Get win32 registry value

See more:

Windows

Win32

VisualC++

registry

How can we parse

RegOpenKeyEx(HKEY_LOCAL_MACHINE,L"SYSTEM\\CurrentControlSet\\Enum\\BTHENUM\\{00001101-0000-1000-8000-00805f9b34fb}_LOCALMFG&000f\\9&3408FE52&0&646E6C00E02E_C00000000\\Device Parameters", 0, KEY_QUERY_VALUE, &hKey)  )

so that we can use it for each GUID (traversing available guid to DeviceParameters )

SYSTEM\\CurrentControlSet\\Enum\\BTHENUM\\[GUID1...x]\\[Somenumber]\\DeviceParameters


Currently i am able to do it for single hard coded GUID value but GUID may differ machine to machine so i want to make it dynamic GUID parsing.

LPCTSTR const lpValueName = L"PortName";
	  HKEY  hKey       = NULL; 
	  
   if(ERROR_SUCCESS != RegOpenKeyEx(HKEY_LOCAL_MACHINE,L"SYSTEM\\CurrentControlSet\\Enum\\BTHENUM\\{00001101-0000-1000-8000-00805f9b34fb}_LOCALMFG&000f\\9&3408FE52&0&646E6C00E02E_C00000000\\Device Parameters", 0, KEY_QUERY_VALUE, &hKey)  )
       return 1;
  

   DWORD dwDataType = 0;
   LPBYTE lpValue   = NULL;

   RegQueryValueEx(  hKey, 
                     lpValueName,
                     0,
                     &dwDataType,
                     lpValue,  // NULL
                     &dwSize); // will contain the data size
	

   // Alloc the buffer
   lpValue = (LPBYTE)malloc(dwSize);

   // Call twice RegQueryValueEx to get the value
   int lRet = RegQueryValueEx(hKey, 
                            lpValueName,
                            0,
                            &dwDataType,
                            lpValue,
                            &dwSize);
	RegCloseKey(hKey);

Thanks in advance :)