Windows下用C语言获取进程cpu使用率

#include "stdafx.h" #include <windows.h> #include "psapi.h" #include <assert.h> #include "process_stat.h" /// 时间转换 static uint64_t file_time_2_utc(const FILETIME* ftime) { LARGE_INTEGER li; assert(ftime); li.LowPart = ftime->dwLowDateTime; li.HighPart = ftime->dwHighDateTime; return li.QuadPart; } /// 获得CPU的核数 static int get_processor_number() { SYSTEM_INFO info; GetSystemInfo(&info); return (int)info.dwNumberOfProcessors; } int get_cpu_usage() { //cpu数量 static int processor_count_ = -1; //上一次的时间 static int64_t last_time_ = 0; static int64_t last_system_time_ = 0; FILETIME now; FILETIME creation_time; FILETIME exit_time; FILETIME kernel_time; FILETIME user_time; int64_t system_time; int64_t time; int64_t system_time_delta; int64_t time_delta; int cpu = -1; if(processor_count_ == -1) { processor_count_ = get_processor_number(); } GetSystemTimeAsFileTime(&now); if (!GetProcessTimes(GetCurrentProcess(), &creation_time, &exit_time, &kernel_time, &user_time)) { // We don't assert here because in some cases (such as in the Task Manager) // we may call this function on a process that has just exited but we have // not yet received the notification. return -1; } system_time = (file_time_2_utc(&kernel_time) + file_time_2_utc(&user_time)) / processor_count_; time = file_time_2_utc(&now); if ((last_system_time_ == 0) || (last_time_ == 0)) { // First call, just set the last values. last_system_time_ = system_time; last_time_ = time; return -1; } system_time_delta = system_time - last_system_time_; time_delta = time - last_time_; assert(time_delta != 0); if (time_delta == 0) return -1; // We add time_delta / 2 so the result is rounded. cpu = (int)((system_time_delta * 100 + time_delta / 2) / time_delta); last_system_time_ = system_time; last_time_ = time; return cpu; } int get_memory_usage(uint64_t* mem, uint64_t* vmem) { PROCESS_MEMORY_COUNTERS pmc; if(GetProcessMemoryInfo(GetCurrentProcess(), &pmc, sizeof(pmc))) { if(mem) *mem = pmc.WorkingSetSize; if(vmem) *vmem = pmc.PagefileUsage; return 0; } return -1; } int get_io_bytes(uint64_t* read_bytes, uint64_t* write_bytes) { IO_COUNTERS io_counter; if(GetProcessIoCounters(GetCurrentProcess(), &io_counter)) { if(read_bytes) *read_bytes = io_counter.ReadTransferCount; if(write_bytes) *write_bytes = io_counter.WriteTransferCount; return 0; } return -1; }