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Running a .exe from MQL4

  • Post #1
  • Quote
  • First Post: Jul 8, 2006 6:08pm Jul 8, 2006 6:08pm
Is it possible ?
Regards
Quoting grusso
Is it possible ?
Regards
Try to call ShellExecute.

Inserted Code
#import "shell32.dll"
  int ShellExecuteA(int hWnd, int lpVerb, string lpFile, int lpParameters, string lpDirectory, int nCmdShow);
#import
MQL4: idea * experience + creative solution
need coding help for 2 things:

1.
the event -- price crosses trigger from below / above :


double myTrigger;

if (Ask crosses myTrigger from below)
{
SendOrder(Symbol(), OP_BUY...);
}

if (Bid crosses myTrigger from above)
{
SendOrder(Symbol(), OP_SELL...);
}

I suppose I will need to access value of previous tick for that:

if (previous_tick < myTrigger && current_tick > my Trigger) {SendOrder(...);}

BUT I couldn't find any way to do that in the documentation and forums. Perhaps, there's another way too...

Kindly guide.

2.
I have an EA that works well as far as the code is concerned.
one of the functions is that it is supposed to update the levels for stoploss, takeprofit and SendOrder trigger values each time a new bar starts.
mostly the update happens efficiently BUT sometimes the update fails for as long as 2 to 3 bars and for that reason, the order gets entered at the old trigger or stopped out at an old S/L level which causes losses.
also, sometimes when I run the EA on multiple charts, I notice that while the update happens on some, it does not on others...I have also used the RefreshRates(); function at critical places in the code.

what possibly causes this inefficiency?
how do I force the EA to make the updates the moment a new bar starts?

Thanks in advance for help.
Quoting pgd
need coding help for 2 things:

1.
the event -- price crosses trigger from below / above :


double myTrigger;

if (Ask crosses myTrigger from below)
{
SendOrder(Symbol(), OP_BUY...);
}

if (Bid crosses myTrigger from above)
{
SendOrder(Symbol(), OP_SELL...);
}

I suppose I will need to access value of previous tick for that:

if (previous_tick < myTrigger && current_tick > my Trigger) {SendOrder(...);}

BUT I couldn't find any way to do that in the documentation and forums. Perhaps, there's another way too...

Kindly guide.

2.
I have...

double myTrigger;
double Askcurrent = iClose(NULL,0,0)+(Ask-Bid);
double Askprevious = iCloseNULL,0,1)+(Ask-Bid);
double Bidcurrent = iClose(NULL,0,0);
double Bidprevious = iClose(NULL,0,1);

if ( Askcurrent > myTrigger && Askprevious < myTrigger )
{
SendOrder(Symbol(), OP_BUY...);
}

if ( Bidcurrent < myTrigger && Bidprevious > myTrigger )
{
SendOrder(Symbol(), OP_SELL...);
}

or

you can use Close[0] +(Ask-bid);
Close[1]+(Ask-Bid);

if you prefer.
Here is an example of something I wrote a while back for someone else.
Notice, that I use the trigger moving thru price rather than price moving thru the trigger. The reason is, you can not know what the spread was in the past unless you build an array to hold the spread. If you do that, you have to syncronize it to your trigger. This way I have done is much easier.

PHP Code
       WRCurrent = iWPR(Symbol(), 0, Williams, 1);
      WRLast    = iWPR(Symbol(), 0, Williams, 2);
      mafast    = iMA(Symbol(), 0,MAFast,0,MODE_EMA,PRICE_CLOSE,1);
      maslow    = iMA(Symbol(), 0,MASlow,0,MODE_EMA,PRICE_CLOSE,1);
      
      if (UseMAFilter)
         {
            if(mafast>maslow) {up = true;down = false;}
            if(mafast<maslow) {up = false;down = true;}
         }
         
      if ( up && WRCurrent > -80 && WRLast < -80 && NoOpenOrders() == false && sellsareopen )
         {
            CloseTrades(OP_SELL,OP_SELLLIMIT,OP_SELLSTOP);
            sellsareopen = false;
         }    
      if ( up && WRCurrent > -80 && WRLast < -80 && NoOpenOrders() && Hour() >= StartTrading && Hour() < StopTrading && timenow != Time[0] )
         {
            price = High[1]+(Ask-Bid)+(OffsetPips*Point);
            Buy(price);
            buysareopen = true;
            timenow = Time[0];   
         }
               
      if ( down && WRCurrent < -20 && WRLast > -20 && NoOpenOrders() == false && buysareopen )
         {
            CloseTrades(OP_BUY,OP_BUYLIMIT,OP_BUYSTOP);
            buysareopen = false;
         }    
      if ( down && WRCurrent < -20 && WRLast > -20 && NoOpenOrders() && Hour() >= StartTrading && Hour() < StopTrading && timenow != Time[0] )
         {
            price = Low[1]-(OffsetPips*Point);
            Sell(price); 
            sellsareopen = true;
            timenow = Time[0];   
         } 
Quoting grusso
Is it possible ?
Regards
#property copyright "Codersguru."
#property link "http://www.forex-tsd.com"

