[文章导读] 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
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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: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
效果图:
结束语
控件利用内存来绘图,实现了无闪烁显示,欢迎指教!
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