stringreplacemql4metatrader4

MQL4 StringToDouble always returns zero

The function StringToDouble always returns zero on passing a variable string. Let me demonstrate ...

This is what I have so far.

string balance = "12.50USD";
// lets extract the double only from the string
int x = StringReplace(balance,"USD",""); // now we have a plain number
    
Print(balance); // "12.50"
double balance_only = StringToDouble(balance); 
Print(balance_only) ; // Zero? Why?

Well according to the documentation here and here

This is supposed to work? Right? What am I missing?

I even tried to add empty strings on the sides to trick the function but still

double b = StringToDouble(StringConcatenate("",balance,"")); 
Print(b); // Zero , Why :(

What seems to be the problem here?

Solution

  • After installing and unistalling a couple of MT4 instances,

    It was there all along, For some reason I was also using StringSplit function i.e

    StringSplit(extracted_balance_string," ", &results[]);

    Instead of

    StringSplit(extracted_balance_string,StringGetCharacter(" ",0), &results[]); // the space was a special character

    I missed that, my bad :D