Base64 Decoding

[Kuldeep]

Hi All,

Could you please give me some guidelines on dealing with
Base64 encoded string.
The actual purpose is to decode Base64 Encoded string
and stream the data to a browser so that it can be viewed
in a web application

Regards,
Kuldeep

 

[Siva M]

Not sure what exactly you are looking for. If you are finding a way to
decode a base64 string, use Convert.FromBase64String()

Hi All,

Could you please give me some guidelines on dealing with
Base64 encoded string.
The actual purpose is to decode Base64 Encoded string
and stream the data to a browser so that it can be viewed
in a web application

Regards,
Kuldeep

 

[Gary Francis]

Base64Decode function

Here is a simple function to decode a base64 encoded string:

    public static string Base64Decode(string data)
    {
        try
        {
            // Decode the base 64 string into a decoded byte array
            System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
            System.Text.Decoder utf8Decode = encoder.GetDecoder();
            byte[] todecode_byte = Convert.FromBase64String(data);

            // Calculate the number of characters in the string
            int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);

            // Convert the byte array to a char array
            char[] decoded_char = new char[charCount];
            utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);

            // Convert the char array into a string
            string result = new String(decoded_char);
            return result;
        }
        catch (Exception e)
        {
            throw new Exception("Error in base64Decode" + e.Message);
        }
    }

I hope this is what you are looking for.

Gary Francis
Software Developer
Providing UK IT Support

 

[Guest]

public static string Base64Encode(string data) {
byte[] myBytes = Encoding.ASCII.GetBytes(data.Trim().ToCharArray());
return Convert.ToBase64String (myBytes);
}

public static string Base64Decode(string data) {
try {
return Encoding.ASCII.GetString (Convert.FromBase64String (data.Trim()));
} catch {
// Invalid String!
return "";
}
}