VC++设计图形显示CPU内存利用率程序

来源:网络时间:2011-06-29 13:01:06

  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:NT

  typedef 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 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 (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;

  }

  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

  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:CMemUsgesCtl m_ MyMemCtrl;

  CCpuUsgesCtl m_ 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 m_MyCtrl Failed!");

  return 0;

  }

  2) 插入一个static控件,并从类向导中为其生成Control形变量,最后将变量的类型换为我们就行了

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