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Convert extern string into double with array?

  • #1
  • First Post: Sep 21, 2014 12:46pm Sep 21, 2014 12:46pm
Hi,

I have a quick question for coders who can help.

This is the line code that I want to use and which works fine:

Quote
Double WhichDay[] = {0, 1, 2, 3, 4, 5, 6};

My problem comes when I want to use it as an external variable:

Quote
extern double WhichDay[] = {0, 1, 2, 3, 4, 5, 6};

I have this error message:

Quote
objects and arrays are not allowed as inputs

Does anybody know how it would be possible to get this input as an external variable?

My first idea is to have the external variables as a string:

Quote
extern string WhichDay = "0, 1, 2, 3, 4, 5, 6";

But then I don’t know how and if it is possible to convert the string into a double with arrays to get this result:

Quote
Double WhichDay[] = {0, 1, 2, 3, 4, 5, 6};

I hope I am clear.

Thanks for your help.
Best,
G
  • #2
  • Sep 21, 2014 4:42pm Sep 21, 2014 4:42pm
Use StringSplit
Please Do Not PM Me With Coding Enquiries
  • #3
  • Sep 21, 2014 9:06pm Sep 21, 2014 9:06pm
Quoting I-trade
Hi, I have a quick question for coders who can help. This is the line code that I want to use and which works fine: {quote} My problem comes when I want to use it as an external variable: {quote} I have this error message: {quote} Does anybody know how it would be possible to get this input as an external variable? My first idea is to have the external variables as a string: {quote} But then I don’t know how and if it is possible to convert the string into a double with arrays to get this result: {quote} I hope I am clear. Thanks for your help....
This should give you some ideas, I have used the symbol ";" as the separator but you could use "," or ":" or "_" etc. hope this helps

Attached File(s)
File Type: mq4 string array test.mq4   3 KB | 470 downloads
Trade what you see not what you hope
  • #4
  • Last Post: Sep 22, 2014 4:33am Sep 22, 2014 4:33am
Many many thanks for your help guys.

You can find below what I have done, if it can help some other guys in the future.

This code allow me to setup the trading hours for each day of the week and e.g. to start an EA accordingly.

Quote
//+--------------------------------------------------------------------------+
//| Global variables |
//+--------------------------------------------------------------------------+

int td = TimeDayOfWeek(TimeLocal() );

string TheWeek[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
double WhichDay[] = {0, 1, 2, 3, 4, 5, 6};

extern string WhichHourStartAMs = "8,8,8,8,8,8,8";
string WhichHourStartAM[];
double StartHourAM;

Quote
//-----------------------------------------------------------------------------
// function: TradingHourByDay ()
// Description: Check the trading hours
//-----------------------------------------------------------------------------
void TradingHourByDay()
{
string sep=","; // A separator as a character
ushort u_sep; // The code of the separator character
u_sep=StringGetCharacter(sep,0);
int k=StringSplit(WhichHourStartAMs,u_sep,WhichHourStartAM);

StartHourAM = StartAMCheck(td);

}//End TradingHourByDay()


Quote
double StartAMCheck(string day)
{

for ( int i = ArraySize(WhichDay)-1; i >=0; i-- )
if (StringFind(day,WhichDay[i],0) != -1)
return (WhichHourStartAM[i]);
return(0);
}//End double StartAMCheck
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