Is there an easy way of getting values from this string?

Question

2.50/5 (2 votes)

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Hi All,

Question is related to one yesterday but I have a string which contain numbers
such as 987654321 yesterday I asked how to reverse it and got a method (thank you!)
to 12345678 I have now discovered it should be displayed as 21436587 the 12 need to displayed as 21 (this is due to some funky firmware coding it is now my issue to get working!) so I have split up the string to be 1 2 3 4 5 6 7 8 using a space as a delimeter could I use a foreach loop to step through and a space as a delimeter along the lines of

C#

 StringBuilder Swap = new StringBuilder();  
string store;
string store_Prev;
string combine;
foreach(string value in Returned_Trim.Split(' '))
{
store_Prev = store;
value = store;
combine = store+store_Prev;
Swap.Append(combine);

}

just hack together the above code in the code box probably lots of syntax errors but you can see (hopefully) what I mean.
Glenn

Posted 23-Jan-13 1:10am

glennPattonWork3

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Comments

sjelen 24-Jan-13 8:42am

Seems like big-endian/little-endian conversion problem.
Why don't you try to fix endianness while reading bytes from the device instead of messing around with strings?

glennPattonWork3 24-Jan-13 8:58am

It is, but I'm not allowed to fix it! this botch is in a product that is out in the field and if I fixed it I'm likely to break software/hardware that is happy. It's the classic "we know this is wrong but make it work!" mutter,mutter

4 solutions

Solution 2

There's no need to Split, this can be done character-by-character from the string:

C#

StringBuilder Swap = new StringBuilder();
int pos = 0;
foreach (char c in Returned_Trim)
{
  if ((pos & 1) == 1)
  {
    Swap.Insert(pos-1, c);
  }
  else
  {
    Swap.Append(c);
  }
  ++pos;
}

Remember that StringBuilder can deal with more types than just string when building.

Posted 23-Jan-13 8:09am

Matt T Heffron

Comments

glennPattonWork3 24-Jan-13 7:48am

I have got the question to work, but it is the wrong question, I have asked a new version today!

Solution 3

If you business rule is simply to reverse the order of every two chars of a string you could use this simple code:

C#

string input = ""123456789;
string output = string.Empty;
for (int i = 0; i < input.Length - 1; i += 2)
     output = string.Format("{0}{1}{2}", output, input[i + 1], input[i]);

If your string is really long I would use StringBuilder like this:

C#

string input = "hdfshfjvsnghvdf4fh12gy5hh2g2h4rtf5htf5bh1xtfh45tfh5f5hf445th46tfh4646t486t3f1htyh84f";
StringBuilder output = new StringBuilder();
for (int i = 0; i < input.Length - 1; i += 2)
     output.AppendFormat("{0}{1}", input[i + 1], input[i]);

Posted 23-Jan-13 8:48am

BC @ CV

Updated 24-Jan-13 5:38am

v9

Solution 1

If that value is fix
then you can use below algorithm
1) Replace 12 from this string to 21
2) Replace 34 from this string to 43
3) Replace 56 from this string to 65
4) Replace 78 from this string to 87

Hope this helps if yes then accept answer and vote it
--RD

Posted 23-Jan-13 1:52am

RDBurmon

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Mike Meinz · Accepted Answer · 2013-01-24T05:54:00

Here is an example of a simple solution:

C#

string strInput = "87654321";
string strOutput = "";
long intOutput = 0;
int x = 0;
// Ensure an even number of digits
if (strInput.Length % 2 != 0) {
    Interaction.MsgBox("Input string must be an even number of hexadecimal characters");
    System.Environment.Exit(0);
}
for (x = strInput.Length - 4; x >= 0; x += -2) {
    strOutput += strInput.Substring(x, 2);
}
strOutput = strInput.Substring(strInput.Length - 2, 2) + strOutput;
try {
    // Use Try block in case strInput did not contain Hexadecimal characters
    intOutput = Convert.ToInt64(strOutput, 16);
} catch (Exception ex) {
    Interaction.MsgBox(ex.Message);
    System.Environment.Exit(0);
}
Interaction.MsgBox(strOutput + "=" + intOutput.ToString());

.
.
This is the code from the example above that moves the characters around as you require:

for (x = strInput.Length - 4; x >= 0; x += -2) {
    strOutput += strInput.Substring(x, 2);
}
strOutput = strInput.Substring(strInput.Length - 2, 2) + strOutput;