c++获取windows正在使用的网卡的MAC地址

c++获取windows正在使用的网卡的MAC地址

这个方法是stackoverflow上找到的，在这做个记录，相关的头文件请查找我之前的文章

TCHAR szMac[MAX_PATH] = { 0 };
	int nBuffSize = MAX_PATH;
	std::string nError = "";
	if (szMac == NULL || nBuffSize < 18) return nError;

	HKEY hKey = NULL;
	HKEY hKey2 = NULL;
	TCHAR szKey[MAX_PATH], szBuffer[MAX_PATH];
	TCHAR szServiceName[MAX_PATH];
	TCHAR szFileName[MAX_PATH] = { 0 };
	DWORD dwRet = 0;
	DWORD dwType = 0;
	DWORD cbData = 0;
	DWORD cName = _countof(szBuffer);
	if (RegOpenKey(HKEY_LOCAL_MACHINE, _T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards\\"), &hKey) != ERROR_SUCCESS)
		return nError;

	for (int i = 0; RegEnumKeyEx(hKey, i, szBuffer, &cName, NULL, NULL, NULL, NULL) == ERROR_SUCCESS; ++i, cName = _countof(szBuffer))
	{
		_tcscpy_s(szKey, MAX_PATH, _T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\NetworkCards\\"));
		_tcscat_s(szKey, MAX_PATH, szBuffer);
		if (RegOpenKey(HKEY_LOCAL_MACHINE, szKey, &hKey2) != ERROR_SUCCESS)
		{
			continue;
		}

		dwType = REG_SZ;
		cbData = MAX_PATH * sizeof(TCHAR);
		if (RegQueryValueEx(hKey2, _T("ServiceName"), NULL, &dwType, (LPBYTE)szServiceName, &cbData) == ERROR_SUCCESS)
		{
			//读取成功后关闭句柄
			RegCloseKey(hKey2);

			_tcscpy_s(szFileName, MAX_PATH, _T("\\\\.\\"));
			_tcscat_s(szFileName, MAX_PATH, szServiceName);
			HANDLE hFile = CreateFile(szFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
			if (hFile != INVALID_HANDLE_VALUE) {
				DWORD dwInBuff = 0x01010101;
				BYTE outBuff[MAX_PATH];
				dwRet = DeviceIoControl(hFile, 0x00170002, &dwInBuff, sizeof(dwInBuff), outBuff, sizeof(outBuff), &cbData, NULL);

				//无论成功失败关闭文件句柄
				CloseHandle(hFile);
				hFile = INVALID_HANDLE_VALUE;

				if (dwRet)
				{
					_stprintf_s(
						szMac, nBuffSize / sizeof(TCHAR),
						_T("%02X-%02X-%02X-%02X-%02X-%02X"),
						outBuff[0], outBuff[1], outBuff[2],
						outBuff[3], outBuff[4], outBuff[5]
					);
					break;
				}
			}
		}
		else
		{
			//读取失败关闭句柄
			RegCloseKey(hKey2);
		}
	}//end for
	if (hKey != NULL)
	{
		RegCloseKey(hKey);
	}
	std::string MAC;
	int iLen = WideCharToMultiByte(CP_ACP, 0, szMac, -1, NULL, 0, NULL, NULL);
	char* chRtn = new char[iLen * sizeof(char)];
	WideCharToMultiByte(CP_ACP, 0, szMac, -1, chRtn, iLen, NULL, NULL);
	MAC = chRtn;
	return MAC;

做个记录，防止以后忘记