Code question: How to detect a string end postion? | Forex Factory

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Code question: How to detect a string end postion?

  • #1
  • First Post: Aug 2, 2018 6:39pm Aug 2, 2018 6:39pm
Hey all..

I have a string
Inserted Code
<td>6586.97 Lots</td>
.. Im able to get to the first number but how can you then count how many Characters are left in that string..

Wanting to extract the 6586.97 out of that string.. My thought is if you can get the number of characters from the 6 to the end, you can substring and pull the number out...

A. Is that a good way to do it ?
B. How do you get the character count from the 6? (for statement?)
  • #2
  • Aug 2, 2018 10:22pm Aug 2, 2018 10:22pm
It all depends on what programming language you use.
  • #3
  • Edited 3:57am Aug 3, 2018 1:44am | Edited 3:57am
Quoting mtbb
Wanting to extract the 6586.97 out of that string..
A generic code to extract the number from that string (in C; C without the clutter that is ):
Inserted Code
source = "<td>6586.97 Lots</td>"
result = 0.0
i = 0
c = source[0]
while c > 0 && c != '.'
    if c >= '0' && c <= '9'
        result = result * 10 + (c-'0')
    c = source[++i]
if c == '.'
    double m = 0.1
    c = source[++i]
    while c >= '0' && c <= '9'
        result += (c-'0') * m
        m *= 0.1
        c = source[++i]
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  • #4
  • Last Post: Aug 3, 2018 10:45am Aug 3, 2018 10:45am
If you're using MQL and your data is consistently structured this way then the easiest way to accomplish your goal is by splitting the string by the space, trimming the <td> tag, and then casting to double.

Inserted Code
void OnStart()
{
   string test = "<td>6586.97 Lots</td>";
   Print(parsed_td(test));
}
double parsed_td(string td_str)
{
   string splits[];
   if(StringSplit(td_str, ' ', splits) < 1)
      return -1;
   return double(StringSubstr(splits[0], 4));
}
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