Improve company productivity with a Business Account.Sign Up

x
?
Solved

Convert hex string to double

Posted on 2007-11-27
8
Medium Priority
?
4,525 Views
Last Modified: 2010-08-05
double xx=0;
string txt=null;

txt = "0942afc8131d6837";

xx=Double.Parse(txt, System.Globalization.NumberStyles.HexNumber);

this complies fine but when I run the application I get this error "An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll"

Is there a function in C# 2005 that will take a string Hex number and convert it to a double?
0
Comment
Question by:lcrogers
  • 4
  • 2
  • 2
8 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 20361683
there is not, but you can build one by your own:

double hex2double(string hex)
{
        double result = 0.0;
        foreach (char c in hex)
        {
              double val = (double)System.Convert.ToInt32(c.ToString(),16);
              result = result * 16.0 + val;
        }
        return result;
}
0
 
LVL 6

Accepted Solution

by:
Roopesh_7 earned 750 total points
ID: 20361764
Hi friend,
Use below method to convert

double xx = 0;
            string txt = null;
           
            txt = "0942afc8131d6837";

            xx = Convert.ToInt64(txt, 16);
            Response.Write(xx);

0
 

Author Comment

by:lcrogers
ID: 20361813
I need it to be a doule precession number,  this will give me a whole number.
0
What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.

 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 20361951
what do you mean with a double precision number? both examples comply with your question.
0
 
LVL 6

Expert Comment

by:Roopesh_7
ID: 20362008
 string txt = null;
           
            txt = "0942afc8131d6837";

            txt = Convert.ToInt64(txt, 16).ToString("#0.00");

give a string format at the end......

then convert that string to double by convert.todouble(txt );
0
 

Author Comment

by:lcrogers
ID: 20362123
it must be converted to a negetive earth center to earth fix number (exsample: -53512345.3567N, -36512342.3345E;  I am getting these values from a military GPS grid system.

0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 20362412
you have to do it with unsafe code. Assuming both coordinates are inside a single hex:

        unsafe public static void Transform(string hex, out float x, out float y)
        {
            UInt32 x0 = System.Convert.ToUInt32(hex.Substring(0, 8), 16);   // first half of hex code
            UInt32 y0 = System.Convert.ToUInt32(hex.Substring(8, 8), 16);   // last half of hex code

            x = *((float *)&x0);
            y = *((float *)&y0);
        }

Assumming it is just one component:
        unsafe public static void Transform(string hex, out double a)
        {
            UInt64 a0 = System.Convert.ToUInt64(hex16);
            a = *((double *)&a0);
        }


but with the sample hex string you have provided, it doesn't output any valid value as you shown.
Also, you have to take care about the byte ordering (big/little endian)
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 20362416
also you will need to instruct the compiler to allow the unsafe code in the Project Settings.
0

Featured Post

What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

In order to hide the "ugly" records selectors (triangles) in the rowheaders, here are some suggestions. Microsoft doesn't have a direct method/property to do it. You can only hide the rowheader column. First solution, the easy way The first sol…
Hello there! As a developer I have modified and refactored the unit tests which was written by fellow developers in the past. On the course, I have gone through various misconceptions and technical challenges when it comes to implementation. I would…
In response to a need for security and privacy, and to continue fostering an environment members can turn to for support, solutions, and education, Experts Exchange has created anonymous question capabilities. This new feature is available to our Pr…
Watch the video to know the simple way to remove or recover or reset lost or forgotten passwords of Outlook PST file. With Kernel Outlook Password Recovery tool such operation is very easy to perform. It is a freeware with limitation to use with 500…

586 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question