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C# (Overflow in Hex? or ASCII?)

1 New Member
This C# program is use to convert decimal to hex and send through serial port in ASCII characters. For example: I try to send a string variable in Hex format which i need to convert to a standart ASCII string; eg "70d9b7" where "b7" is the checksum of 2's complement. i have some problem in convert the "d9" and "b7" to the correct ASCII string as the ASCII is overflow from 8 till F, i think... If anyone can help me to debug the problem, i would be very grateful... Thanks a lot...


# region using directive
using System;
using System.IO.Ports ;
using System.Threadin g;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
# endregion

namespace WindowsApplicat ion1
{
public partial class Form1 : Form
{

SerialPort sp = new SerialPort("COM 2", 9600, Parity.None, 8, StopBits.One);
int Val1, Val2;

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private string HexAsciiConvert (string hexValue1)
{
StringBuilder sb = new StringBuilder() ;

for (int i = 0; i <= hexValue1.Lengt h - 2; i += 2)
{
sb.Append(Conve rt.ToString(Con vert.ToChar(Int 32.Parse(hexVal ue1.Substring(i , 2), System.Globaliz ation.NumberSty les.HexNumber)) ));
}

for (int i = 8; i <= hexValue1.Lengt h - 2; i++)
{
sb.Append(Conve rt.ToChar(Int32 .Parse(hexValue 1, System.Globaliz ation.NumberSty les.HexNumber)) );
}

return sb.ToString();

}

private void button3_Click(o bject sender, EventArgs e)
{
Val1 = Val2 = 0;

if (H0_1.Checked == true)
{
Val1 = Val1 + 1;
}

if (H1_1.Checked == true)
{
Val1 = Val1 + 2;
}

if (H2_1.Checked == true)
{
Val1 = Val1 + 4;
}

if (H3_1.Checked == true)
{
Val1 = Val1 + 8;
}

if (H4_1.Checked == true)
{
Val1 = Val1 + 16;
}

if (H5_1.Checked == true)
{
Val1 = Val1 + 32;
}

if (H6_1.Checked == true)
{
Val1 = Val1 + 64;
}

if (H7_1.Checked == true)
{
Val1 = Val1 + 128;
}

if (D0.Checked == true)
{
Val2 = Val2 + 1;
}

if (D1.Checked == true)
{
Val2 = Val2 + 2;
}

if (D2.Checked == true)
{
Val2 = Val2 + 4;
}

if (D3.Checked == true)
{
Val2 = Val2 + 8;
}

if (D4.Checked == true)
{
Val2 = Val2 + 16;
}

if (D5.Checked == true)
{
Val2 = Val2 + 32;
}

if (D6.Checked == true)
{
Val2 = Val2 + 64;
}

if (D7.Checked == true)
{
Val2 = Val2 + 128;
}


{
textread.Text = "";


int checksum = (byte)~(Val1 + Val2) + 1;
string a = checksum.ToStri ng("x");

string hexValue1;
string hexValue2;

if ( Val1< 16)
{
hexValue1 = "0" + Val1.ToString(" x");
}

else

hexValue1 = Val1.ToString(" x");


if (Val2< 16)
{
hexValue2 = "0" + Val2.ToString(" x");
}

else

hexValue2 = Val2.ToString(" x");

textread.Text = hexValue1 + hexValue2 + a;
}


}

private void button1_Click(o bject sender, EventArgs e)
{
string hexValue1;
string hexValue2;

if (Val1 < 16)
{
hexValue1 = "0" + Val1.ToString(" x");
}

else

hexValue1 = Val1.ToString(" x");

if (Val2 < 16)
{
hexValue2 = "0" + Val2.ToString(" x");
}

else

hexValue2 = Val2.ToString(" x");


int checksum = (byte)~(Val1 + Val2) + 1;
string a = checksum.ToStri ng("x");

hexValue1 = HexAsciiConvert (hexValue1);
hexValue2 = HexAsciiConvert (hexValue2);
a = HexAsciiConvert (a);

textsend.Text = hexValue1 + hexValue2 + a;

sp.Open();

sp.Write(textse nd.Text);

sp.Close();

}



emily
May 30 '07 #1
2 2029
blackjack2150
79 New Member
Converting decimal to hex shouldn't be to much trouble.
The second part is converting the hex to ASCII and sending it.
Each hex digit can be represented on 4 bits, so an ASCII character which takes up 8 bits can store 2 hex digits.

So, if you have let's say 2AC1 in hex, that means 001010101100000 1 in binary which results in two ASCII characters: *┴(codes 42 and 193 in decimal).
May 30 '07 #2
Plater
7,872 Recognized Expert Expert
integers have their .ToString() overloaded to take in "X" which will output a string representation of the number in hex

[code]
int a=255;
string myhex=a.ToStrin g("X");
//myhex is now "FF"

Likewise, the int.Parse() is overloaded to take in a string representation of a number in hex digits.
Aug 1 '07 #3

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