String characters to int.

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  1. #1
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    String characters to int.

    Hello,

    I'm trying to get the int value of each character in a string and then add them all together so I can do a 1's complement of the total value. I'm trying to do simple checkum kinda of thing for verification of data.

    For example:


    string DPacket = "Hello World!";

    I would like to have each character added and do the ones complement.
    Will it be easier to convert first to int and then add or any other easier way?

    so my result should be the decimal value addition of each character and then do the ones complement to that.

  2. #2
    SAMARAS std10093's Avatar
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    what it comes to mind for me is the ASCII codes of the every char.This is what you say?

  3. #3
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    Quote Originally Posted by drkidd22 View Post
    Hello,

    I'm trying to get the int value of each character in a string and then add them all together so I can do a 1's complement of the total value. I'm trying to do simple checkum kinda of thing for verification of data.

    For example:


    string DPacket = "Hello World!";

    I would like to have each character added and do the ones complement.
    Will it be easier to convert first to int and then add or any other easier way?

    so my result should be the decimal value addition of each character and then do the ones complement to that.
    How many bits do you plan to use as the checksum? Are your strings primarily in the Latin character set? How long are you anticipating the strings will be on average? For that matter - what is the purpose of the checksum; are you anticipating single-bit errors in transmission, or are you trying to solve some other problem?
    You ever try a pink golf ball, Wally? Why, the wind shear on a pink ball alone can take the head clean off a 90 pound midget at 300 yards.

  4. #4
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    Code:
    int sum = ASCIIEncoding.ASCII.GetBytes("This is a string!").Select(b => (int)b).Sum();
    Console.WriteLine(sum);
    Gives me: 1517
    If you understand what you're doing, you're not learning anything.

  5. #5
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    Quote Originally Posted by itsme86 View Post
    Code:
    int sum = ASCIIEncoding.ASCII.GetBytes("This is a string!").Select(b => (int)b).Sum();
    Console.WriteLine(sum);
    Gives me: 1517
    This worked great thanks.
    Now I have a string called dataPacket that I send over serial to another device. It must be sent as a string as shown below.


    Code:
    int sum = ASCIIEncoding.ASCII.GetBytes("This is a string!").Select(b => (int)b).Sum();
    int checkSum = ~sum; //Do the 1's complement
    
    string dataPacket = (DP1 + DP2 + DP3 + DP4 + DP5 + checkSum); //data to be sent out.
    but since checkSum is of type int I can't send it over and get an error. I've tried converting checkSum to a string using string s = Convert.ToString(checkSum); but get the wrong data sent over. It just converted the checkSum to a string "-1518" which is incorrect. It should've sent over the hex value FA 12

  6. #6
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    You can convert it to hex like this:
    Code:
    string hexString = checkSum.ToString("X");
    If you understand what you're doing, you're not learning anything.

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