我想知道一个接口何时被禁用。
如果我进入windows管理器并禁用2个启用的连接中的一个,GetIfTable()只返回关于1个接口的状态,它不再看到断开连接的接口。(返回一个表)
我怎样才能得到一些东西来返回禁用的接口仍然存在,但当前禁用?
谢谢。http://msdn.microsoft.com/en-us/library/aa365943%28VS.85%29.aspx
我想你只需要阅读注册表。
例如,这是一个在网上找到的东西应该是什么样子的片段:
[HKEY_LOCAL_MACHINESYSTEMControlSet001ControlNetwork{4D36E972-E325-11CE-BFC1-08002BE10318}{1E6AF554-25FF-40FC-9CEE-EB899472C5A3}Connection]
"PnpInstanceID"="PCI\VEN_14E4&DEV_1696&SUBSYS_12BC103C&REV_03\4&3A321F38&0&10F0"
"MediaSubType"=dword:00000001
"Name"="Lan Name"
"ShowIcon"=dword:00000000
"IpCheckingEnabled"=dword:00000001
[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlNetwork{4D36E972-E325-11CE-BFC1-08002BE10318}{1E6AF554-25FF-40FC-9CEE-EB899472C5A3}Connection]
"PnpInstanceID"="PCI\VEN_14E4&DEV_1696&SUBSYS_12BC103C&REV_03\4&3A321F38&0&10F0"
"MediaSubType"=dword:00000001
"Name"="Lan Name"
"ShowIcon"=dword:00000000
"IpCheckingEnabled"=dword:00000001
使用本例中所示的netcon.h
的接口如何?该示例中的代码以编程方式启用和禁用接口,但我做了一些修改,以便您可以查询状态:
#include <netcon.h>
// wszName is the name of the connection as appears in Network Connections folder
// set bEnable to true to enable and to false to disable
bool GetConnectionStatus(LPCWSTR wszName, bool *status)
{
bool result = false;
if (!status)
return false;
typedef void (__stdcall * LPNcFreeNetconProperties)(NETCON_PROPERTIES* pProps);
HMODULE hmod = LoadLibrary("netshell.dll");
if (!hmod)
return false;
LPNcFreeNetconProperties NcFreeNetconProperties =
(LPNcFreeNetconProperties)GetProcAddress(hmod, "NcFreeNetconProperties");
if (!NcFreeNetconProperties )
return false;
INetConnectionManager * pMan = 0;
HRESULT hres = CoCreateInstance(CLSID_ConnectionManager,
0,
CLSCTX_ALL,
__uuidof(INetConnectionManager),
(void**)&pMan);
if (SUCCEEDED(hres))
{
IEnumNetConnection * pEnum = 0;
hres = pMan->EnumConnections(NCME_DEFAULT, &pEnum);
if (SUCCEEDED(hres))
{
INetConnection * pCon = 0;
ULONG count;
while (pEnum->Next(1, &pCon, &count) == S_OK && !done)
{
NETCON_PROPERTIES * pProps = 0;
hres = pCon->GetProperties(&pProps);
if (SUCCEEDED(hres))
{
if (wcscmp(pProps->pszwName,wszName) == 0)
{
*status = pProps->Status == NCS_CONNECTED;
}
NcFreeNetconProperties(pProps);
}
pCon->Release();
}
pEnum->Release();
}
pMan->Release();
}
FreeLibrary(hmod);
return result;
}
另一种选择是使用Win32_NetworkAdapter
WMI类,检查NetConnectionStatus
和NetEnabled
属性
IP_ADAPTER_ADDRESSES结构包含一个OperStatus成员。参见MSDN文档
我认为它可以用来检测禁用的网卡。我没试过。
下面是测试代码:
ULONG nFlags= 0;
if (WINVER>=0x0600) // flag supported in Vista and later
nFlags= 0x0100; // GAA_FLAG_INCLUDE_ALL_INTERFACES
// during system initialization, GetAdaptersAddresses may return ERROR_BUFFER_OVERFLOW and supply nLen,
// but in a subsequent call it may return ERROR_BUFFER_OVERFLOW and supply greater nLen !
ULONG nLen= sizeof (IP_ADAPTER_ADDRESSES);
BYTE* pBuf= NULL;
DWORD nErr= 0 ;
do
{
delete[] pBuf;
pBuf= new BYTE[nLen];
nErr= ::GetAdaptersAddresses(AF_INET, nFlags, NULL, (IP_ADAPTER_ADDRESSES*&)pBuf, &nLen);
}
while (ERROR_BUFFER_OVERFLOW == nErr);
if (NO_ERROR != nErr)
{
delete[] pBuf;
TCHAR czErr[300]= _T("GetAdaptersAddresses failed. ");
REPORT(REP_ERROR, _T("GetAdapterInfo"), GetSysErrStr(nErr, czErr, 300));
return false;
}
const IP_ADAPTER_ADDRESSES* pAdaptersAddresses= (IP_ADAPTER_ADDRESSES*&)pBuf;
while (pAdaptersAddresses) // for each adapter
{
TCHAR czAdapterName [500]; str_cpy(czAdapterName , 500, pAdaptersAddresses->AdapterName );
TCHAR czDesc [500]; str_cpy(czDesc , 500, pAdaptersAddresses->Description );
TCHAR czFriendlyName[500]; str_cpy(czFriendlyName, 500, pAdaptersAddresses->FriendlyName);
const IF_OPER_STATUS& Stat= pAdaptersAddresses->OperStatus; // 1:up, 2:down...
...
pAdaptersAddresses= pAdaptersAddresses->Next;
}
根据这个CodeGuru论坛消息,您可以向WMI查询这些信息(那里提供了c#代码)。
使用c++查询WMI,请参见以下两个链接:
- MSDN
- CodeProject上
命令行:
wmic NIC where(ConfigManagerErrorCode=22)get Description,Index,NetConnectionID,PNPDeviceID
输出:Description Index NetConnectionID PNPDeviceID
Broadcom 802.11g Network Adapter 8 WiFi PCIVEN_14E4&DEV_4320&SUBSYS_041814E4&REV_034&31B6CD7&0&00F0
1394 Net Adapter 13 1394 V1394NIC13941B9E0F31E8C00
TAP-Win32 Adapter V9 14 Steganos Internet Anonym 2012 VPN Adapter ROOTNET 000
VirtualBox Host-Only Ethernet Adapter 24 VirtualBox Host-Only Network ROOTNET 001