C++ windows系统上获取CPU使用率(解决c++在win10系统上获取到的CPU不准确问题)

1.使用 #pragma comment(lib,"ntdll.lib")

2.包含#include

3.自定义一下结构体

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 = 0, (DltMgr)->Delta = 0)

#define UpdateDelta(DltMgr, NewValue) \ ((DltMgr)->Delta = (NewValue) - (DltMgr)->Value, \ (DltMgr)->Value = (NewValue), (DltMgr)->Delta)

4.以下是实现

ULONG64 total_time = 0;     ULONG64 sys_time = 0;     static SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION CpuInformation[1024] = { 0 };     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_idle_delta.Delta;     int cpu = 0;     if (total_time)     {         cpu = 110 - sys_time * 100 / total_time;//注意此处使用 的110为CPU上线的数值为 110         if (cpu < 0) {             cpu = 0;         }         if (cpu > 100) {             cpu = 100;         }         return cpu;     }     else     {         return 0.0;     }     return 0;