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Interesting script?
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let others appraise it

You liked the script? Try it in the MetaTrader 5 terminal

votes: 31
2013.04.15 08:41
2016.11.22 07:32
file.txt (0.1 KB)view

The script opens the text file, analyzes the positions of the strings' start points in this file and displays string text with a random number. To receive the array of the start positions for each string in the file the GetStringPositions() function is written. The function searches the strings' start point considering the type of encoding files that can be specified in the "InpEncodingType" input parameter.

Besides using the FileTell() function, the script also uses the FileGetInteger() function to obtain the type of encoding, the FileIsEnding() function to define the end of the file and the FileSeek() function to move the position of carriage in the file when displaying the string with a random number.


//--- display the window of input parameters when launching the script
#property script_show_inputs
//--- input parameters
input string InpFileName="file.txt";    // file name
input string InpDirectoryName="Data";   // directory name
input int    InpEncodingType=FILE_ANSI; // ANSI=32 or UNICODE=64
//| Script program start function                                    |
void OnStart()
//--- specify the value of the variable for generating random numbers
//--- variables for positions of the strings' start points
   ulong pos[];
   int   size;
//--- reset the error value
//--- open the file
   int file_handle=FileOpen(InpDirectoryName+"//"+InpFileName,FILE_READ|FILE_TXT|InpEncodingType);
      PrintFormat("%s file is available for reading",InpFileName);
      //--- receive start position for each string in the file
      //--- define the number of strings in the file
         //--- stop if the file does not have strings
         PrintFormat("%s file is empty!",InpFileName);
      //--- make a random selection of a string number
      int ind=MathRand()%size;
      //--- shift position to the starting point of the string
      //--- read and print the string with ind number
      PrintFormat("String text with %d number: \"%s\"",ind,FileReadString(file_handle));
      //--- close the file
      PrintFormat("%s file is closed",InpFileName);
      PrintFormat("Failed to open %s file, Error code = %d",InpFileName,GetLastError());
//| The function defines starting points for each of the strings in the file and  |
//| places them in arr array                                                      |
void GetStringPositions(const int handle,ulong &arr[])
//--- default array size
   int def_size=127;
//--- allocate memory for the array
//--- string counter
   int i=0;
//--- if this is not the file's end, then there is at least one string
      return; // the file is empty, exit
//--- define the shift in bytes depending on encoding
   int shift;
//--- go through the strings in the loop
      //--- read the string
      //--- check for the file end
         //--- store the next string's position
         //--- increase the size of the array if it is overflown
         break; // end of the file, exit
//--- define the actual size of the array

Translated from Russian by MetaQuotes Software Corp.
Original code:

Demo_FileSize Demo_FileSize

The script demonstrates the example of using the FileSize() function

Demo_FileReadDouble Demo_FileReadDouble

The indicator demonstrates the example of using the FileReadDouble() function

Demo_FileWriteInteger Demo_FileWriteInteger

The script demonstrates the example of using the FileWriteInteger() function

Demo_FileReadInteger Demo_FileReadInteger

The indicator demonstrates the example of using the FileReadInteger() function