Question

I have problem with getting value from binary registry key.
My code so far is

string key = "UserPreferencesMask";
        string key_place = @"Control Panel\Desktop";
        RegistryKey root = Registry.CurrentUser;
        root = root.OpenSubKey(key_place);
        var byte_value = root.GetValue(key);
        byte[] bytearray = byte_value as byte[];
        //How can convert byte [] array to 64 bit binary string
         klase.Close();
         MessageBox.Show(binary_string);

I am stacked when i want

UserPreferencesMask

binary registry key to convert 64bit binary string . something like this
from

9E3E078012000000

hex value
to

1001111000111110000001111000000000010010000000000000000000000000

binary value

But if i build code which convert from hex to binary, i have wrong binary value if in hex number has first one or two or more zero numbers. Binary returns without first zero numbers, only count start from first byte value with 1 , and has no error if hex started with any other char,except 0
How can i solve problem ? I searched everywhere, but i found only hex to binary ., but this cause an error for me, and returned value aren’t 64 bit value lenght.
Thank’s !

Answer 1

Converter.ToString( BitConverter.ToInt64( bytearray, 0 ), 2 ).PadLeft( 64, '0' ); 

If the original number is the wrong endianness then its pretty easy to just do an:

Array.Reverse( bytearray );

before you run the first line.