This script functions as an automated data generation and logging tool designed to create a structured CSV file within the MetaTrader platform. Its primary purpose is to systematically generate every possible numerical combination across five different variables and record them into a permanent log.
Core Logic Breakdown
1. Initialization and Cleanup Before beginning its task, the script identifies a specific target file name. It immediately checks for any existing file with that name and deletes it. This ensures that every time you run the script, you are starting with a fresh, clean data set rather than appending new information to old records.
2. The Combinatorial Generation Engine The heart of the script is a "nested loop" structure. Imagine five different categories, each containing three unique values (0, 1, and 2). The script systematically cycles through every possible combination of these values:
- It starts with all zeros and moves through every variation.
- It continues until it has exhausted every mathematical possibility across all five categories.
- For each combination generated, the script creates a unique string of text that labels these numbers against specific currency pairs (such as EURUSD, EURCHF, EURJPY, GBPUSD, and AUDUSD).
3. Data Recording Process Once a specific combination is identified, the script triggers a secondary automated process to save that data:
- File Access: It opens a dedicated communication channel to the target file using a CSV (Comma Separated Values) format, which is easily readable by spreadsheet software like Microsoft Excel.
- Data Placement: It moves the "cursor" to the very end of the file to ensure no previous data is overwritten.
- Writing and Closing: It writes the specific combination string into the file and immediately closes the connection. This "open-write-close" cycle ensures that the data is saved securely and correctly without corrupting the file.
Summary of Outcome
In plain terms, this script acts as a batch generator. Instead of a user manually typing out hundreds of different currency pair combinations, this tool automatically calculates every possible permutation of five variables and saves them into a clean, organized spreadsheet file for later analysis.
//+------------------------------------------------------------------+
//| Class1.mq4 |
//| Copyright © 2008, MetaQuotes Software Corp. |
//| http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2008, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net"
//+------------------------------------------------------------------+
//| script program start function |
//+------------------------------------------------------------------+
int start()
{
//----
string fn1="Class2";
string s1="";
int max1=3;
FileDelete(fn1);
for(int i=0;i<max1;i++)
for(int j=0;j<max1;j++)
for(int k=0;k<max1;k++)
for(int l=0;l<max1;l++)
for(int m=0;m<max1;m++)
{
s1=""+i+""+j+""+k+""+l+""+m+" "+i+"-EURUSD "+j+"-EURCHF "+k+"-EURJPY "+l+"-GBPUSD "+m+"-AUDUSD";
Write2(fn1,s1);
s1="";
}
//----
return(0);
}
//+------------------------------------------------------------------+
int Write2(string filename,string str)
{
//Write log file
int handle;
handle = FileOpen(filename,FILE_READ|FILE_WRITE|FILE_CSV,"/t");
FileSeek(handle, 0, SEEK_END);
//FileWrite(handle,"" + TimeToStr(CurTime(),TIME_DATE|TIME_SECONDS) + ": " + str);
FileWrite(handle,str);
FileClose(handle);
//Print(str);
}
Comments