依托OCX控件获取网卡mac地址

在Windows平台上，获取网卡MAC地址可以通过使用WMI（Windows Management Instrumentation）或API函数来实现。其中，使用API函数要求较高，而使用WMI则相对简单。以下是使用WMI获取网卡MAC地址的示例代码（C++）：

#include <iostream>
#include <comdef.h>
#include <Wbemidl.h>

#pragma comment(lib, "wbemuuid.lib")

int main()
{
    HRESULT hres;

    // 初始化COM库
    hres = CoInitializeEx(0, COINIT_MULTITHREADED);
    if (FAILED(hres))
    {
        std::cerr << "Failed to initialize COM library" << std::endl;
        return 1;
    }

    // 设置安全级别
    hres = CoInitializeSecurity(
        NULL,
        -1,
        NULL,
        NULL,
        RPC_C_AUTHN_LEVEL_DEFAULT,
        RPC_C_IMP_LEVEL_IMPERSONATE,
        NULL,
        EOAC_NONE,
        NULL
    );
    if (FAILED(hres))
    {
        std::cerr << "Failed to initialize security" << std::endl;
        CoUninitialize();
        return 1;
    }

    // 获取WMI服务
    IWbemLocator* pLoc = NULL;
    hres = CoCreateInstance(
        CLSID_WbemLocator,
        0,
        CLSCTX_INPROC_SERVER,
        IID_IWbemLocator,
        (LPVOID*)&pLoc
    );
    if (FAILED(hres))
    {
        std::cerr << "Failed to create IWbemLocator object" << std::endl;
        CoUninitialize();
        return 1;
    }

    IWbemServices* pSvc = NULL;
    hres = pLoc->ConnectServer(
        _bstr_t(L"ROOT\\CIMV2"),
        NULL,
        NULL,
        0,
        NULL,
        0,
        0,
        &pSvc
    );
    if (FAILED(hres))
    {
        std::cerr << "Failed to connect to IWbemServices object" << std::endl;
        pLoc->Release();
        CoUninitialize();
        return 1;
    }

    // 设置WMI服务的安全级别
    hres = CoSetProxyBlanket(
        pSvc,
        RPC_C_AUTHN_WINNT,
        RPC_C_AUTHZ_NONE,
        NULL,
        RPC_C_AUTHN_LEVEL_CALL,
        RPC_C_IMP_LEVEL_IMPERSONATE,
        NULL,
        EOAC_NONE
    );
    if (FAILED(hres))
    {
        std::cerr << "Failed to set security on IWbemServices object" << std::endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;
    }

    // 查询网卡信息
    IEnumWbemClassObject* pEnumerator = NULL;
    hres = pSvc->ExecQuery(
        _bstr_t("WQL"),
        _bstr_t("SELECT * FROM Win32_NetworkAdapterConfiguration WHERE IPEnabled = 'TRUE'"),
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY,
        NULL,
        &pEnumerator
    );
    if (FAILED(hres))
    {
        std::cerr << "Failed to execute WQL query" << std::endl;
        pSvc->Release();
        pLoc->Release();
        CoUninitialize();
        return 1;
    }

    // 遍历查询结果
    ULONG uReturn = 0;
    while (pEnumerator)
    {
        IWbemClassObject* pclsObj = NULL;
        HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1, &pclsObj, &uReturn);
        if (0 == uReturn)
        {
            break;
        }

        VARIANT vtProp;
        hr = pclsObj->Get(L"MACAddress", 0, &vtProp, 0, 0);
        if (SUCCEEDED(hr))
        {
            std::wcout << "MAC Address: " << vtProp.bstrVal << std::endl;
            VariantClear(&vtProp);
        }

        pclsObj->Release();
    }

    // 释放资源
    pEnumerator->Release();
    pSvc->Release();
    pLoc->Release();
    CoUninitialize();

    return 0;
}

其中，关键的查询语句为：

SELECT * FROM Win32_NetworkAdapterConfiguration WHERE IPEnabled = 'TRUE'

该语句查询所有已启用IP协议的网络适配器的配置信息，其中包括MAC地址。最终的结果通过遍历查询结果来获取。