Solved

Convert hex string to double

Posted on 2007-11-27
8
4,045 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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 250 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
Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

 
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

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

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…
Introduction Hi all and welcome to my first article on Experts Exchange. A while ago, someone asked me if i could do some tutorials on object oriented programming. I decided to do them on C#. Now you may ask me, why's that? Well, one of the re…
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

623 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