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for the programming genius' here:

  • #1
  • First Post: Mar 20, 2009 1:46am Mar 20, 2009 1:46am
yo, this is for the programming genius' here.

Is there a way to have the program to write new values to itself? I want the program to remember new values even after a metatrader or system re-start.
  • #2
  • Mar 20, 2009 2:00am Mar 20, 2009 2:00am
normally you cannot. The only indicators that can are the ones built into mt4. Now, you could save everything to a file and have the indicator check to see if that file is there. If it is, then it will use those values instead of the normal ones.
  • #3
  • Mar 20, 2009 2:07am Mar 20, 2009 2:07am
that just might work...do you know of a tutorial or example I could follow to make that happen?
  • #4
  • Mar 20, 2009 8:48am Mar 20, 2009 8:48am
GlobalVariables are usually saved for ~20 days after being written.

As for the file stuff...

Docs.mql4.com should get you started.
  • #5
  • Mar 23, 2009 8:32pm Mar 23, 2009 8:32pm
Quoting aicccia
yo, this is for the programming genius' here.

Is there a way to have the program to write new values to itself? I want the program to remember new values even after a metatrader or system re-start.
Not exactly sure what you are after here. Like Ron said, Global variables are the easiest way to go, if you don't need to save the information for longer than 3 weeks.

Or...

You could create a dll in c++, that allows an EA to write to an external file on your computer, and then read that file when you need the information.
  • #6
  • Mar 23, 2009 8:42pm Mar 23, 2009 8:42pm
Quoting wolfe
Not exactly sure what you are after here. Like Ron said, Global variables are the easiest way to go, if you don't need to save the information for longer than 3 weeks.

Or...

You could create a dll in c++, that allows an EA to write to an external file on your computer, and then read that file when you need the information.
dll not required for writing to a file. MT4 has several built in functions for writing data to a file.

global variables are kept indefinitely as long as they are accessed at least 1 time per 3 weeks.
  • #7
  • Mar 24, 2009 7:47pm Mar 24, 2009 7:47pm
Quoting magnumfreak
dll not required for writing to a file. MT4 has several built in functions for writing data to a file.

global variables are kept indefinitely as long as they are accessed at least 1 time per 3 weeks.
I was unable to write to an external file (outside of metatrader) without a dll for my application. I know you can write to a file within metatrader with mq4, can you write outside of your terminal without the use of a dll?
  • #8
  • Mar 24, 2009 8:44pm Mar 24, 2009 8:44pm
Quoting wolfe
I was unable to write to an external file (outside of metatrader) without a dll for my application. I know you can write to a file within metatrader with mq4, can you write outside of your terminal without the use of a dll?
yep, you are correct you can write to the files folder only. If you want it to go anywhere else you will have to write a dll.
  • #9
  • Last Post: Mar 24, 2009 9:46pm Mar 24, 2009 9:46pm
or use the windows api fileio functions
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