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Retrieve the number of bytes sent/received (and other useful infos) for any network adapterBy Massimiliano ConteUsing Iphlpapi.dll to retrieve network adapters info |
VC6Win2K, MFC, Dev
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This sample snippet shows how to retrieve the list of all network adapters on your machine, plus a lot of infos about each of them. The information you can retrieve are all the members of the structure MIB_IFROW as shown in this MSDN snippet
typedef struct _MIB_IFROW { WCHAR wszName[MAX_INTERFACE_NAME_LEN]; DWORD dwIndex; // index of the interface DWORD dwType; // type of interface DWORD dwMtu; // max transmission unit DWORD dwSpeed; // speed of the interface DWORD dwPhysAddrLen; // length of physical address BYTE bPhysAddr[MAXLEN_PHYSADDR]; // physical address of adapter DWORD dwAdminStatus; // administrative status DWORD dwOperStatus; // operational status DWORD dwLastChange; // last time operational status changed DWORD dwInOctets; // octets received DWORD dwInUcastPkts; // unicast packets received DWORD dwInNUcastPkts; // non-unicast packets received DWORD dwInDiscards; // received packets discarded DWORD dwInErrors; // erroneous packets received DWORD dwInUnknownProtos; // unknown protocol packets received DWORD dwOutOctets; // octets sent DWORD dwOutUcastPkts; // unicast packets sent DWORD dwOutNUcastPkts; // non-unicast packets sent DWORD dwOutDiscards; // outgoing packets discarded DWORD dwOutErrors; // erroneous packets sent DWORD dwOutQLen; // output queue length DWORD dwDescrLen; // length of bDescr member BYTE bDescr[MAXLEN_IFDESCR]; // interface description } MIB_IFROW,*PMIB_IFROW;After wasted lot of time trying to reach the performance counter stuff I found this DLL. And now you can use it without having to look around anymore :)
In my working environment I don't have the right headers and libs to include in the project, so I used the functions inside the DLL using the LoadLibrary and GetProcAddress, like this:
typedef DWORD (_stdcall *TGetIfTable) ( MIB_IFTABLE *pIfTable, // buffer for interface table ULONG *pdwSize, // size of buffer BOOL bOrder // sort the table by index? ); ... TGetIfTable pGetIfTable; ... // not so safe here... pGetIfTable=(TGetIfTable)GetProcAddress(LoadLibrary("Iphlpapi.dll"), "GetIfTable"); /* always remember to test the result of LoadLibrary and GetProcAddress against null return values... */
The key function of the DLL is GetIfTable. You have to call this function twice, first time to know how much memory space allocate, and then to fill the structure with the return values. In the OnInitDialog I get the right size of the adapters-table and I can fill the combo box with all the adapters descriptions
... m_pTable=NULL; m_dwAdapters=0; ULONG uRetCode=pGetIfTable(m_pTable,&m_dwAdapters,TRUE); if (uRetCode == 122 /* The data area passed to a system call is too small.*/) { // now we know how much memory allocate m_pTable=new MIB_IFTABLE[m_dwAdapters]; pGetIfTable(m_pTable,&m_dwAdapters,TRUE); for (UINT i=0;i<m_pTable->dwNumEntries;i++) { MIB_IFROW Row=m_pTable->table[i]; char szDescr[MAXLEN_IFDESCR]; memcpy(szDescr,Row.bDescr,Row.dwDescrLen); szDescr[Row.dwDescrLen]=0; m_ctlCBAdapters.AddString(szDescr); } } ...
if everything has gone right a timer starts, and the UpdateCounters get called every 100ms
void CP01Dlg::UpdateCounters() { int nIndex=m_ctlCBAdapters.GetCurSel(); if (nIndex!=CB_ERR) { pGetIfTable(m_pTable,&m_dwAdapters,TRUE); MIB_IFROW Row=m_pTable->table[nIndex]; m_strInfo.Format("Received %d, Sent %d",Row.dwInOctets, Row.dwOutOctets); UpdateData(FALSE); } }
I hope this snippet can save you some time. See you in my next article.
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Last Updated: 29 Oct 2003 Editor: Nishant Sivakumar |
Copyright 2003 by Massimiliano Conte Everything else Copyright © CodeProject, 1999-2009 Web12 | Advertise on the Code Project |
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