Develop Reference

How to make byte array of string type data using c#

I have
string FieldName = "70778203048000022800101980197011000403364161025115108169019130064124025314701282420179220012222500653502306514513063501621600641710539012820602201612822031760654616264064251063248011208023217501282310240641420165320128137014031064148178170645902192050642120103250065217247064761631012941184144064122030190";
and I am trying to get it in byte array using this code
byte[] fingerbuffer1 = Encoding.ASCII.GetBytes(FieldName);
OR
byte[] fingerbuffer = Encoding.UTF8.GetBytes(FieldName);
but it gives encoded data of "FieldName" like
byte[] fingerbuffer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
but I need exact data of "FieldName" in byte[]
byte[] fingerbuffer = "70778203048000022800101980197011000403364161025115108169019130064124025314701282420179220012222500653502306514513063501621600641710539012820602201612822031760654616264064251063248011208023217501282310240641420165320128137014031064148178170645902192050642120103250065217247064761631012941184144064122030190";
OR my second question is :- how same data can retrieve from database in byte[].

static byte[] GetBytes(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
static string GetString(byte[] bytes)
{
char[] chars = new char[bytes.Length / sizeof(char)];
System.Buffer.BlockCopy(bytes, 0, chars, 0, bytes.Length);
return new string(chars);
}

How do I read exactly one char from a Stream?

I have a Stream with some text data (can be ASCII, UTF-8, Unicode; encoding is known). I need to read exactly one char from the stream, without advancing stream position any longer. StreamReader is inappropriate, as it aggressively prefetches data from the stream.
Ideas?

If you want to read and decode the text one byte at a time, the most convenient approach I know of is to use the System.Text.Decoder class.
Here's a simple example:
class Program
{
static void Main(string[] args)
{
Console.OutputEncoding = Encoding.Unicode;
string originalText = "Hello world! ブ䥺ぎょズィ穃 槞こ廤樊稧 ひゃご禺 壪";
byte[] rgb = Encoding.UTF8.GetBytes(originalText);
MemoryStream dataStream = new MemoryStream(rgb);
string result = DecodeOneByteAtATimeFromStream(dataStream);
Console.WriteLine("Result string: \"" + result + "\"");
if (originalText == result)
{
Console.WriteLine("Original and result strings are equal");
}
}
static string DecodeOneByteAtATimeFromStream(MemoryStream dataStream)
{
Decoder decoder = Encoding.UTF8.GetDecoder();
StringBuilder sb = new StringBuilder();
int inputByteCount;
byte[] inputBuffer = new byte[1];
while ((inputByteCount = dataStream.Read(inputBuffer, 0, 1)) > 0)
{
int charCount = decoder.GetCharCount(inputBuffer, 0, 1);
char[] rgch = new char[charCount];
decoder.GetChars(inputBuffer, 0, 1, rgch, 0);
sb.Append(rgch);
}
return sb.ToString();
}
}
Presumably you are already aware of the drawbacks of processing data of any sort just one byte at a time. :) Suffice to say, this is not a very efficient way to do things.

Convert binary to string not works

I created a simple program.
I create a string and compress it by following methods and store it in a binary data field type in sql server 2008 (binary(1000) field type).
When I read that binary data and result string is true like original string data with the same length and data but when I want to decompress it it gave me an error.
I use this method to get bytes:
System.Text.ASCIIEncoding.ASCII.GetBytes(mystring)
And this method to get string:
System.Text.ASCIIEncoding.ASCII.GetString(binarydata)
In hard code in VS2012 editor, result string works fine, but when I read it from sql it gives me this error in first line of decompression method:
The input is not a valid Base-64 string as it contains a
non-base 64 character, more than two padding characters,
or a non-white space character among the padding characters.
What's wrong with my code? These two strings are same but
string test1=Decompress("mystring");
...this method works fine but this gave me that error and can not decompress retrieved string
string temp=System.Text.ASCIIEncoding.ASCII.GetString(get data from sql) ;
string test2=Decompress(temp);
The comparing these string do not shows any deference
int result = string.Compare(test1, test2); // result=0
My compression method:
public static string Compress(string text)
{
byte[] buffer = Encoding.UTF8.GetBytes(text);
var memoryStream = new MemoryStream();
using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Compress, true))
{
gZipStream.Write(buffer, 0, buffer.Length);
}
memoryStream.Position = 0;
var compressedData = new byte[memoryStream.Length];
memoryStream.Read(compressedData, 0, compressedData.Length);
var gZipBuffer = new byte[compressedData.Length + 4];
Buffer.BlockCopy(compressedData, 0, gZipBuffer, 4, compressedData.Length);
Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gZipBuffer, 0, 4);
return Convert.ToBase64String(gZipBuffer);
}
My decompression method:
public static string Decompress(string compressedText)
{
byte[] gZipBuffer = Convert.FromBase64String(compressedText);
using (var memoryStream = new MemoryStream())
{
int dataLength = BitConverter.ToInt32(gZipBuffer, 0);
memoryStream.Write(gZipBuffer, 4, gZipBuffer.Length - 4);
var buffer = new byte[dataLength];
memoryStream.Position = 0;
using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress))
{
gZipStream.Read(buffer, 0, buffer.Length);
}
return Encoding.UTF8.GetString(buffer);
}
}

