PROBLEM CODE - Indices - MQL4 and MetaTrader 4

[Deleted] 2013.10.17 18:44 #1

I have also created the following expert, but does not show me the data like the previous script

//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
//| expert initialization function                                   |
//+------------------------------------------------------------------+
int init()
  {
//----
   start();
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| expert deinitialization function                                 |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
 
 void export() 
{ 

string file="export_"+Symbol()+"_"+Period()+".csv"; 
int f=FileOpen(file,FILE_CSV|FILE_WRITE,","); 
if(f<1) { Alert("File opening error"); return(0); }
for(int i=Bars-1;i<=0;i--)
{
FileWrite(f,TimeToStr(Time,TIME_DATE|TIME_MINUTES),Open,High,Low,Close ,iFractals(Symbol(),0,1,i),iFractals(Symbol(),0,2,i),iCustom(Symbol(), 0,"ZigZag",0,i),iCustom(Symbol(),0, "ZigZag",1,i));
}


Alert("Export "+Symbol()+" finished. Exported: "+Bars+" records");  
FileFlush(f); 
FileClose(f); 
}

//+------------------------------------------------------------------+
//| expert start function                                            |
//+------------------------------------------------------------------+
int start()
  {
export();

//----
//Alert(ArraySize(norepeats) + ArraySize(morerepeats));
   return(0);
 }
//+------------------------------------------------------------------+

Simon Gniadkowski 2013.10.17 19:47 #2

burnssss:

I want to download historical OHLC, fractals and zigzag indicator, using this script, but when I opened the csv, I have not any information.

Can anyone tell me the error there?

Please use the Forum search . . .

https://www.mql5.com/en/forum/147170

. . . and the documentation

[Deleted] 2013.10.17 21:01 #3

I have combined in this way, and it gives me error. Do not understand why I get the file without any data

//#property copyright ""
//#property link      ""

//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  {
export();
  }

//+------------------------------------------------------------------+
void export() 
{ 

string file="export_"+Symbol()+"_"+Period()+".csv"; 
int f=FileOpen(file,FILE_CSV|FILE_READ,","); 
if(f<1) { Alert("File opening error"); return(0); }
for(int i=Bars-1;i<=0;i--)
{
FileWrite(f,TimeToStr(Time,TIME_DATE|TIME_MINUTES),Open,High,Low,Close ,iFractals(Symbol(),0,1,i),iFractals(Symbol(),0,2,i),iCustom(Symbol(), 

0,"ZigZag",0,i),iCustom(Symbol(),0, "ZigZag",1,i));
}


Alert("Export "+Symbol()+" finished. Exported: "+Bars+" records");  
FileFlush(f); 
FileClose(f); 
}

Sergey Dzyublik 2013.10.17 23:25 #4

1) >=

for(int i=Bars-1;i<=0;i--)

2) FILE_WRITE or FILE_READ|FILE_WRITE

FileOpen(file,FILE_CSV|FILE_READ,",");

3) Do you know about EMPTY_VALUE (ZZ and Fractals may have it) ??? (Empty values are not drawn or shown in the DataWindow. By default, empty value is EMPTY_VALUE)

4) At file closing, the data are flushed to the disk automatically, so there is no need to call the FileFlush() function before calling of the FileClose() function.

Working with files. Buffer Question FILE_READ | FILE_WRITE Question?

[Deleted] 2013.10.18 06:41 #5

I made those changes, and the file gets me only one fact:

1970.01.01 00:00,,,,, 0,0,0,2147483647.

I can think of nothing more

//#property copyright ""
//#property link      ""

//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  {
export();
  }

//+------------------------------------------------------------------+
void export() 
{ 

string file="export_"+Symbol()+"_"+Period()+".csv"; 
int f=FileOpen(file,FILE_READ|FILE_WRITE,","); 
if(f<1) { Alert("File opening error"); return(0); }
for(int i=Bars-1;i>=0;i--)
{
FileWrite(f,TimeToStr(Time,TIME_DATE|TIME_MINUTES),Open,High,Low,Close ,iFractals(Symbol(),0,1,i),iFractals(Symbol(),0,2,i),iCustom(Symbol(), 

0,"ZigZag",0,i),iCustom(Symbol(),0, "ZigZag",1,i));
FileClose(f);
}


Alert("Export "+Symbol()+" finished. Exported: "+Bars+" records");  
FileClose(f); 
}

Simon Gniadkowski 2013.10.18 06:52 #6

burnssss:

I made those changes, and the file gets me only one fact:

1970.01.01 00:00,,,,, 0,0,0,2147483647.

I can think of nothing more

If you open a file, write to it, close it, then open it again to write some more data where will the new data be written to ? what place in the file ?

Tjipke de Vries 2013.10.18 07:09 #7

A few hours before you opened this topic

another topic opend with also your subject

didn't you read it ?? Saving chart data to file

[Deleted] 2013.10.18 07:11 #8

RaptorUK:
If you open a file, write to it, close it, then open it again to write some more data where will the new data be written to ? what place in the file ?

In the code, I think I use the right steps. I think you should download all the data in a file. Csv, but do not understand why I do this.

[Deleted] 2013.10.18 07:17 #9

I tried creating a expert, more or less similar code, and I write a file eg monthly data

1970.01.01 00:00,,,,,0,0,0,2147483647

1970.01.01 00:00,,,,,0,1.1614,0,2147483647

1970.01.01 00:00,,,,,0,0,0,2147483647

1970.01.01 00:00,,,,,1.4104,0,0,2147483647

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.1688,0,0

1970.01.01 00:00,,,,,1.2495,0,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.1192,0,0

1970.01.01 00:00,,,,,1.2315,0,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.1069,1.1069,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.2894,0,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.3161,0,0,1.3161

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.2351,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.4535,0,1.4535,1.4535

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.3,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.3353,1.2596,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.0344,1.0344,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.1537,0,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.0608,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.1216,0,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,0,1.079,0,0

1970.01.01 00:00,,,,,0,0,0,0

1970.01.01 00:00,,,,,1.2401,0,1.2401,1.2401

But no more download data from 1970.

The code we used was as follows:

//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
//| expert initialization function                                   |
//+------------------------------------------------------------------+
int init()
  {
//----
   start();
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| expert deinitialization function                                 |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
 
 void export() 
{ 

string file="export_"+Symbol()+"_"+Period()+".csv"; 
int f=FileOpen(file,FILE_CSV|FILE_WRITE,","); 
if(f<1) { Alert("File opening error"); return(0); }
for(int i=Bars-1;i>=0;i--)
{
FileWrite(f,TimeToStr(Time,TIME_DATE|TIME_MINUTES),Open,High,Low,Close ,iFractals(Symbol(),0,1,i),iFractals(Symbol(),0,2,i),iCustom(Symbol(), 0,"ZigZag",0,i),iCustom(Symbol(),0, "ZigZag",1,i));
}


Alert("Export "+Symbol()+" finished. Exported: "+Bars+" records");  
FileClose(f); 
}

//+------------------------------------------------------------------+
//| expert start function                                            |
//+------------------------------------------------------------------+
int start()
  {
export();

//----
//Alert(ArraySize(norepeats) + ArraySize(morerepeats));
   return(0);
 }
//+------------------------------------------------------------------+

[ARCHIVE!] Any rookie question, Any rookie question, so historical datas and/or csv

Simon Gniadkowski 2013.10.18 07:17 #10

burnssss:

In the code, I think I use the right steps. I think you should download all the data in a file. Csv, but do not understand why I do this.

You didn't answer my simple question, where in the file do you want to place the new data ? if you think about that for a few minutes it will help you . . .