//+------------------------------------------------------------------+
//| Demo_FileWriteInteger.mq4 |
//| Copyright 2014, MetaQuotes Software Corp. |
//| https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2014, MetaQuotes Software Corp."
#property link "https://www.mql5.com"
#property version "1.00"
#property strict
//--- show the window of input parameters when launching the script
#property script_show_inputs
//--- parameters for receiving data from the terminal
input string InpSymbolName="EURUSD"; // Currency pair
input ENUM_TIMEFRAMES InpSymbolPeriod=PERIOD_H1; // Time frame
//--- parameters for writing data to the file
input string InpFileName="Trend.bin"; // File name
input string InpDirectoryName="Data"; // Folder name
//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart()
{
double close_buff[];
datetime time_buff[];
int size;
//--- set indexing as timeseries
ArraySetAsSeries(close_buff,true);
ArraySetAsSeries(time_buff,true);
//--- reset the error value
ResetLastError();
//--- copy the close price for each bar
if(CopyClose(InpSymbolName,InpSymbolPeriod,0,1000,close_buff)==-1)
{
PrintFormat("Failed to copy the values of close prices. Error code = %d",GetLastError());
return;
}
//--- copy the time for each bar
if(CopyTime(InpSymbolName,InpSymbolPeriod,0,1000,time_buff)==-1)
{
PrintFormat("Failed to copy time values. Error code = %d",GetLastError());
return;
}
//--- get the buffer size
size=ArraySize(close_buff);
//--- open the file for writing the values (if the file is absent, it will be created automatically)
ResetLastError();
int file_handle=FileOpen(InpDirectoryName+"//"+InpFileName,FILE_READ|FILE_WRITE|FILE_BIN);
if(file_handle!=INVALID_HANDLE)
{
PrintFormat("%s file is available for writing",InpFileName);
PrintFormat("File path: %s\\Files\\",TerminalInfoString(TERMINAL_DATA_PATH));
//---
uint byteswritten;// number of bytes written
int up_down=0; // trend flag
int arr_size; // arr array size
uchar arr[]; // uchar type array
//--- write time values to the file
for(int i=0;i<size-1;i++)
{
//--- compare close prices of the current and next bars
if(close_buff[i]<=close_buff[i+1])
{
if(up_down!=1)
{
//--- write date value to the file using FileWriteInteger
StringToCharArray(TimeToString(time_buff[i]),arr);
arr_size=ArraySize(arr);
//--- first, write the number of chars in the array
byteswritten=FileWriteInteger(file_handle,arr_size,INT_VALUE);
//--- checking the number of bytes written
if(byteswritten!=sizeof(int))
{
PrintFormat("Error in FileWriteInteger. Error code=%d",GetLastError());
//--- close the file
FileClose(file_handle);
return;
}
//--- write the chars
for(int j=0;j<arr_size;j++)
{
byteswritten=FileWriteInteger(file_handle,arr[j],CHAR_VALUE);
//--- checking the number of bytes written
if(byteswritten!=sizeof(char))
{
PrintFormat("Error in FileWriteInteger. Error code=%d",GetLastError());
//--- close the file
FileClose(file_handle);
return;
}
}
//--- change the trend flag
up_down=1;
}
}
else
{
if(up_down!=-1)
{
//--- write the date value to the file using FileWriteInteger
StringToCharArray(TimeToString(time_buff[i]),arr);
arr_size=ArraySize(arr);
//--- first, write the number of chars in the array
byteswritten=FileWriteInteger(file_handle,arr_size,INT_VALUE);
//--- checking the number of bytes written
if(byteswritten!=sizeof(int))
{
PrintFormat("Error in FileWriteInteger. Error code=%d",GetLastError());
//--- close the file
FileClose(file_handle);
return;
}
//--- write chars
for(int j=0;j<arr_size;j++)
{
byteswritten=FileWriteInteger(file_handle,arr[j],CHAR_VALUE);
//--- checking the number of bytes written
if(byteswritten!=sizeof(char))
{
PrintFormat("Error in FileWriteInteger. Error code=%d",GetLastError());
//--- close the file
FileClose(file_handle);
return;
}
}
//--- change the trend flag
up_down=-1;
}
}
}
//--- close the file
FileClose(file_handle);
PrintFormat("Data is written, %s file is closed",InpFileName);
}
else
PrintFormat("Data is written, %s file is closed",InpFileName,GetLastError());
} |