemoryLoad;3)、 程序中封装了两个类 CcpuUsgesCtl和CmemUsgesCtl，使用这两这个类可以实现CPU，内存利用率的定时读取，并以图形化的形式显示出来 三、使用 有两种使用方法，不过要先把这个类的文件 add to project 1).声明一个这两类的对象，并用create来动态生成 such as:CMemUsgesCtlm_ MyMemCtrl;CCpuUsgesCtlm_ MyCpuCtrl;if(!m_MyCpuCtrl.Create(WS_CHILD | WS_VISIBLE, rect, this, IDC_CPUCTL)TRACE0(Create m_MyCtrl Failed!);return 0;rect.left = rect.right + 20;rect.right += lpCreateStruct-cx / 2;if(!m_MyMemCtrl.Create(WS_CHILD | WS_VISIBLE,rect, this, IDC_MEMCTL)TRACE0(Create