建网站做联盟,机械加工怎样网上接单,关联网站有那些,百度地图网站后台更新例子#xff1a;
PID0#xff0c;缺省为当前进程#xff0c;但最好是获取当前进程ID传递进去#xff0c;当然也可以选择其它进程的ID。 PerformanceCounter pc;
pc.Open(0, //Processor(_Total)//% Processor Time); 源实现#xff1a;
#include windo…例子
PID0缺省为当前进程但最好是获取当前进程ID传递进去当然也可以选择其它进程的ID。 PerformanceCounter pc;
pc.Open(0, //Processor(_Total)//% Processor Time); 源实现
#include windows.h
#include pdh.hclass PerformanceCounter{public:PerformanceCounter() noexcept;virtual ~PerformanceCounter() noexcept;public:virtual double Next() noexcept;virtual void Open(int pid, LPCSTR counter);virtual void Dispose() noexcept;private:void Release() noexcept;private:std::atomicvoid* m_phQuery NULL;std::atomicvoid* m_phCounter NULL;};PerformanceCounter::PerformanceCounter() noexcept: m_phQuery(NULL), m_phCounter(NULL){}PerformanceCounter::~PerformanceCounter() noexcept{Release();}void PerformanceCounter::Open(int pid, LPCSTR counter){void* phQuery NULL;if (PdhOpenQueryA(NULL, pid, phQuery) ! ERROR_SUCCESS){throw std::exception(The handle to the PerformanceCounter could not be opened.);}void* phCounter NULL;if (PdhAddCounterA(phQuery, counter, 0, phCounter) ! ERROR_SUCCESS){PdhCloseQuery(phCounter);throw std::exception(Unable to add a performance counter instance.);}else{Release();}m_phQuery.exchange(phQuery);m_phCounter.exchange(phCounter);}double PerformanceCounter::Next() noexcept{if (m_phQuery NULL){return 0;}else{PdhCollectQueryData(m_phQuery);}PDH_FMT_COUNTERVALUE counterValue;if (PdhGetFormattedCounterValue(m_phCounter, PDH_FMT_DOUBLE, NULL, counterValue) ERROR_SUCCESS){return counterValue.doubleValue;}return 0;}void PerformanceCounter::Dispose() noexcept{Release();}void PerformanceCounter::Release() noexcept{void* phCounter m_phCounter.exchange(NULL);if (NULL ! phCounter){PdhRemoveCounter(phCounter);}void* phQuery m_phQuery.exchange(NULL);if (phQuery ! NULL){PdhCloseQuery(phQuery);}}
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