#import "shell32.dll"
int ShellExecuteA(int hwnd,string lpOperation, string lpFile,string lpParameters,string lpDirectory,int nShowCmd );
#import

void pop ( string msg , string installed_dir)

{
ShellExecuteA(0,"Open" ,"pop.exe",msg,installed_dir,1);
}
Quoting smjones
double myTrigger;
double Askcurrent = iClose(NULL,0,0)+(Ask-Bid);
double Askprevious = iCloseNULL,0,1)+(Ask-Bid);
double Bidcurrent = iClose(NULL,0,0);
double Bidprevious = iClose(NULL,0,1);

if ( Askcurrent > myTrigger && Askprevious < myTrigger )
{
SendOrder(Symbol(), OP_BUY...);
}

if ( Bidcurrent < myTrigger && Bidprevious > myTrigger )
{
SendOrder(Symbol(), OP_SELL...);
}

or

you can use Close[0] +(Ask-bid);
Close[1]+(Ask-Bid);

if you prefer.

S M Jones,
Thanks.

sorry for coming back after a lapse of so many days of your response. I was travelling.

I understand your solution is comparing the close of 2 completed bars. tell me if i am wrong. what I want is this:

e.g.
myBuyTrigger = 1.4650
current price = 1.4657

I DON'T WANT to buy as soon as price drops to 1.4650 bcos that wud be hitting the trigger from above.
I WANT to buy AFTER price drops below 1.4650 and then hits the trigger 1.4560 FROM BELOW.
This is going to happen most likely WITHIN THE SAME BAR. So, Close[0], Close[1] will not work for me. I need to access the value of the previous tick (most likely within the same bar).

Thanks.
Dear SM Jones,

Kindly also comment on point 2 of my initial post reproduced below for convenience:

Q u o t e

I have an EA that works well as far as the code is concerned.
one of the functions is that it is supposed to update the levels for stoploss, takeprofit and SendOrder trigger values each time a new bar starts.
mostly the update happens efficiently BUT sometimes the update fails for as long as 2 to 3 bars and for that reason, the order gets entered at the old trigger or stopped out at an old S/L level which causes losses.
also, sometimes when I run the EA on multiple charts, I notice that while the update happens on some, it does not on others...I have also used the RefreshRates(); function at critical places in the code.

what possibly causes this inefficiency?
how do I force the EA to make the updates the moment a new bar starts?

U n q u o t e
Quoting pgd
S M Jones,
Thanks.

sorry for coming back after a lapse of so many days of your response. I was travelling.

I understand your solution is comparing the close of 2 completed bars. tell me if i am wrong. what I want is this:

e.g.
myBuyTrigger = 1.4650
current price = 1.4657

I DON'T WANT to buy as soon as price drops to 1.4650 bcos that wud be hitting the trigger from above.
I WANT to buy AFTER price drops below 1.4650 and then hits the trigger 1.4560 FROM BELOW.
This is going to happen most likely WITHIN THE SAME BAR. So, Close[0], Close[1]...
I think you can start counter for every tick within the same bar. reset when start of new bar.

condition should be:

if(countercurrent>counterprevious && AskPrevious<MyBuyTrigger && AskCurrent>MyBuyTrigger)
Quoting akukaya
I think you can start counter for every tick within the same bar. reset when start of new bar.

condition should be:

if(countercurrent>counterprevious && AskPrevious<MyBuyTrigger && AskCurrent>MyBuyTrigger)
akukaya,

thanks.

I am not much of a coder myself.
would you kindly provide the exact code to achieve this...

thanks again.
  • Post #11
  • Quote
  • Edited 5:54pm Dec 9, 2008 5:30pm | Edited 5:54pm
It's simple.
Request custom Expert Advisor or Indicator: dostapyuk "at" gmail . com
Check out my thread.
http://www.forexfactory.com/showthread.php?t=135619
Request custom Expert Advisor or Indicator: dostapyuk "at" gmail . com
  • Post #13
  • Quote
  • Last Post: May 19, 2021 2:58pm May 19, 2021 2:58pm
Hi,

I have tried to use ShellExecuteA (and ShellExecuteW) in MQL4 but am having issues. There is a related thread at https://www.mql5.com/en/forum/141796#comment_22409167 where I have posted more details relating to the members there.

Is there an example available showing correct usage?

Here was one of my attempts:

Inserted Code
ShellExecuteA(0,"open","notepad.exe",0,0,5); // not working


Is the path input the issue - should this be the full path to notepad.exe e.g.

Inserted Code
ShellExecuteA(0,"open","C:\\WINDOWS\\system32\\notepad.exe",0,0,5);

or

Inserted Code
ShellExecuteA(0,"open","notepad.exe",0,"C:\\WINDOWS\\system32\\",5);


Also, how many parameters can we supply to the .exe using ShellExecuteA?

If we wish to supply more than 1, do we pass them as a string (to be unpacked in the .exe)?

Is it possible to receive output back from the .exe?

Any help would be greatly appreciated.
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