Windows下用C语言获取进程cpu使用率,内存使用,IO情况

 

#ifndef PROCESS_STAT_H

#define PROCESS_STAT_H

 

#ifdef __cplusplus

extern “C” {

#endif

 

typedef long long int64_t;

typedef unsigned long long uint64_t;

 

/// 获取当前进程的cpu使用率，返回-1失败

int get_cpu_usage();

 

/// 获取当前进程内存和虚拟内存使用量，返回-1失败，0成功

int get_memory_usage(uint64_t* mem, uint64_t* vmem);

 

/// 获取当前进程总共读和写的IO字节数，返回-1失败，0成功

int get_io_bytes(uint64_t* read_bytes, uint64_t* write_bytes);

 

#ifdef __cplusplus

}

#endif

 

#endif/*PROCESS_STAT_H*/

 

/**

* 需要连接到psapi.lib

*/

 

#include

#include #include

#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;

}

 

#include “process_stat.h”

#include

#include

 

int main()

{

while(1)

{

int cpu;

uint64_t mem, vmem, r, w;

 

cpu = get_cpu_usage();

get_memory_usage(&mem, &vmem);

get_io_bytes(&r, &w);

 

printf(“CPU使用率: %u\n”,cpu);

printf(“内存使用: %u 字节\n”, mem);

printf(“虚拟内存使用: %u 字节\n”, vmem);

printf(“总共读: %u 字节\n”, r);

printf(“总共写: %u 字节\n”, w);

 

Sleep(1000);

}

return 0;

}