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copied!<p>I got it people! Me and a guy from the work solve this using this code:</p> <pre><code>#include <stdio.h> #include <Windows.h> #include <Iphlpapi.h> #include <Assert.h> #pragma comment(lib, "iphlpapi.lib") char* getMAC(); int main(){ char* pMac = getMAC(); system("pause"); free(pMac); } char* getMAC() { PIP_ADAPTER_INFO AdapterInfo; DWORD dwBufLen = sizeof(IP_ADAPTER_INFO); char *mac_addr = (char*)malloc(18); AdapterInfo = (IP_ADAPTER_INFO *) malloc(sizeof(IP_ADAPTER_INFO)); if (AdapterInfo == NULL) { printf("Error allocating memory needed to call GetAdaptersinfo\n"); free(mac_addr); return NULL; // it is safe to call free(NULL) } // Make an initial call to GetAdaptersInfo to get the necessary size into the dwBufLen variable if (GetAdaptersInfo(AdapterInfo, &dwBufLen) == ERROR_BUFFER_OVERFLOW) { free(AdapterInfo); AdapterInfo = (IP_ADAPTER_INFO *) malloc(dwBufLen); if (AdapterInfo == NULL) { printf("Error allocating memory needed to call GetAdaptersinfo\n"); free(mac_addr); return NULL; } } if (GetAdaptersInfo(AdapterInfo, &dwBufLen) == NO_ERROR) { // Contains pointer to current adapter info PIP_ADAPTER_INFO pAdapterInfo = AdapterInfo; do { // technically should look at pAdapterInfo->AddressLength // and not assume it is 6. sprintf(mac_addr, "%02X:%02X:%02X:%02X:%02X:%02X", pAdapterInfo->Address[0], pAdapterInfo->Address[1], pAdapterInfo->Address[2], pAdapterInfo->Address[3], pAdapterInfo->Address[4], pAdapterInfo->Address[5]); printf("Address: %s, mac: %s\n", pAdapterInfo->IpAddressList.IpAddress.String, mac_addr); // print them all, return the last one. // return mac_addr; printf("\n"); pAdapterInfo = pAdapterInfo->Next; } while(pAdapterInfo); } free(AdapterInfo); return mac_addr; // caller must free. } </code></pre>

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