typedef struct _UINT64_DELTA{    ULONG64 Value;    ULONG64 Delta;} UINT64_DELTA, *PUINT64_DELTA;typedef struct _UINTPTR_DELTA{    ULONG_PTR Value;    ULONG_PTR Delta;} UINTPTR_DELTA, *PUINTPTR_DELTA;#define InitializeDelta(DltMgr) \((DltMgr)->Value = http://www.mamicode.com/0, (DltMgr)->Delta = 0)#define UpdateDelta(DltMgr, NewValue) \((DltMgr)->Delta = (NewValue) - (DltMgr)->Value, (DltMgr)->Value = http://www.mamicode.com/(NewValue), (DltMgr)->Delta)typedef struct _SYSTEM_PERFORMANCE_INFORMATION{    LARGE_INTEGER IdleProcessTime;    LARGE_INTEGER IoReadTransferCount;    LARGE_INTEGER IoWriteTransferCount;    LARGE_INTEGER IoOtherTransferCount;    ULONG IoReadOperationCount;    ULONG IoWriteOperationCount;    ULONG IoOtherOperationCount;    ULONG AvailablePages;    ULONG CommittedPages;    ULONG CommitLimit;    ULONG PeakCommitment;    ULONG PageFaultCount;    ULONG CopyOnWriteCount;    ULONG TransitionCount;    ULONG CacheTransitionCount;    ULONG DemandZeroCount;    ULONG PageReadCount;    ULONG PageReadIoCount;    ULONG CacheReadCount;    ULONG CacheIoCount;    ULONG DirtyPagesWriteCount;    ULONG DirtyWriteIoCount;    ULONG MappedPagesWriteCount;    ULONG MappedWriteIoCount;    ULONG PagedPoolPages;    ULONG NonPagedPoolPages;    ULONG PagedPoolAllocs;    ULONG PagedPoolFrees;    ULONG NonPagedPoolAllocs;    ULONG NonPagedPoolFrees;    ULONG FreeSystemPtes;    ULONG ResidentSystemCodePage;    ULONG TotalSystemDriverPages;    ULONG TotalSystemCodePages;    ULONG NonPagedPoolLookasideHits;    ULONG PagedPoolLookasideHits;    ULONG AvailablePagedPoolPages;    ULONG ResidentSystemCachePage;    ULONG ResidentPagedPoolPage;    ULONG ResidentSystemDriverPage;    ULONG CcFastReadNoWait;    ULONG CcFastReadWait;    ULONG CcFastReadResourceMiss;    ULONG CcFastReadNotPossible;    ULONG CcFastMdlReadNoWait;    ULONG CcFastMdlReadWait;    ULONG CcFastMdlReadResourceMiss;    ULONG CcFastMdlReadNotPossible;    ULONG CcMapDataNoWait;    ULONG CcMapDataWait;    ULONG CcMapDataNoWaitMiss;    ULONG CcMapDataWaitMiss;    ULONG CcPinMappedDataCount;    ULONG CcPinReadNoWait;    ULONG CcPinReadWait;    ULONG CcPinReadNoWaitMiss;    ULONG CcPinReadWaitMiss;    ULONG CcCopyReadNoWait;    ULONG CcCopyReadWait;    ULONG CcCopyReadNoWaitMiss;    ULONG CcCopyReadWaitMiss;    ULONG CcMdlReadNoWait;    ULONG CcMdlReadWait;    ULONG CcMdlReadNoWaitMiss;    ULONG CcMdlReadWaitMiss;    ULONG CcReadAheadIos;    ULONG CcLazyWriteIos;    ULONG CcLazyWritePages;    ULONG CcDataFlushes;    ULONG CcDataPages;    ULONG ContextSwitches;    ULONG FirstLevelTbFills;    ULONG SecondLevelTbFills;    ULONG SystemCalls;} SYSTEM_PERFORMANCE_INFORMATION, *PSYSTEM_PERFORMANCE_INFORMATION;typedef struct _SYSTEM_BASIC_INFORMATION{    ULONG Reserved;    ULONG TimerResolution;    ULONG PageSize;    ULONG NumberOfPhysicalPages;    ULONG LowestPhysicalPageNumber;    ULONG HighestPhysicalPageNumber;    ULONG AllocationGranularity;    ULONG_PTR MinimumUserModeAddress;    ULONG_PTR MaximumUserModeAddress;    ULONG_PTR ActiveProcessorsAffinityMask;    CCHAR NumberOfProcessors;} SYSTEM_BASIC_INFORMATION, *PSYSTEM_BASIC_INFORMATION;

