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Random Useful MQL4 Functions 36 replies

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functions that come in handy 0 replies

Define every MQL4 variables, functions? 4 replies

Attachments: Handy MQL4 utility functions
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Handy MQL4 utility functions

see i m making a grid trading system
n at present m a newbie in mql4 ...
what so far i hav achived is sending autmatic order based on my calculations.
but my system send order again and again....

example
if i run expert it send like this
buy limit 1.40000
buy limit 1.39800
buy limit 1.39600
buy limit 1.39400
buy limit 1.39200
then it start again untill i stop expert
1.40000
...... .. .. ..
1.39200
again..

n i cant use break function as my system will be continues...
so i want a loop in my expert which run after order send ..n remove multiple pending limits

and also

supose if hit 1.40000 its tp is 1.40400 n market moves
to say 1.40200
it again send a limit order at 1.40000
i also want a funtion that this type of order...
it shud only allow 1.4000 newlimit to be send once 1.4000 open order tpis achived n it doestnt exist as an open order
  • Post #22
  • Quote
  • Edited 3:28pm Mar 13, 2011 3:17pm | Edited 3:28pm
Quoting djtejasv
see i m making a grid trading system
n at present m a newbie in mql4 ...
Thanks for taking the time to explain this. However, it sounds complex. I am too busy with other projects to undertake any new outside work, unless the job is very simple (i.e. will take less than 30 minutes to code and test) or I believe it will benefit my own trading in some way.

If you are attempting to do most of the coding yourself, the following link (also here), which explains the MQL4 code needed to create, modify, close and delete orders, might help you.

I've written a package that, among its many features, allows multiple entries at equally spaced levels, and will also allow simultaneous modifying and closing/deleting of multiple open/pending orders. However, it is not an EA, and hence will not babysit your trades for you. And it is not free (it's available through the Commercial forum).

Personally I don't trade grid systems. However, there are many grid systems available at Forex Factory. If you type 'grid' into FF's search engine, you'll likely get a lot of hits. Maybe the programmer who wrote one of them could adapt his grid to suit your requirement.
i dont think its that complex ... if we hav a verbal talk ... i can expln u more.... i dont mind paying...it will hardly take a few hours...
Thank you so much, David!
I've updated the "code" section is post #1 to the latest list of functions. There are now more than 70 utility functions available.

There's also an index of functions at the end.

David
  • Post #26
  • Quote
  • Edited 2:08am Nov 25, 2011 12:46am | Edited 2:08am
Hello,

How do I call your StrToIntegerArray function?
I don't know how to set the variable for "int &a[]". How can I print a test for this function?

#include <HandyUtilityFunctions.mqh>
extern string TP="18,46,72";
StrToIntegerArray(TP,??, ",", 0);

//+----------------------------------------------------------------------------+
//| int StrToIntegerArray(string str, int &a[], string delim=",", int init=0)
//+----------------------------------------------------------------------------+
// Breaks down a single string into integer array 'a' (elements delimited by 'delim')
// e.g. string is "1,2,3,4,5"; if delim is "," then the result will be
// a[0]=1 a[1]=2 a[2]=3 a[3]=4 a[4]=5
// Unused array elements are initialized by value in 'init' (default is 0)
//+----------------------------------------------------------------------------+
int StrToIntegerArray(string str, int &a[], string delim=",", int init=0)
{
for (int i=0; i<ArraySize(a); i++)
a[i] = init;
int z1=-1, z2=0;
if (StringRight(str,1) != delim) str = str + delim;
for (i=0; i<ArraySize(a); i++) {
z2 = StringFind(str,delim,z1+1);
a[i] = StrToNumber(StringSubstr(str,z1+1,z2-z1-1));
if (z2 >= StringLen(str)-1) break;
z1 = z2;
}
return(StringFindCount(str,delim));
}
Quoting Subgenius
Hello,

How do I call your StrToIntegerArray function? .....
Sorry, I only saw your post now. I don't subscribe to threads.

