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0:00

Introduction

1:21

Demo

2:28

Testing

4:36

Importing the DLL

5:16

Writing the code

6:46

Testing the code

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hacking

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hacking mql4

make a messagebox

messagebox in an indicator

00:00:00

hello everybody welcome to this Saturday

00:00:03

session brought to you by the Learning

00:00:05

ql4 school and learning QL 4.com if you

00:00:08

would like to download this video and

00:00:09

the file that were about the right then

00:00:12

by all means subscribe to the YouTube

00:00:14

video archives there you can download

00:00:16

all of our tech tip Tuesdays and

00:00:18

Saturdays sessions subscription is $5 a

00:00:21

month okay so let's talk about the issue

00:00:24

that we are facing when trying to make a

00:00:28

message box work in a custom indicator

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normally it will not because as they say

00:00:36

in their MQL for reference the function

00:00:39

can't be called from custom indicators

00:00:41

because indicators are executed in the

00:00:43

interface thread it shouldn't slow it

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down so I'm not exactly sure exactly

00:00:48

what that means but all I know is it

00:00:50

means message box does not work in a

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custom indicator it'll work in the

00:00:54

script it will work in an expert advisor

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but not in a custom indicator unless you

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do what we're about to do so if you want

00:01:03

to know how to make a message box work

00:01:05

in a custom indicator stay tuned

00:01:09

jim-dandy presents Saturday sessions

00:01:11

brought to you by learning QL for comm

00:01:13

videos all about MQL for coding and

00:01:16

trading Forex

00:01:22

or get started let me say thank you to

00:01:24

my patreon patrons who make this

00:01:26

possible for you guys to watch what

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we're looking at here is code that I

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have written in an indicator and you can

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see that what it says here is if the

00:01:40

period is not equal to the four-hour

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period in other words if someone drops

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this indicator on to something other

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than a four-hour chart it is programmed

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here to pop up a message box that says

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this only works on the four hour time

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frame and then there is a new line that

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says change to the four hour time frame

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and reload and the caption of the

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message box would read that it cannot

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initialize now as I mentioned this will

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not work in a custom indicator you could

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put this exact same code in a script or

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any expert advisor and it would work but

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not in a custom indicator let me show

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you what it does if we were to drop this

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indicator on a on a one-hour chart

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first of all I'll switch to the 4-hour

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chart and we drop it on the chart

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everything's okay and you can see it

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says that it initialized and if we look

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on our chart indeed we do have the

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message box test the message box test

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indicator running but if we were to

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delete this off of the chart and drop it

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on a one-hour chart let's say let me

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clear this out down here we drop this on

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here everything looks the same we drop

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it on there and without explanation it

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is removed it simply says initialization

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failed if we tried to do it again on a

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4-hour chart it works just fine

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but if we were to change timeframes it

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removes our indicator without

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explanation so what we're going to do is

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make it to where during the

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initialization phase of an indicator and

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that's what's important here you don't

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want message box

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just popping up while an indicator after

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it's loaded on the chart while it's

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running

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because as it said it will bring things

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to a halt it will stop your interface

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your mql for interface from running

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while that message box is open so you

00:03:49

don't want to do it after the indicator

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is loaded however we're doing it before

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the indicator loads we're doing it

00:03:56

during the initialization phase and if

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it is not on the proper time frame it

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will jump out of initialization it will

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say initialization failed so how do we

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accomplish this well what we're going to

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do is instead of using meta traders

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built-in message box function we're

00:04:15

going to use windows built-in message

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box function and in order to do that

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we're going to have to import or rather

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include a file if you look over here in

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the files in the include folder you will

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see one called when user 32 dot mqh and

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this is a file let me open it up so that

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you can see it this is a file that

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imports a Windows dll file called user

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32 DLL and these are all of the

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functions that that DLL contains the one

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that we are going to use is message box

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W right there that's the one that we're

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going to use but first of all we have to

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bring in this one user 32 mqh file and

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that is done like this there we have now

00:05:11

included that file with this get before

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this gets compiled now in that file as I

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said we're going to use the message W

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let me compile this we're going to use

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the message box W instead of message box

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and now that I have compiled you can see

