Windows性能计数器统计网络流量

使用性能计数器的基本步骤是：

1.打开计数器PdhOpenQuery

2.为计数器句柄分配空间

3.把感兴趣的计数器添加进来PdhAddCounter

4.收集数据PdhCollectQueryData

5.得到计数器的数值PdhGetFormattedCounterValue

6.关闭计数器PdhCloseQuery

#include <iostream>#include <Pdh.h>#include <list>#include <string>#include <numeric>#pragma comment(lib, "Pdh.lib")using namespace std; void main(){    list< HCOUNTER> m_counters;    HQUERY m_hQuery;     string counter_list;    string instance_list;    DWORD clistlen = 0;    DWORD ilistlen = 0;     const char * netface = "Network Interface";    const char * in_speed = "Bytes Received/sec";    const char * out_speed = "Bytes Sent/sec";     list< double> m_net_total_in_bps;    list< double> m_net_total_out_bps;     PdhEnumObjectItemsA(0, 0, netface, 0, &clistlen, 0, &ilistlen, PERF_DETAIL_WIZARD, 0);    counter_list.assign(clistlen, 0);    instance_list.assign(ilistlen, 0);    if (ERROR_SUCCESS != PdhEnumObjectItemsA(0, 0, netface, &counter_list[0], &clistlen,        &instance_list[0], &ilistlen, PERF_DETAIL_WIZARD, 0))        return;     PDH_STATUS pdhStatus;    pdhStatus = PdhOpenQuery (0, 0, &m_hQuery);    if ( pdhStatus != ERROR_SUCCESS )        return;     char *tmpsz = &instance_list[0];    // 枚举网卡    for (; *tmpsz!=0; tmpsz+=(strlen(tmpsz)+1))    {        string query_obj_in = string("\\") + netface + "(" + tmpsz + ")" + "\\"             + in_speed;        string query_obj_out = string("\\") + netface + "(" + tmpsz + ")" + "\\"             + out_speed;         HCOUNTER tmpcounter;        pdhStatus = PdhAddCounterA( m_hQuery , query_obj_in.c_str(), 0 , &tmpcounter ) ;        if ( pdhStatus != ERROR_SUCCESS )        {            PdhCloseQuery(m_hQuery) ;            return;        }        m_counters.push_back(tmpcounter);         pdhStatus = PdhAddCounterA(m_hQuery, query_obj_out.c_str(), 0 , &tmpcounter) ;        if (pdhStatus != ERROR_SUCCESS)        {            PdhCloseQuery (m_hQuery) ;            return;        }        m_counters.push_back(tmpcounter);    }     // 统计流量，每秒一次    while(1)    {        PDH_FMT_COUNTERVALUE fmtValue;        DWORD dwctrType;         pdhStatus = PdhCollectQueryData(m_hQuery);        if (pdhStatus != ERROR_SUCCESS)        {            return;        }         double in_bps = 0.0;        double out_bps = 0.0;        double in_avg_bps = 0.0;        double out_avg_bps = 0.0;         // 遍历每块网卡，把流量加起来        for (list< HCOUNTER>::iterator iter = m_counters.begin();            iter != m_counters.end();            iter++)        {            pdhStatus = PdhGetFormattedCounterValue(*iter , PDH_FMT_DOUBLE , &dwctrType,                &fmtValue ) ;            if ( pdhStatus == ERROR_SUCCESS )            {                in_bps += fmtValue.doubleValue;            }            iter ++;            pdhStatus = PdhGetFormattedCounterValue(*iter, PDH_FMT_DOUBLE, &dwctrType,                 &fmtValue ) ;            if ( pdhStatus == ERROR_SUCCESS )            {                out_bps += fmtValue.doubleValue;            }        }         m_net_total_in_bps.push_back(in_bps);        m_net_total_out_bps.push_back(out_bps);        if (m_net_total_in_bps.size() > 10)            m_net_total_in_bps.pop_front();        if (m_net_total_out_bps.size() > 10)            m_net_total_out_bps.pop_front();        in_avg_bps = accumulate(m_net_total_in_bps.begin(), m_net_total_in_bps.end(), 0.0)            / m_net_total_in_bps.size();        out_avg_bps = accumulate(m_net_total_out_bps.begin(), m_net_total_out_bps.end(),            0.0) / m_net_total_out_bps.size();         cout << "IN  = " << in_avg_bps/1024 << "KBps" << endl;        cout << "OUT = " << out_avg_bps/1024 << "KBps" << endl;         Sleep(1000);    }}

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