Windows CPU、内存、磁盘、使用率计算
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编译环境：
- Visual Studio 2017
- gcc version 4.8.3 (GCC) (使用c99标准：-std=c99)
调用Win32 API：
cpu使用率：
C代码：
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <Windows.h>
typedef unsigned long long uint64;
void perrno(const char *info)
{
printf("%s errno: %d\n", info, GetLastError());
exit(EXIT_FAILURE);
}
uint64 CompareFileTime2(FILETIME * lpFileTime1, FILETIME * lpFileTime2)
{
return ((uint64)lpFileTime2->dwHighDateTime << 32 | lpFileTime2->dwLowDateTime) - ((uint64)lpFileTime1->dwHighDateTime << 32 | lpFileTime1->dwLowDateTime);
}
int GetCpuUsage(uint64 *used, uint64 *total, uint64 *percent)
{
if (used == NULL || total == NULL || percent == NULL)
return -1;
FILETIME idle_1, kernel_1, user_1, idle_2, kernel_2, user_2;
uint64 idle, kernel, user;
if (!GetSystemTimes(&idle_1, &kernel_1, &user_1))
perrno("GetSystemTimes");
Sleep(1000);
if (!GetSystemTimes(&idle_2, &kernel_2, &user_2))
perrno("GetSystemTimes");
idle = CompareFileTime2(&idle_1, &idle_2);
user = CompareFileTime2(&user_1, &user_2);
kernel = CompareFileTime2(&kernel_1, &kernel_2);
*total = kernel + user;
if (*total == 0)
*total = 1;
*used = *total - idle;
*percent = *used * 100 / *total;
return 0;
}
int main()
{
uint64 used, total, percent;
for (size_t i = 0; i < 10; i++)
{
if (GetCpuUsage(&used, &total, &percent))
printf("GetCpuUsage");
fprintf(stdout, "percent:%lld\n", percent);
}
system("pause");
return EXIT_SUCCESS;
}
memory使用率
C代码：
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <Windows.h>
typedef unsigned long long uint64;
void perrno(const char *info)
{
printf("%s errno: %d\n", info, GetLastError());
exit(EXIT_FAILURE);
}
int GetMemoryUsage(uint64 *used, uint64 *total, uint64 *percent)
{
if (used == NULL || total == NULL || percent == NULL)
return -1;
MEMORYSTATUSEX state;
state.dwLength = sizeof(state);
if (!GlobalMemoryStatusEx(&state))
perrno("GlobalMemoryStatusEx");
*used = state.ullTotalPhys - state.ullAvailPhys;
*total = state.ullTotalPhys;
*percent = state.dwMemoryLoad;
return 0;
}
int main()
{
uint64 used, total, percent;
for (size_t i = 0; i < 10; i++)
{
if (GetMemoryUsage(&used, &total, &percent))
printf("GetMemoryUsage");
fprintf(stdout, "percent:%lld\n", percent);
Sleep(1000);
}
system("pause");
return EXIT_SUCCESS;
}
disk使用率(非IO使用率)
C代码
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <Windows.h>
typedef unsigned long long uint64;
void perrno(const char *info)
{
printf("%s errno: %d\n", info, GetLastError());
exit(EXIT_FAILURE);
}
int GetDiskUsage(uint64 *used, uint64 *total, uint64 *percent)
{
if (used == NULL || total == NULL || percent == NULL)
return -1;
char buf[MAX_PATH] = { 0 };
DWORD ret = GetLogicalDriveStringsA(MAX_PATH - 1, buf);
if (ret < 0)
return -1;
ULARGE_INTEGER qwFreeBytesToCaller, qwTotalBytes, qwFreeBytes;
for (size_t i = 0; i < ret; i+=strlen(buf) + 1)
{
if (!GetDiskFreeSpaceExA(buf + i, &qwFreeBytesToCaller, &qwTotalBytes, &qwFreeBytes))
return -1;
*total += qwTotalBytes.QuadPart;
*used += qwTotalBytes.QuadPart - qwFreeBytes.QuadPart;
}
if (*total == 0)
*total = 1;
*percent = *used * 100 / *total;
return 0;
}
int main()
{
uint64 used = 0, total = 0, percent = 0;
for (size_t i = 0; i < 10; i++)
{
if (GetDiskUsage(&used, &total, &percent))
perrno("GetDiskUsage");
fprintf(stdout, "percent:%llu\n", percent);
Sleep(1000);
}
system("pause");
return EXIT_SUCCESS;
}
