windows平台c语言获取mac的代码

获取MAC地址需要使用Windows API函数，以下是获取MAC地址的C语言代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <iphlpapi.h>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

int main()
{
    PIP_ADAPTER_INFO pAdapterInfo;
    PIP_ADAPTER_INFO pAdapter = NULL;
    ULONG ulOutBufLen = sizeof(IP_ADAPTER_INFO);
    DWORD dwRetVal = 0;

    pAdapterInfo = (IP_ADAPTER_INFO *)malloc(sizeof(IP_ADAPTER_INFO));
    if (pAdapterInfo == NULL) {
        printf("Error allocating memory needed to call GetAdaptersinfo\n");
        return 1;
    }

    if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
        free(pAdapterInfo);
        pAdapterInfo = (IP_ADAPTER_INFO *)malloc(ulOutBufLen);
        if (pAdapterInfo == NULL) {
            printf("Error allocating memory needed to call GetAdaptersinfo\n");
            return 1;
        }
    }

    if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) != NO_ERROR) {
        printf("GetAdaptersInfo failed with error %d\n", dwRetVal);
        return 1;
    }

    pAdapter = pAdapterInfo;
    while (pAdapter) {
        printf("%02X:%02X:%02X:%02X:%02X:%02X\n",
            pAdapter->Address[0], pAdapter->Address[1], pAdapter->Address[2],
            pAdapter->Address[3], pAdapter->Address[4], pAdapter->Address[5]);
        pAdapter = pAdapter->Next;
    }

    if (pAdapterInfo) {
        free(pAdapterInfo);
    }

    return 0;
}

这个代码使用了Windows API函数`GetAdaptersInfo()`来获取网卡信息，包括MAC地址。当有多个网卡时，会遍历所有网卡并输出它们的MAC地址。