Converting Back from Decimal to Byte

computerpublic

/*
IT DOESN'T WORK..I ADDED THE LINE:::string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
I RAN THE PROGRAM AND CHECK FOLDER WAS EMPTY. THE FILE WAS NOT WRITTEN TO THE NEW LOCATION. ALL I WANT TO DO SEE ANOTHER INSTANCE OF THE FILE
*/

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Applica
{
class Program
{
static void Main(string[] args)
{
DirectoryInfo da = new DirectoryInfo("C:\\Folder");
FileInfo[] Arr = da.GetFiles();
if (Arr.Length == 0)
{
throw new InvalidOperationException("No files found.");
}
// No need to loop through the array just to get the last item:
FileInfo ap = Arr[Arr.Length - 1];
long Totbyte = ap.Length;
string filePath = ap.FullName;
Console.WriteLine("Total Bytes = {0} bytes", Totbyte);
// GetTempFileName *creates* the file, so it always exists:
string temPath = Path.GetTempFileName();
byte[] data = File.ReadAllBytes(filePath);
File.WriteAllBytes(temPath, data);
// Convert the bytes to decimals:
decimal[] arry = new decimal[Totbyte];
for (int count = 0; count < data.Length; count++)
{
arry[count] = data[count];
}
// Convert the decimals back to bytes:
byte[] data2 = new byte[Totbyte];
for (int count = 0; count < arry.Length; count++)
{
data2[count] = (byte)arry[count];
}
// Just to prove they're the same:
if (data2.Length != data.Length)
{
throw new InvalidOperationException("Wrong length!");
}
for (int index = 0; index < data.Length; index++)
{
if (data[index] != data2[index])
{
throw new InvalidOperationException("Data has changed at index " + index);
}
}
// Write the bytes back to the file:
string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
File.WriteAllBytes(filePath, data2);
// To prove they're still the same:
data = File.ReadAllBytes(temPath);
data2 = File.ReadAllBytes(filePath);
if (

Richard Deeming

computerpublic wrote:

string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath)); File.WriteAllBytes(filePath, data2);

If you want to write the bytes to the file whose path is stored in the filePath2 variable, then you need to pass that variable to the WriteAllBytes method, as I showed you in my previous answer[^].

// Write the bytes to a different file:
string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
File.WriteAllBytes(filePath2, data2); // <-- NB: Pass filePath2 here, not filePath!

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

computerpublic

It works. Thank you very much Richard.

computerpublic

/*
I AM NOW TRYING TO CONVERT BYTE TO STRING AND ALSO CONVERTING BACK FROM STRING TO BYTE.
I ALSO WANT TO SEE THE OUTPUT.
I AM NOT UNDERSTING WHY I AM GETTING AN ERROR.
THE OUTPUT INFORMATION IS BELOW::

Total Bytes = 8228730 bytes

Unhandled Exception: System.InvalidOperationException: Data has changed at index
310
at Applica.Program.Main(String[] args) in C:\Documents and Settings\shampro\D
esktop\Program.cs:line 41
Press any key to continue . . .
*/

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Applica
{
class Program
{
static void Main(string[] args)
{
DirectoryInfo da = new DirectoryInfo("C:\\Folder");
FileInfo[] Arr = da.GetFiles();
if (Arr.Length == 0)
{
throw new InvalidOperationException("No files found.");
}
// No need to loop through the array just to get the last item:
FileInfo ap = Arr[Arr.Length - 1];
long Totbyte = ap.Length;
string filePath = ap.FullName;
Console.WriteLine("Total Bytes = {0} bytes", Totbyte);
// GetTempFileName *creates* the file, so it always exists:
string temPath = Path.GetTempFileName();
byte[] data = File.ReadAllBytes(filePath);
File.WriteAllBytes(temPath, data);
// Convert the bytes to string:
string arry = ASCIIEncoding.ASCII.GetString(data);
Console.WriteLine(arry);
// Convert the string back to bytes:
byte[] data2 = Encoding.ASCII.GetBytes(arry);
foreach (byte element in data2)
{
Console.WriteLine("{0}={1}",element ,(char)element);
}
// Just to prove they're the same:
if (data2.Length != data.Length)
{
throw new InvalidOperationException("Wrong length!");
}
for (int index = 0; index < data.Length; index++)
{
if (data[index] != data2[index])
{
throw new InvalidOperationException("Data has changed at index " + index);
}
}
// Write the bytes back to the file:
string filePath2 = Path.Combine("C:\\check", Path.GetFileName(filePath));
File.WriteAllBytes(filePath2, data2);
// To prove they're

computerpublic

SORRY, THE PROBLEM IS ON LINE 61. BEFORE THE PROBLEM WAS ON LINE 41, BUT I ADDED COMMENTS AND SHIFTED THE ENTIRE THING DOWN.

Richard Deeming

Hardly surprising - ASCII encoding can only cope with 128 characters. If any of your bytes are greater than or equal to 128, the ASCIIEncoding class[^] will replace them with a question mark. When you re-encode the string, these bytes will have been replaced with the value 63. You still haven't explained what you're trying to achieve.

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

computerpublic

I am trying to become a good programmer, but following the examples in the books sometimes does not work. The professor in the school is also very suspicious. I think she is reading the chapters before the class and pretending like she knows. She never answers direct questions. The answer always come in the next class session. I feel I am on my own with c#. Sometimes I feel that the people who write the books, don't know any c# at all. How it is possible for examples in text not to work. I encounter this problem many times and it is very frustrating. To add to the frustration, I go online to the help forums and I continually being ask "What are you trying to achieve"? As if a non programmer is not allowed to ask questions and learn from people who know. I am trying to learn from people who know, that is what I am trying to achieve. I hope this answers the question.

computerpublic

Could you please kindly respond to my new post "Out Of Memory Exception"? It is a completely different question, so I didn't thought it wise to post it here. Thank You.

Richard Deeming

computerpublic wrote:

I continually being ask "What are you trying to achieve"? As if a non programmer is not allowed to ask questions and learn from people who know.

We don't ask what you're trying to achieve because we don't want you asking questions; it's just that, if you tell us what you want the code to do, we might be able to point you towards a better solution. It's often better to take a step back and look at the bigger picture of what you want to do, rather than fixating on why a particular line of code doesn't do what you expect. :) Your professor certainly doesn't sound like she's up to the job. Have you tried talking to your tutor about your concerns?

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

computerpublic

/*If I am generating a series of bits ONE BIT AT A TIME for example {10101000}. How do I turn the entire series into one byte after I generate the 8th bit. I am trying to back track using the example you gave me, but I am getting some errors.*/

using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Applica
{
class Program
{
static Random _random = new Random ();////Start: Fisher-Yates Array Shuffler
public static void Shuffle<T>(T[] array)
{
var random = _random;
for (int i = array.Length; i > 1; i--)
{
int j = random.Next(i);
T tmp = array[j];
array[j] = array[i - 1];
array[i - 1] = tmp;
}
}////////////////////////////////////////////End: Fisher-Yates Array Shuffer
static void Main(string[] args)
{
byte[] outdata = new byte[1];
BitArray[] bits2 = new BitArray[8];
char[] array = {'1','0','1','0','1','0','1','0'};
Shuffle(array);
for (int i = 0; i < 8; i++)
bits2[i] = array[1];//Error: Cannot Implicitly convert type 'char' to 'System.Collections.BitArray'
outdata[i] = (byte)bits2;//Error: Cannot convert type 'System.Collections.BitArray[]' to 'byte'
}
}
}