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Libraries

CSV file reader for MQL5 - library for MetaTrader 5

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414
Rating:
votes: 5
Published:
2019.02.23 17:01
Updated:
2019.02.23 22:17
\MQL5\Scripts\
Sample.mq5 (3.59 KB)view
\MQL5\Files\
sample.zip (12.67 KB)
\MQL5\Include\
CsvReader.mqh (19.16 KB)view

Usage of the class

1. Set up an array of column descriptions  in an MqlParam array.

   CCsvReader infile; 
   MqlParam example_column_desc[] =
   {
    { TYPE_STRING,   0, 0.0, "symbol" },       // 1. field is string
    { TYPE_DOUBLE,   0, 0.0, "contractsize" }, // 2. field is double
    { TYPE_DATETIME, 0, 0.0, "expiration" }    // 3. field is datetime
   }; 
   infile.FieldDesc(example_column_desc);


2. Open the file with the Open() function

   infile.Open(InpFileName, FILE_READ);

2a. When the file has a header and your are not interested in the contents of the headerline skip it with Readline(void).  

infile.ReadLine();


3. With ReadLine(MqlParam arr) a MqlParam array is filled with values of one text line of the CSV file.

   MqlParam dataline[];
   int fieldsread;
   fieldsread = infile.ReadLine(dataline);
 

Disadvantages of this class

  • this code is not very fast
  • handles only handle Unicode files at the moment. Single byte files are not a development priority.
  • It is possible this code reads a line and notices that EOF is reached at the end of the line.If possible do not  test with IsEnding(), use the return value  of the ReadLine functions instead. The return value will only return FILE_STATE_EOF after the next read. So all records will be processed.

Using the samples

I provided a LibreCalc spreadsheet with 3 sheets. It is a sample that calculate some orders of a pyramid system. The first sheet as exported as CSV file with "Save As...". Use format CSV file with Tab as separator and to use Unicode. Put the CSV file in your <MQL5>\Files directory. The script Sample.mq5 will read the CSV file and print the values of the CSV file.



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