如何从 Windows 应用程序检测禁用的网络接口连接？

Question

我想知道某个接口何时被禁用。

如果我进入 Windows 管理器并禁用 2 个启用的连接之一，GetIfTable() 只返回关于 1 个接口的状态，它不再看到断开的接口。 （返回 1 个表）

我如何才能返回已禁用的接口仍然存在但当前已禁用？

谢谢。

http://msdn.microsoft.com/en-us/library/aa365943%28VS.85%29.aspx

Answer 1

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                                       PCI\VEN_14E4&DEV_4320&SUBSYS_041814E4&REV_03\4&31B6CD7&0&00F0
1394 Net Adapter                       13     1394                                       V1394\NIC1394\1B9E0F31E8C00
TAP-Win32 Adapter V9                   14     Steganos Internet Anonym 2012 VPN Adapter  ROOT\NET\0000
VirtualBox Host-Only Ethernet Adapter  24     VirtualBox Host-Only Network               ROOT\NET\0001

Answer 2

如何使用netcon.h 中的接口，如this example 所示？该示例中的代码以编程方式启用和禁用接口，但我进行了一些修改，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; 
}

Answer 3

根据this CodeGuru forum message，您可以查询 WMI 以获取此信息（那里提供了 C# 代码）。

要使用 C++ 查询 WMI，请参阅以下两个链接：

• MSDN
• CodeProject

Answer 4

另一个选项是使用 Win32_NetworkAdapter WMI 类，检查 NetConnectionStatus 和 NetEnabled 属性。

Answer 5

IP_ADAPTER_ADDRESSES 结构包含一个 OperStatus 成员。 见MSDN documentation

我认为它可以用来检测禁用的网卡。我没试过。

这是一个测试代码：

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;
}

Answer 6

我认为您只需要阅读注册表即可。

例如，这是在网上找到的一个 sn-p，它应该是什么样子的：

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Network\{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_MACHINE\SYSTEM\CurrentControlSet\Control\Network\{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