The most likely issue is the way you are getting the string from the SQL binary filed.
Currently (I guess, you have not showed how you stored or retrieved your data from SQL)
Compress : Text -> UTF8.GetBytes -> compress -> base64 string-> Send to Sql (transformed to binary)
Decompress: Binary -> String representation of binary -> base64 decode -> decompress -> UTF8.GetString
Your issue is the String representation of binary step is not the same as the Send to Sql (transformed to binary). If you are storing this as a varbinary you should be returning the byte array from compress and decompress should take in a byte array.
public byte[] string Compress(string text)
{
//Snip
}
public static string Decompress(byte[] compressedText)
{
//Snip
}
this changes your process to
Compress : Text -> UTF8.GetBytes -> compress -> Send to Sql
Decompress: Binary -> decompress -> UTF8.GetString

Decoding string xml in .net

Hy,
i want to decode a string which contain xml data in .net
but that string was encoded in java
System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
System.Text.Decoder utf8Decode = encoder.GetDecoder();
byte[] todecode_byte = Convert.FromBase64String(data);
int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[] decoded_char = new char[charCount];
utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
result = new String(decoded_char);
return result;
i have written that code but it throw error.
Thanks in Advance.

Assuming it really is UTF-8 which is then base64-encoded, you should just be able to write:
byte[] binary = Convert.FromBase64String(data);
string text = Encoding.UTF8.GetString(binary);
However, it sounds like it wasn't base64-encoded to start with - if you've already got it as text, you should be able to use it without any extra work.

Unicode-to-string conversion in C#

How can I convert a Unicode value to its equivalent string?
For example, I have "రమెశ్", and I need a function that accepts this Unicode value and returns a string.
I was looking at the System.Text.Encoding.Convert() function, but that does not take in a Unicode value; it takes two encodings and a byte array.
I bascially have a byte array that I need to save in a string field and then come back later and convert the string first back to a byte array.
So I use ByteConverter.GetString(byteArray) to save the byte array to a string, but I can't get it back to a byte array.

Use .ToString();:
this.Text = ((char)0x00D7).ToString();

Try the following:
byte[] bytes = ...;
string convertedUtf8 = Encoding.UTF8.GetString(bytes);
string convertedUtf16 = Encoding.Unicode.GetString(bytes); // For UTF-16
The other way around is using `GetBytes():
byte[] bytesUtf8 = Encoding.UTF8.GetBytes(convertedUtf8);
byte[] bytesUtf16 = Encoding.Unicode.GetBytes(convertedUtf16);
In the Encoding class, there are more variants if you need them.

To convert a string to a Unicode string, do it like this: very simple... note the BytesToString function which avoids using any inbuilt conversion stuff. Fast, too.
private string BytesToString(byte[] Bytes)
{
MemoryStream MS = new MemoryStream(Bytes);
StreamReader SR = new StreamReader(MS);
string S = SR.ReadToEnd();
SR.Close();
return S;
}
private string ToUnicode(string S)
{
return BytesToString(new UnicodeEncoding().GetBytes(S));
}

UTF8Encoding Class
UTF8Encoding uni = new UTF8Encoding();
Console.WriteLine( uni.GetString(new byte[] { 1, 2 }));

There are different types of encoding. You can try some of them to see if your bytestream get converted correctly:
System.Text.ASCIIEncoding encodingASCII = new System.Text.ASCIIEncoding();
System.Text.UTF8Encoding encodingUTF8 = new System.Text.UTF8Encoding();
System.Text.UnicodeEncoding encodingUNICODE = new System.Text.UnicodeEncoding();
var ascii = string.Format("{0}: {1}", encodingASCII.ToString(), encodingASCII.GetString(textBytesASCII));
var utf = string.Format("{0}: {1}", encodingUTF8.ToString(), encodingUTF8.GetString(textBytesUTF8));
var unicode = string.Format("{0}: {1}", encodingUNICODE.ToString(), encodingUNICODE.GetString(textBytesCyrillic));
Have a look here as well: http://george2giga.com/2010/10/08/c-text-encoding-and-transcoding/.

var ascii = $"{new ASCIIEncoding().ToString()}: {((ASCIIEncoding)new ASCIIEncoding()).GetString(textBytesASCII)}";
var utf = $"{new UTF8Encoding().ToString()}: {((UTF8Encoding)new UTF8Encoding()).GetString(textBytesUTF8)}";
var unicode = $"{new UnicodeEncoding().ToString()}: {((UnicodeEncoding)new UnicodeEncoding()).GetString(textBytesCyrillic)}";

Wrote a cycle for converting unicode symbols in string to UTF8 letters:
string stringWithUnicodeSymbols = #"{""id"": 10440119, ""photo"": 10945418, ""first_name"": ""\u0415\u0432\u0433\u0435\u043d\u0438\u0439""}";
var splitted = Regex.Split(stringWithUnicodeSymbols, #"\\u([a-fA-F\d]{4})");
string outString = "";
foreach (var s in splitted)
{
try
{
if (s.Length == 4)
{
var decoded = ((char) Convert.ToUInt16(s, 16)).ToString();
outString += decoded;
}
else
{
outString += s;
}
}
catch (Exception e)
{
outString += s;
}
}