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here the option to select message box W

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it's showing me all of the functions

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that's in that user 32 file here message

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box W

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first of all it requires a window handle

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and we're going to get the handle of the

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window the number of the chart that is

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open right now and the way that we're

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going to do this is we're going to use

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the meta traders built-in window handle

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function and it wants you to enter in

00:06:10

the string which is the currency pair

00:06:15

and the time frame so we're just going

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to put in symbol and the time frame

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which is period so this is going to

00:06:26

return us a handle we put that closing

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parenthesis there now you can see the

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next thing it once here is text and this

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is what the message box is going to

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actually say so we'll just cut and paste

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this from this other message box

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function here yeah all of this right

00:06:45

through here and we just well we get the

00:06:48

caption as well fact we can get this

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whole thing why not

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and copy this and bring it up here now

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let's look at what we've got here we've

00:07:00

got the handle we've got what the

00:07:05

message box is actually going to say the

00:07:10

caption of the message box and what kind

00:07:14

of icons it's going to display on the

00:07:16

message box this compiles just fine so

00:07:22

you want to see if it will work for us

00:07:24

let's give it a try here's the message

00:07:29

box test first of all we will load it on

00:07:32

a on a 4-hour chart and you can see that

00:07:36

it's loaded successfully here it is it's

00:07:38

on the chart however let's try loading

00:07:43

it on a one-hour chart when we say okay

00:07:50

we actually get a message box in a

00:07:54

custom indicator this only works on the

00:07:56

four hour time frame change to the four

00:07:59

hour time frame and reload and we say ok

00:08:02

and you can see down here it said it

00:08:04

loaded successfully and then the message

00:08:07

box test initialization failed and it

00:08:11

wasn't until we've said ok that it

00:08:14

actually removed it because everything

00:08:16

comes to a stop when the message box is

00:08:19

open let me show you again here let me

00:08:23

load it on a 4-hour chart right here it

00:08:28

loaded up successfully and initialize

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let me delete all this out of here now

00:08:33

watch what happens with we change

00:08:35

timeframes we get the message box and

00:08:39

you notice down here it just simply says

00:08:42

that it has uninitialized that's when we

00:08:45

took it off of the 4 hour time frame

00:08:48

chart and now a 1 hour time frame chart

00:08:50

has been loaded and it is trying to

00:08:52

initialize it has not initialized yet

00:08:55

but when we say ok watch what happens

00:08:58

down here and we bring this down here

00:09:00

closer to it there when we finally hit

00:09:04

OK it tells us that the initialization

00:09:06

failed

00:09:08

and the message box test has been

00:09:12

removed and of course we can also put a

00:09:13

print line in there that will tell

00:09:16

people you need to change timeframes

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that's how you make a message box pop up

00:09:20

in an indicator and now that you've

00:09:22

found me if you haven't subscribed to

00:09:24

the channel and you like this kind of

00:09:25

stuff make sure you subscribe give it a

00:09:27

thumbs up or if you didn't like to give

00:09:29

it a thumbs down do one of the other but

00:09:31

I thank you for watching and I'll see

00:09:32

you next time pip pip

Description:

Learn mql4 coding at https://learnmql4.com Mql4 has it's limitations. One of them is the inability to use the MessageBox function in a custom indicator. In this video we will do a little hacking to make us a message box appear using the windows user32.dll file. My Expert: Jimdandy Trade Management Tool.. Free download https://www.mql5.com/en/market/product/11862 My Trade Simulator: DownLoad Skill Builder and hone your trading skills. https://www.mql5.com/en/market/product/18682 My simple kindle book at: https://www.amazon.com/How-Hard-Mql4-Programming-Programmnig-ebook/dp/B00QZEI5RA Tip Jar: https://www.paypal.com/paypalme/jimdandy1958 Support the Channel and download videos and files at... https://learnmql4.teachable.com/ and/or...Be a supporter: https://www.patreon.com/JimDandy1958 Subscribe to the 2013 archives and download all of the videos and files you want here.. https://learnmql4.teachable.com/ If you are serious about trading for a living.... Learn to trade here. https://tieronetrading.com/14-day-trial/

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