Anyway, if you're still around, here is the answer to your question:

Inserted Code
  int TP_array[3];
  string TP = "18,46,72";
  StrToIntegerArray(TP,TP_array);
  MessageBox(DebugIntegerArray(TP_array));
That copies the content of string TP into the first three elements of the array TP_array, and then outputs the array content in a message box, as a check:
[0]=18.00,[1]=46.00,[2]=72.00

David
New version uploaded, see post #1 for details.
found incorrect result for MathFix function.

try rounding up to zero decimal for value of 123.456.

i get 123.000
Quoting DraGon504
found incorrect result for MathFix function.

try rounding up to zero decimal for value of 123.456.

i get 123.000
Function is working correctly.
Values lower than 123.5 are rounded down to 123.000
Values higher than 123.5 are rounded up to 124.000

If you want to round up all values greater than (for example) 123.000 to 124.000, use MathFix(x+0.49999999)
good job,thanks
Mean Reversion
Quoting cardo
good job,thanks
Thanks for the feedback.

I've just uploaded the latest version, which includes 3 new functions, bringing the total to 83 functions. See post #1 for details.

David
Dear hanover,

Just to say thanks for your good contributions on FF some of us do appreciate them.

Cheers
Ati
Money is important, Love is essential.
Quoting Ati Baia
Dear hanover,

Just to say thanks for your good contributions on FF some of us do appreciate them.

Cheers
Ati
Ati,

Thanks for the feedback. Much appreciated.

David
Hi all,

I wanted to create a database to manage user of my EAs. Does anyone have similar system? The attached overview pdf shown what I have in mind. Thanks for any guidance.
Attached File(s)
File Type: pdf Mt4Overview.pdf   65 KB | 908 downloads
Quoting nvn2005
Hi all,

I wanted to create a database to manage user of my EAs. Does anyone have similar system? The attached overview pdf shown what I have in mind. Thanks for any guidance.
I suggest that you start a new thread, or post in one of the "I code your indicator/EA for free" threads. This thread has low visibility, and other programmers possibly expect the thread originator to deal with requests in their own thread. However, I am a commercial developer: please refer to this post for more info.
Strange behavior with MT4 build 445

Just a note of warning, the MathFactorial() function seems to cause MT4 build 445 to crash, hence you might like to delete it from the .mqh file. It seems to work OK on earlier builds.

The nature of the crash is not that severe: MT4 simply shuts itself down. This occurred on a WinXP SP3 computer, AxiTrader MT4 build 445.

What is even stranger is that, even if the function is not called anywhere in the code (i.e. the MQL4 compiler gives a "Function MathFactorial is not referenced and will be removed from the exp-file" warning message), the crash still occurs! Weird!

The function is recursive, i.e. calls itself, which may be part of the problem. When I rewrote it using a for() loop, the crash no longer occurs.

Just a heads up.

David
Quoting hanover
Strange behavior with MT4 build 445

Just a note of warning, the MathFactorial() function seems to cause MT4 build 445 to crash, hence you might like to delete it from the .mqh file. It seems to work OK on earlier builds.

The nature of the crash is not that severe: MT4 simply shuts itself down. This occurred on a WinXP SP3 computer, AxiTrader MT4 build 445.

What is even stranger is that, even if the function is not called anywhere in the code (i.e. the MQL4 compiler gives a "Function MathFactorial is not referenced and will be removed...
maybe try adding a couple of more functions, or even just copy paste and rename existing ones. you might have hit some type of limit in a lookup table that might still keep all addresses listed even if the code is removed and has no valid address. if adding more code busts mt4 then that's probably all it is and metawhatever needs to rethink their shit.
Congratulations ScalaFX for coming out of the closet!
Quoting nubcake
maybe try adding a couple of more functions, or even just copy paste and rename existing ones. you might have hit some type of limit in a lookup table that might still keep all addresses listed even if the code is removed and has no valid address. if adding more code busts mt4 then that's probably all it is and metawhatever needs to rethink their shit.
Thanks. I'll continue to experiment with these types of ideas, and see if I can ascertain what's causing the problem.
Just saying THANK YOU HANOVER, for sharing.

I am trying to tweak OutputHistory indic to output object description for vertical lines on whole chart.

Thank you again,

May the Force be with you,

Simon
S love nia
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