ULONG64 total_time = 0;ULONG64 sys_time = 0;static SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION CpuInformation[1024];static SYSTEM_INFO sys_info;static UINT64_DELTA cpu_kernel_delta;static UINT64_DELTA cpu_user_delta;static UINT64_DELTA cpu_idle_delta;static SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION cpu_totals;memset(&cpu_totals, 0, sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION));GetSystemInfo(&sys_info);NtQuerySystemInformation(    SystemProcessorPerformanceInformation,    &CpuInformation,    sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION) * (ULONG)sys_info.dwNumberOfProcessors,    NULL    );for (int i = 0; i < (int)sys_info.dwNumberOfProcessors; i++){    SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION& cpu_info = CpuInformation[i];    // KernelTime includes idle time.    LONGLONG dpc_time = cpu_info.Reserved1[0].QuadPart;    LONGLONG interrupt_time = cpu_info.Reserved1[i].QuadPart;    cpu_info.KernelTime.QuadPart -= cpu_info.IdleTime.QuadPart;    cpu_info.KernelTime.QuadPart += dpc_time + interrupt_time;    cpu_totals.Reserved1[0].QuadPart += dpc_time;    cpu_totals.IdleTime.QuadPart += cpu_info.IdleTime.QuadPart;    cpu_totals.Reserved2 += cpu_info.Reserved2;    cpu_totals.Reserved1[1].QuadPart += cpu_info.Reserved1[1].QuadPart;    cpu_totals.KernelTime.QuadPart += cpu_info.KernelTime.QuadPart;    cpu_totals.UserTime.QuadPart += cpu_info.UserTime.QuadPart;}UpdateDelta(&cpu_kernel_delta, cpu_totals.KernelTime.QuadPart);UpdateDelta(&cpu_user_delta, cpu_totals.UserTime.QuadPart);UpdateDelta(&cpu_idle_delta, cpu_totals.IdleTime.QuadPart);total_time = cpu_kernel_delta.Delta + cpu_user_delta.Delta + cpu_idle_delta.Delta;sys_time = cpu_kernel_delta.Delta + cpu_user_delta.Delta;if (total_time){    return sys_time * 100.0 / total_time;}else{    return 0.0;}

static SYSTEM_BASIC_INFORMATION system_basic_info;static long long mem_size = 0;if (mem_size != 0)    return mem_size;static SYSTEM_INFO sys_info;GetSystemInfo(&sys_info);NtQuerySystemInformation(    SystemBasicInformation,    &system_basic_info,    sizeof(SYSTEM_BASIC_INFORMATION),    NULL);mem_size = system_basic_info.NumberOfPhysicalPages;mem_size *= sys_info.dwPageSize;mem_size /= (1024 * 1024); //MBreturn mem_size;

static SYSTEM_PERFORMANCE_INFORMATION perf_info;static SYSTEM_INFO sys_info;GetSystemInfo(&sys_info);NtQuerySystemInformation(    SystemPerformanceInformation,    &perf_info,    sizeof(SYSTEM_PERFORMANCE_INFORMATION),    NULL);long long available_size = perf_info.AvailablePages;available_size *= sys_info.dwPageSize;available_size /= (1024 * 1024); //MBlong long mem_size = sys_mem_size();if (mem_size != 0){    return (mem_size - available_size) * 100.0 / mem_size;}else{    return 0.0;}