//+------------------------------------------------------------------+
//|                                                Demo_FileCopy.mq5 |
//|                        Copyright 2013, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2013, MetaQuotes Software Corp."
#property link      "http://www.mql5.com"
#property version   "1.00"
//--- display the window of input parameters when launching the script
#property script_show_inputs
//--- input parameters
input string InpSrc="source.txt";       // source
input string InpDst="destination.txt";  // copy
input int    InpEncodingType=FILE_ANSI; // ANSI=32 or UNICODE=64
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//--- display the source contents (it must exist)
   if(!FileDisplay(InpSrc))
      return;
//--- check if the copy file already exists (may not be created)
   if(!FileDisplay(InpDst))
     {
      //--- the copy file does not exist, copying without FILE_REWRITE flag (correct copying)
      if(FileCopy(InpSrc,0,InpDst,0))
         Print("File is copied!");
      else
         Print("File is not copied!");
     }
   else
     {
      //--- the copy file already exists, try to copy without FILE_REWRITE flag (incorrect copying)
      if(FileCopy(InpSrc,0,InpDst,0))
         Print("File is copied!");
      else
         Print("File is not copied!");
      //--- InpDst file's contents remains the same
      FileDisplay(InpDst);
      //--- copy once more with FILE_REWRITE flag (correct copying if the file exists)
      if(FileCopy(InpSrc,0,InpDst,FILE_REWRITE))
         Print("File is copied!");
      else
         Print("File is not copied!");
     }
//--- receive InpSrc file copy
   FileDisplay(InpDst);
  }
//+------------------------------------------------------------------+
//| Read the file contents                                           |
//+------------------------------------------------------------------+
bool FileDisplay(const string file_name)
  {
//--- reset the error value
   ResetLastError();
//--- open the file
   int file_handle=FileOpen(file_name,FILE_READ|FILE_TXT|InpEncodingType);
   if(file_handle!=INVALID_HANDLE)
     {
      //--- display the file contents in the loop
      Print("+---------------------+");
      PrintFormat("File name = %s",file_name);
      while(!FileIsEnding(file_handle))
         Print(FileReadString(file_handle));
      Print("+---------------------+");
      //--- close the file
      FileClose(file_handle);
      return(true);
     }
//--- failed to open the file
   PrintFormat("%s is not opened, error = %d",file_name,GetLastError());
   return(false);
  }
//+------------------------------------------------------------------+