以前看過linux下擷取記憶體使用率及cpu使用率的方法，寫的多少有點亂，改善了一下，運作程式可以直接獲得記憶體使用率及cpu使用率,需求比較急的話，可以直接運作代碼，獲得結果
#include #include
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typedef struct PACKED //定義一個cpu occupy的結構體
{
char name[20]; //定義一個char類型的數組名name有20個元素
unsigned int user; //定義一個無符号的int類型的user
unsigned int nice; //定義一個無符号的int類型的nice
unsigned int system;//定義一個無符号的int類型的system
unsigned int idle; //定義一個無符号的int類型的idle
}CPU_OCCUPY;
typedef struct PACKED1 //定義一個mem occupy的結構體
{
char name[20]; //定義一個char類型的數組名name有20個元素
unsigned long total;
char name2[20];
unsigned long free;
}MEM_OCCUPY;
get_memoccupy (MEM_OCCUPY *mem) //對無類型get函數含有一個形參結構體類弄的指針O
{
FILE *fd;
int n;
char buff[256];
char buff1[256];
char buff2[256];
char buff3[256];
char buff4[256];
MEM_OCCUPY *m;
m=mem;
float mem_use;
fd = fopen ("/proc/meminfo", "r");
fgets (buff1, sizeof(buff1), fd);
printf("%s\n",buff1);
int num1 = atoi(buff1+15);
printf("%d\n",num1);
fgets (buff2, sizeof(buff2), fd);
printf("%s\n",buff2);
int num2 = atoi(buff2+15);
fgets (buff3, sizeof(buff3), fd);
printf("%s\n",buff3);
int num3 = atoi(buff3+15);
fgets (buff4, sizeof(buff4), fd);
// sscanf (buff, "%s %u %s", m->name, &m->total, m->name2);
printf("%s\n",buff4);
int num4 = atoi(buff4+15);
fgets (buff, sizeof(buff), fd); //從fd檔案中讀取長度為buff的字元串再存到起始位址為buff這個空間裡
// sscanf (buff, "%s %u", m->name2, &m->free, m->name2);
// sscanf (buff, "%s %u", m->name2, &m->free);
printf("%s\n",buff);
// 記憶體使用率(MEMUsedPerc)=100*(MemTotal-MemFree-Buffers-Cached)/MemTotal
mem_use = (float)100*(num1-num2-num3-num4)/num1;
printf("記憶體使用率為：%.2f%%\n",mem_use);
fclose(fd); //關閉檔案fd
}
float cal_cpuoccupy (CPU_OCCUPY *o, CPU_OCCUPY *n) { unsigned long od, nd; unsigned long id, sd; float cpu_use = 0; od = (unsigned long) (o->user + o->nice + o->system +o->idle);//第一次(使用者+優先級+系統+空閑)的時間再賦給od nd = (unsigned long) (n->user + n->nice + n->system +n->idle);//第二次(使用者+優先級+系統+空閑)的時間再賦給od id = (unsigned long) (n->user - o->user); //使用者第一次和第二次的時間之差再賦給id sd = (unsigned long) (n->system - o->system);//系統第一次和第二次的時間之差再賦給sd if((nd-od) != 0) cpu_use = (float)((sd+id)*100)/(nd-od); //((使用者+系統)乖100)除(第一次和第二次的時間差)再賦給g_cpu_used else cpu_use = 0; printf("cpu使用率為：%1.2f%%",cpu_use); return cpu_use; } get_cpuoccupy (CPU_OCCUPY *cpust) //對無類型get函數含有一個形參結構體類弄的指針O { FILE *fd; int n; char buff[256]; CPU_OCCUPY *cpu_occupy; cpu_occupy=cpust; fd = fopen ("/proc/stat", "r"); fgets (buff, sizeof(buff), fd); sscanf (buff, "%s %u %u %u %u", cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice,&cpu_occupy->system, &cpu_occupy->idle); fclose(fd); } int main() { CPU_OCCUPY cpu_stat1; CPU_OCCUPY cpu_stat2; MEM_OCCUPY mem_stat; float cpu; //擷取記憶體 get_memoccupy ((MEM_OCCUPY *)&mem_stat); //第一次擷取cpu使用情況 get_cpuoccupy((CPU_OCCUPY *)&cpu_stat1); sleep(10); //第二次擷取cpu使用情況 get_cpuoccupy((CPU_OCCUPY *)&cpu_stat2); //計算cpu使用率 cpu = cal_cpuoccupy ((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2); return 0; }