如何从Windows应用程序检测禁用的网络接口连接？

Question

我想知道什么时候禁用了一个接口.

如果我进入Windows管理器并禁用其中一个启用的连接,GetIfTable()只返回大约1个接口的状态,它不再看到断开的连接.(返回1表)

如何才能返回已禁用的界面仍然存在但当前已禁用的内容？

谢谢.

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

Answer 1

我想你只需要阅读注册表.

例如,这是在网络上找到的应该是什么样子的片段:

[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

Answer 2

如何使用此示例中netcon.h所示的接口？该示例中的代码以编程方式启用和禁用接口,但我已进行了一些修改,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

另一个选择是使用Win32_NetworkAdapterWMI类,检查NetConnectionStatus和NetEnabled属性.