Mikhail Toptunov 2017.01.06 15:01 #11151

alexsis78:

Remove FILE_CSV, use FILE_ANSI instead if youuse"\n\t" etc.

I need to useFileReadArray to add a new line at a new bar

Alexey Viktorov 2017.01.06 15:12 #11152

Top2n:
Hello, the task is to overwrite a two-dimensional array, in BIN format, will the function recognize a two-dimensional array as input?

FileWriteArray

Or only write separately by rows?

Of course it will read as a two-dimensional array. Sorry, no offense... wouldn't it be easier to write a 2x2 element test array, read it and see?

Mikhail Toptunov 2017.01.06 22:45 #11153

Alexey Viktorov:
Of course it'll read two-dimensional. Sorry, no offense... Wouldn't it be easier to just write a 2x2 element test array, read it and see?

NULL empty values are written to the file.arrayZ is two-dimensional

//+------------------------------------------------------------------+
//| Запись n элементов массива в файл                                |
//+------------------------------------------------------------------+
void WriteData(const int n)
  {
//--- откроем файл
   ResetLastError();
   int handle=FileOpen(path,FILE_READ|FILE_WRITE|FILE_BIN);
   if(handle!=INVALID_HANDLE)
     {
      //--- запишем данные массива в конец файла
      FileSeek(handle,0,SEEK_END);
      FileWriteArray(handle,arrayZ,0,n);
      //--- закрываем файл
      FileClose(handle);
     }
   else
      Print("Failed to open the file, error ",GetLastError());
  }

If I write one dimensional, bin shows hieroglyphs, two dimensional recognizes as NULL one dimensional has written something

Questions from Beginners MQL5 File Functions - FileWriteArray CArray - Load

Alexey Viktorov 2017.01.07 07:52 #11154

Top2n:

NULL empty values are written to the file.arrayZ is two-dimensional

//+------------------------------------------------------------------+
//| Запись n элементов массива в файл                                |
//+------------------------------------------------------------------+
void WriteData(const int n)
  {
//--- откроем файл
   ResetLastError();
   int handle=FileOpen(path,FILE_READ|FILE_WRITE|FILE_BIN);
   if(handle!=INVALID_HANDLE)
     {
      //--- запишем данные массива в конец файла
      FileSeek(handle,0,SEEK_END);
      FileWriteArray(handle,arrayZ,0,n);
      //--- закрываем файл
      FileClose(handle);
     }
   else
      Print("Failed to open the file, error ",GetLastError());
  }

I'm too lazy today and have no time... In documentation, where you've copied this function, they even write array of structures. Does the entire example given in the documentation work, if you don't change it? Check it yourself, if it doesn't work, you have to write to the CD.

Any questions from newcomers Learning and writing together Errors, bugs, questions

Alexander Gandzyuk 2017.01.07 16:05 #11155

Do not use FileWriteArray and FileReadArray sharpeners for purposes for which they are not intended.
These are serialisation functions. If you want to open file in text-readable format - write string to file.
string s = StringFormat("first line: %s\n", first);
s += StringFormat("second line: %s\n", second);
s += StringFormat("third line: %s\n", third);
FileWrite(s);
and so on and so forth.
To read FileRead and parse each line (you have to play around, but you'll have to if you want readability).
Like children, by golly. They expect from a Funky Christmas miracle, like it will do everything nicely, fill it all up and format it )))).
In general, Merry Christmas to all, good luck ))))

Errors, bugs, questions Any questions from newcomers Questions from Beginners MQL5

Mikhail Toptunov 2017.01.09 02:31 #11156

alexsis78:
Do not use FileWriteArray and FileReadArray sharpeners for purposes for which they are not intended.
These are serialisation functions. If you want to open file in text-readable format - write string to file.
string s = StringFormat("first line: %s\n", first);
s += StringFormat("second line: %s\n", second);
s += StringFormat("third line: %s\n", third);
FileWrite(s);
and so on and so forth.
To read FileRead and parse each line (you have to play around, but you'll have to if you want readability).
Like children, by golly. They expect from a Funky Christmas miracle, like it will do everything nicely, fill it all up and format it )))).
In general, Merry Christmas and merry Christmas to all )))).

The serialization will do fine, the array is huge. And readable format is for the first time, to check fidelity of filling.

Mikhail Toptunov 2017.01.09 03:48 #11157

Can you tell me if it's possible to bypass importing a two-dimensional array from csv. by extracting a three (or two) dimensional array from the indicator to the EA?

C DoesFileReadDouble consider a two-dimensional array, if so how?

In general, what operation should be used to convert a csv matrix to an array?

In general, I do not understand how, for example, take an example

ArrayResize(time_buff,size);
      //--- прочитаем данные из файла
      for(int i=0;i<size;i++)
        {
         time_buff[i]=(datetime)FileReadDouble(file_handle);
         ma_buff[i]=FileReadDouble(file_handle);
        }

how this, write the same data in the arraytime_buff[i]andma_buff[i]

example from https://www.mql5.com/ru/docs/files/filereaddouble

And if I have a two-dimensional array, how can I arrange enumeration.

If I useFileReadString, I need to specify length of the string, I need to know number of digits in the string, not cells?

Apparently, I should useFileReadNumber but it's too weird

Документация по MQL5: Файловые операции / FileReadDouble

www.mql5.com

Файловые операции / FileReadDouble - справочник по языку алгоритмического/автоматического трейдинга для MetaTrader 5

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Alexey Viktorov 2017.01.09 06:46 #11158