本文介绍了检索Mac OS X上的系统信息的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
使用C++,是否有方法可以获取有关计算机的基本信息?
例如,有没有一种方法可以检查(整个计算机而不仅仅是我的计算机)使用了多少内存、可用内存总量、虚拟内存使用率、CPU使用率、网络统计数据等等?
我使用的是Mac OS X v10.6(Snow To Leopard),但我更喜欢可以实现所有Mac OS的解决方案(例如,Mac OS X v10.7(Lion))。
推荐答案
有关Mac OS Windows X下系统范围的内存使用信息,请打开并阅读文件/usr/bin/vm_stat。大概是这样的:
static double ParseMemValue(const char * b)
{
while((*b)&&(isdigit(*b) == false))
b++;
return isdigit(*b) ? atof(b) : -1.0;
}
// Returns a number between 0.0f and 1.0f, with 0.0f meaning all RAM is available, and 1.0f meaning all RAM is currently in use
float GetSystemMemoryUsagePercentage()
{
FILE * fpIn = popen("/usr/bin/vm_stat", "r");
if (fpIn)
{
double pagesUsed = 0.0, totalPages = 0.0;
char buf[512];
while(fgets(buf, sizeof(buf), fpIn) != NULL)
{
if (strncmp(buf, "Pages", 5) == 0)
{
double val = ParseMemValue(buf);
if (val >= 0.0)
{
if ((strncmp(buf, "Pages wired", 11) == 0) ||
(strncmp(buf, "Pages active", 12) == 0)
)
pagesUsed += val;
totalPages += val;
}
}
else
if (strncmp(buf, "Mach Virtual Memory Statistics", 30) != 0)
break; // Stop at "Translation Faults". We don't care
// about anything at or below that
}
pclose(fpIn);
if (totalPages > 0.0)
return (float) (pagesUsed/totalPages);
}
return -1.0f; // Indicate failure
}
对于CPU使用率指示器,请执行以下操作:
#include <mach/mach_init.h>
#include <mach/mach_error.h>
#include <mach/mach_host.h>
#include <mach/vm_map.h>
static unsigned long long _previousTotalTicks = 0;
static unsigned long long _previousIdleTicks = 0;
// Returns 1.0f for "CPU fully pinned", 0.0f for "CPU idle", or somewhere in between
// You'll need to call this at regular intervals, since it measures the load between
// the previous call and the current one.
float GetCPULoad()
{
host_cpu_load_info_data_t cpuinfo;
mach_msg_type_number_t count = HOST_CPU_LOAD_INFO_COUNT;
if (host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO, (host_info_t)&cpuinfo, &count) == KERN_SUCCESS)
{
unsigned long long totalTicks = 0;
for(int i=0; i<CPU_STATE_MAX; i++)
totalTicks += cpuinfo.cpu_ticks[i];
return CalculateCPULoad(cpuinfo.cpu_ticks[CPU_STATE_IDLE], totalTicks);
}
else
return -1.0f;
}
float CalculateCPULoad(unsigned long long idleTicks, unsigned long long totalTicks)
{
unsigned long long totalTicksSinceLastTime = totalTicks-_previousTotalTicks;
unsigned long long idleTicksSinceLastTime = idleTicks-_previousIdleTicks;
float ret = 1.0f-((totalTicksSinceLastTime > 0) ? ((float)idleTicksSinceLastTime)/totalTicksSinceLastTime : 0);
_previousTotalTicks = totalTicks;
_previousIdleTicks = idleTicks;
return ret;
}
对于网络统计,我不知道解决方案(除了可能运行netstat并以某种方式解析结果...我想这取决于您对什么网络统计数据感兴趣)。
这篇关于检索Mac OS X上的系统信息的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持编程学习网!
本站部分内容来源互联网,如果有图片或者内容侵犯您的权益请联系我们删除!