cpu-use_CPU使用率_源码

//#define _WIN32_WINNT 0x500 #include "stdio.h" #include "stdlib.h" #include "windows.h" //#include <Winternl.h> #define SystemBasicInformation 0 #define SystemPerformanceInformation 2 #define SystemTimeInformation 3 #define SystemProcessorPerformanceInformation 8 #define Li2Double(x) ((double)((x).HighPart) * 4.294967296E9 + (double)((x).LowPart)) typedef struct { DWORD dwUnknown1; ULONG uKeMaximumIncrement; ULONG uPageSize; ULONG uMmNumberOfPhysicalPages; ULONG uMmLowestPhysicalPage; ULONG uMmHighestPhysicalPage; ULONG uAllocationGranularity; PVOID pLowestUserAddress; PVOID pMmHighestUserAddress; ULONG uKeActiveProcessors; BYTE bKeNumberProcessors; BYTE bUnknown2; WORD wUnknown3; } SYSTEM_BASIC_INFORMATION; //typedef struct //{ // LARGE_INTEGER liIdleTime; // DWORD dwSpare[76]; //} SYSTEM_PERFORMANCE_INFORMATION; typedef struct _SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION { LARGE_INTEGER IdleTime; LARGE_INTEGER KernelTime; LARGE_INTEGER UserTime; LARGE_INTEGER Reserved1[2]; ULONG Reserved2; } SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION, *PSYSTEM_PROCESSOR_PERFORMANCE_INFORMATION; typedef struct { LARGE_INTEGER liKeBootTime; LARGE_INTEGER liKeSystemTime; LARGE_INTEGER liExpTimeZoneBias; ULONG uCurrentTimeZoneId; DWORD dwReserved; } SYSTEM_TIME_INFORMATION; typedef LONG (WINAPI *PROCNTQSI)(UINT,PVOID,ULONG,PULONG); PROCNTQSI NtQuerySysInformation; //返回CPU数目 //参数Used为接收使用率的指针，len为可接收的个数 int GetCPUUsed(BYTE *Used, int len) { SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION SysProPerfInfo[8] = {0}; // SYSTEM_PERFORMANCE_INFORMATION SysPerfInfo[8] = {0}; SYSTEM_TIME_INFORMATION SysTimeInfo = {0}; SYSTEM_BASIC_INFORMATION SysBaseInfo = {0}; double dbIdleTime = 0.0; double dbSystemTime = 0.0; LONG status; static LARGE_INTEGER OldIdleTime[8] = {0}; static LARGE_INTEGER OldKernelTime[8] = {0}; // static LARGE_INTEGER liOldSystemTime = {0,0}; NtQuerySysInformation = (PROCNTQSI)GetProcAddress(GetModuleHandle("ntdll"),"NtQuerySystemInformation"); if (!NtQuerySysInformation) return -1; // get number of processors in the system status = NtQuerySysInformation(SystemBasicInformation,&SysBaseInfo,sizeof(SysBaseInfo),NULL); if (status != NO_ERROR) return -1; // status = NtQuerySysInformation(SystemTimeInformation,&SysTimeInfo,sizeof(SysTimeInfo),0); // if (status!=NO_ERROR) return -1; // status = NtQuerySystemInformation(SystemPerformanceInformation,&SysPerfInfo,sizeof(SysPerfInfo[0])*SysBaseInfo.bKeNumberProcessors,NULL); // if (status != NO_ERROR) return -1; // status = NtQuerySysInformation(SystemProcessorPerformanceInformation, SysProPerfInfo, sizeof(SysProPerfInfo[0])*SysBaseInfo.bKeNumberProcessors, NULL); if (status!=NO_ERROR) return -1; if (OldIdleTime[0].QuadPart != 0) { for (int i = 0; i < SysBaseInfo.bKeNumberProcessors && i < len; i ++) { double dbKernelTime = Li2Double(SysProPerfInfo[i].KernelTime) - Li2Double(OldKernelTime[i]); double dbIdleTime = Li2Double(SysProPerfInfo[i].IdleTime) - Li2Double(OldIdleTime[i]); dbIdleTime = dbIdleTime / dbKernelTime; double dbUsedTime = 100.0 - dbIdleTime * 100.0; // (double)SysBaseInfo.bKeNumberProcessors + 0.5; if (dbUsedTime < 0) dbUsedTime = 0; Used[i] = (BYTE)dbUsedTime; // char msg[12] = {0}; // sprintf(msg, "%d ", Used[i]); // printf(msg); // OutputDebugString(msg); } printf("\n"); } //改变新的CPU使用率和系统时间 for (int i = 0; i < SysBaseInfo.bKeNumberProcessors && i < len; i ++) { OldIdleTime[i] = SysProPerfInfo[i].IdleTime; OldKernelTime[i] = SysProPerfInfo[i].KernelTime; } return SysBaseInfo.bKeNumberProcessors < len ? SysBaseInfo.bKeNumberProcessors : len; // return 4; } int main() { while (1) { BYTE Used[8] = {0}; GetCPUUsed(Used, 8); Sleep(1000); } return 0; }