Questions from Beginners MQL5 MT5 MetaTrader 5 - page 275

[Vladimir Karputov]

jommerbot:
Then why is it like that on one machine and different on the other? I transferred sources to %programfiles%\LiteForex MT5\MQL5, I start editor - they are not there (I need to copy them to %appdata%\MetaQuotes\Terminal\0DF37F59A46B215DB2AE3D3D96D0F055\MQL5), but in Windows 7, if sources are placed in %programfiles%\MetaTrader 5\MQL5\ then everything is found and compiled.

The terminal on "7" may have been installed with a Portable key:

Forum on trading, automated trading systems and trading strategy testing

Data Folder location

sergeev, 2010.01.23 13:21

Renat Thank you very much!!!!

I have added /portable to metaeditor.exe shortcut and it has worked. The Data Folder link has now automatically moved to the terminal install folder.

(By the way - I put terminals in Program Files)

Also write in terminal.exe /portable - it's necessary to take data from installation path. And for F4 to open editor in required park too.

I had to explore settings of file type mapping and add /portable to the ".mq5" opening line too.

Now everything works as it should.

[jommerbot]

barabashkakvn:

Maybe the terminal on "7" was installed with a Portable key:

No, I remember exactly that I downloaded and installed from official sourcehttps://www.metatrader5.com/ru/download without any keys, just in case I checked startup shortcuts - no specified keys either... miracles. I now understand how to do it on server 2003 - I just put the key on shortcuts. Thanks.

And by the way, the bilds are the same:

[Vasiliy Sokolov]

jommerbot:
It's just that for me, git is more familiar and convenient than subversion.

There shouldn't be any problems with git. Personally, it works great with mql files for me.

[jommerbot]

And here's another question: why FileIsExist, if the file doesn't exist, then the error 5019 (file doesn't exist) appears, in my opinion it's somehow not logical. I have a tight control in EA initialization:

   if( GetLastError() != ERR_SUCCESS ) {
      return(INIT_FAILED);
   }

I don't want to make separate crutch exceptions for specific errors, maybe there is some other way to check if the file exists?

[Maxim Khrolenko]

jommerbot:

And here's another question: why FileIsExist, if the file doesn't exist, then the error 5019 (file doesn't exist) appears, in my opinion it's somehow not logical. I have a tight control in EA initialisation:

I wouldn't want to make separate crusty exceptions for specific errors, maybe there is some other way to check if the file exists?

Do you have ResetLastError() before reading the error?

[jommerbot]

paladin800:
Do you haveResetLastError() before reading the error ?

So no - that's the point, if there was an error somewhere in the code during initialisation, it would be dangerous to reset it, or am I wrong?

[Maxim Khrolenko]

jommerbot:
So no - that's the point, if an error occurred somewhere in the code during initialization, it would be dangerous to zero it, or am I wrong?

ResetLastError() must be put before call of operation after which error should be read. In the FileOpen example (there, in second part) ResetLastError is before filehandle. Please do the same.

[Andrew Petras]

jommerbot:
So no - that's the point, if there was an error somewhere in the code during initialisation, it would be dangerous to zero it, or am I wrong?

It's more dangerous not to know about it. Print it, then reset it before a new call.

[jommerbot]

But before theFileIsExist section, there is more than one place with a potential error. But everything is logged anyway. I did not know about this function. But this does not solve the problem - the error doesn't occur before calling FileIsExist, it occurs when calling FileIsExist. Anyway, I have done it in a different way, via search. Thanks for the answers.

[Vladimir Karputov]

aleks557:

hello beginner and advanced help solve grade 5 maths problem:)

...

I need to find the arithmetic mean of the offered currencies. how easy would it be to write such an indicator ? .......p.s so far this idea is not intended for any trading purposes but purely educational in nature

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