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Convert long to byte array to string representation

Hi all,

I'm working with a 3rd party com method with returns a "dword" which is 32 bits. The first 16 bits contains info, and the rest is empty.

Using c#, I'm trying to get the returned value (which I think is a long?), convert that value to a byte array, and then get the string representation of the whole lot.

What I'm hoping to end up with is something like this:
"0000 1011 0000 0000" - without the spaces.
Each bit represents an error message and this is why I need to shift through the string values at specific indexes etc.

Can someone please help with this, I'm getting nowhere fast.

Thank you in advance,

1 Solution
UInt32 can be converted using BitConverter.GetBytes

See: http://msdn.microsoft.com/en-us/library/1184xdy4.aspx

// Example of the BitConverter.GetBytes( uint ) method.
using System;

class GetBytesUInt32Demo
    const string formatter = "{0,16}{1,20}";

    // Convert a uint argument to a byte array and display it.
    public static void GetBytesUInt32( uint argument )
        byte[ ] byteArray = BitConverter.GetBytes( argument );
        Console.WriteLine( formatter, argument,
            BitConverter.ToString( byteArray ) );

    public static void Main( )
            "This example of the BitConverter.GetBytes( uint ) " +
            "\nmethod generates the following output.\n" );
        Console.WriteLine( formatter, "uint", "byte array" );
        Console.WriteLine( formatter, "----", "----------" );

        // Convert uint values and display the results.
        GetBytesUInt32( 15 );
        GetBytesUInt32( 1023 );
        GetBytesUInt32( 0x100000 );
        GetBytesUInt32( 1000000000 );
        GetBytesUInt32( uint.MinValue );
        GetBytesUInt32( int.MaxValue );
        GetBytesUInt32( uint.MaxValue );

This example of the BitConverter.GetBytes( uint )
method generates the following output.

            uint          byte array
            ----          ----------
              15         0F-00-00-00
            1023         FF-03-00-00
         1048576         00-00-10-00
      1000000000         00-CA-9A-3B
               0         00-00-00-00
      2147483647         FF-FF-FF-7F
      4294967295         FF-FF-FF-FF
You can get your 0s and 1s by converting the HEX value into a binary value.

Hex - Binary
0 = 0000
1 = 0001
2 = 0010
3 = 0011
4 = 0100
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Could you post the dword value that you are getting from 3rd party com method? so that any one of us help you with possible solution.
Sunny_KumarAuthor Commented:
Thanks for all the help guys! Much appreciated!
c# has the same bit operations as c and c++.

so you could do

if ((ui & (1<<i) != 0) 

Open in new window

what would test whether the unsigned integer ui has bit value 1 at bit position i.

that works cause 1<<i moves bit 0 to bit i  and the ui & operation makes a bitwise 'and' such that the result either is 0 (all bits are 0) or has exactly 1 bit at position i.

there is a typo. it should be

if ((ui & (1<<i)) != 0)

Open in new window



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