windows获取系统网络流量
函数
DWORD GetIfTable(
PMIB_IFTABLE pIfTable,
PULONG pdwSize,
BOOL bOrder
);
功能
获取MIB-II接口列表
参数
PMIB_IFTABLE pIfTable：接收缓冲区，接收GetIfTable返回的MIB-II接口表
PULONG pdwSize：pIfTable缓冲区字节数，若缓冲区过小则返回所需大小
BOOL bOrder：指定pIfTable中返回的接口列表条目是否根据接口索引排序
MIB_IFTABLE结构体
typedef struct _MIB_IFTABLE {
DWORD dwNumEntries;
MIB_IFROW table[ANY_SIZE];
} MIB_IFTABLE, *PMIB_IFTABLE;
typedef struct _MIB_IFROW {
WCHAR wszName[MAX_INTERFACE_NAME_LEN];
DWORD dwIndex;
DWORD dwType;
DWORD dwMtu;
DWORD dwSpeed;
DWORD dwPhysAddrLen;
BYTE bPhysAddr[MAXLEN_PHYSADDR];
DWORD dwAdminStatus;
DWORD dwOperStatus;
DWORD dwLastChange;
DWORD dwInOctets;
DWORD dwInUcastPkts;
DWORD dwInNUcastPkts;
DWORD dwInDiscards;
DWORD dwInErrors;
DWORD dwInUnknownProtos;
DWORD dwOutOctets;
DWORD dwOutUcastPkts;
DWORD dwOutNUcastPkts;
DWORD dwOutDiscards;
DWORD dwOutErrors;
DWORD dwOutQLen;
DWORD dwDescrLen;
BYTE bDescr[MAXLEN_IFDESCR];
} MIB_IFROW, *PMIB_IFROW;http://msdn.microsoft.com/en-us/library/windows/desktop/aa366836(v=vs.85).aspx
返回值
成功返回NO_ERROR，否则返回值即错误码
头文件和引用库
#include <IPHlpApi.h>
#pragma comment(lib, "IPHlpApi.lib")
使用方法
/*获取MIB-II接口表大小*/
DWORD dwBufferLen = 0;
GetIfTable(NULL, &dwBufferLen, 0);
/*创建MIB-II接口表*/
PMIB_IFTABLE pMibIfTable = (MIB_IFTABLE*)malloc(dwBufferLen);
/*获取MIB-II接口表*/
DWORD dwRet = GetIfTable(pMibIfTable, &dwBufferLen, 0);
if(NO_ERROR != dwRet)
{
std::cout<<"GetIfTable != NO_ERROR, ErrorCode="<<dwRet<<std::endl;
free(pMibIfTable);
return false;
}细说MIB_IFROW结构体成员
dwType：接口类型，例如IF_TYPE_ETHERNET_CSMACD=6, Ethernet网络接口；IF_TYPE_SOFTWARE_LOOPBACK=24，软件回环测试网络接口。23号之前的网络接口可用来统计系统流量。
dwSpeed：接口速度，单位bps，可用来计算网络带宽
bPhysAddr：接口网卡的MAC地址
dwInOctets：接收的字节数，自系统启动，可用来统计系统网络流量。
dwOutOctets：发送的字节数，自系统启动，可用来统计系统网络流量。
获取网络带宽
bool GetNetworkBandwithByMidTable(int &iMbsBandwidth)
{
/*获取MIB-II接口表大小*/
DWORD dwBufferLen = 0;
GetIfTable(NULL, &dwBufferLen, 0);
/*创建MIB-II接口表*/
PMIB_IFTABLE pMibIfTable = (MIB_IFTABLE*)malloc(dwBufferLen);
/*获取MIB-II接口表*/
DWORD dwRet = GetIfTable(pMibIfTable, &dwBufferLen, 0);
if(NO_ERROR != dwRet)
{
std::cout<<"GetIfTable != NO_ERROR, ErrorCode="<<dwRet<<std::endl;
free(pMibIfTable);
return false;
}
iMbsBandwidth = INT_MAX;
/*多网卡*/
for(int i = 0; i != pMibIfTable->dwNumEntries; ++i)
{
if (pMibIfTable->table[i].dwType <= 23)
{
int iTmp = static_cast<int>(pMibIfTable->table[i].dwSpeed/1000/1000);
if(iTmp != 0 && iTmp < iMbsBandwidth)
iMbsBandwidth = iTmp;
}
}
free(pMibIfTable);
if(iMbsBandwidth == INT_MAX)
return false;
return true;
}
网卡的传输速度有10Mbps、100Mbps、1000Mbps，查看网卡速度的方法：设备管理器—网络适配器—选择网卡—属性—高级—连接速度和双工模式—值—下拉菜单中的最大值。
网络带宽由多种因素决定，例如为连接在只具备100M传输速度的双绞线上的计算机配置1000M的网卡就是一种浪费，因为其至多也只能实现100M的传输速率。
故网络带宽为各种物理介质中的最小值，可认为是所有网卡传输速度的最小值（且不为0）。
获取发送比特数和接收比特数，自系统启动
bool GetStatisticOfSysNetworkFlow(DWORD &dwbitTotalRecv, DWORD &dwbitTotalSend)
{
/*获取MIB-II接口表大小*/
DWORD dwBufferLen = 0;
GetIfTable(NULL, &dwBufferLen, 0);
/*创建MIB-II接口表*/
PMIB_IFTABLE pMibIfTable = (MIB_IFTABLE*)malloc(dwBufferLen);
/*获取MIB-II接口表*/
DWORD dwRet = GetIfTable(pMibIfTable, &dwBufferLen, 0);
if(NO_ERROR != dwRet)
{
std::cout<<"GetIfTable != NO_ERROR, ErrorCode="<<dwRet<<std::endl;
free(pMibIfTable);
return false;
}
dwbitTotalRecv = dwbitTotalSend = 0;
/*多网卡*/
for(int i = 0; i != pMibIfTable->dwNumEntries; ++i)
{
if (pMibIfTable->table[i].dwType <= 23)
{
dwbitTotalRecv += pMibIfTable->table[i].dwInOctets;
dwbitTotalSend += pMibIfTable->table[i].dwOutOctets;
}
}
/*Byte转bit*/
dwbitTotalRecv *= 8;
dwbitTotalSend *= 8;
free(pMibIfTable);
return true;
}计算每秒发送比特数和每秒接收比特数
bool GetSysNetworkFlowByMidTable(DWORD &dwbpsRecv, DWORD &dwbpsSend)
{
/*首次获取*/
DWORD dwTotalRecv1 = 0, dwTotalSend1 = 0;
if(!GetStatisticOfSysNetworkFlow(dwTotalRecv1, dwTotalSend1))
{
printf("GetStatisticOfSysNetworkFlow == false\n");
return false;
}
Sleep(1000);
/*再取*/
DWORD dwTotalRecv2 = 0, dwTotalSend2 = 0;
if(!GetStatisticOfSysNetworkFlow(dwTotalRecv2, dwTotalSend2))
{
printf("GetStatisticOfSysNetworkFlow == false\n");
return false;
}
/*计算*/
dwbpsRecv = dwTotalRecv2 - dwTotalRecv1;
dwbpsSend = dwTotalSend2 - dwTotalSend1;
return true;
}
注：Windows Performance Counter性能计数器的Network Interface对象能够获取系统网络数据，经验证在Win7下Performance Counter可能不存在Network Interface对象，导致程序运行失败。
