Reading CSV from a file into global variables

[DrBeardface]

Hi guys,

I wrote this bit of code based on a discussion I found on a different thread. But I can't seem to get it to work. Basically I have an on deinit function that dumps 8 different varaibles as CSV to a file. I know that bit works because I can obviously read the file. Then I also have an on init function that reads those values into an array that I will then use to get them back into the variable slots that they came out of. Trouble is I can't get the file reading to work properly. I'm using FileReadDouble, but I think I'm doing something wrong. Here is the code.

int init()
{   
FileName = StringConcatenate(Symbol(),".txt");
   
int Vars[8];
int Count = 1;
FileHandle = FileOpen(FileName,FILE_CSV|FILE_READ);
   
while (!FileIsEnding(FileHandle) && Count < 8)
   {
   FileSeek(FileHandle,Count,SEEK_SET);
   Vars[Count] = FileReadDouble(FileHandle,DOUBLE_VALUE);
   Count++;
   }
Print(Vars[1],Vars[2],Vars[3],Vars[4],Vars[5],Vars[6],Vars[7],Vars[8]);
}

int deinit()
{
MemDump = 1;
FileName = StringConcatenate(Symbol(),".txt");
FileHandle=FileOpen(FileName, FILE_CSV|FILE_WRITE, ',');
if(FileHandle>0)
  {
  FileWrite(FileHandle, EntryPrice, ExitPrice, Profit, BuyorSell, LimitBuy, LimitSell, LTProfit, MemDump);
  FileClose(FileHandle);
  }
}

Would you mind taking a look and making suggestions as to why it's not working?

Thanks

[Anthony Garot]

DrBeardface:

This doesn't answer your question, but . . . had you considered using Terminal Globals?

https://www.mql5.com/en/docs/globals

If you need the vars sent to a file, then you need it; but if you don't, this may work out for you.

[Fernando Carreiro]

DrBeardface: I wrote this bit of code based on a discussion I found on a different thread. But I can't seem to get it to work. Basically I have an on deinit function that dumps 8 different varaibles as CSV to a file. I know that bit works because I can obviously read the file. Then I also have an on init function that reads those values into an array that I will then use to get them back into the variable slots that they came out of. Trouble is I can't get the file reading to work properly. I'm using FileReadDouble, but I think I'm doing something wrong. Here is the code.

Would you mind taking a look and making suggestions as to why it's not working?

Read the documentation again:

FileReadDouble

Reads a double-precision floating point number (double) from the current position of the binary file.

FileReadNumber

The function reads from the CSV file a string from the current position till a separator (or till the end of a text string) and converts the read string to a value of double type.

[DrBeardface]

Fernando Carreiro:

Read the documentation again:

Ahh thanks. That makes a lot more sense. It's working a little better now, but still behaving a bit strangely. Here is what I have now.

   FileName = StringConcatenate(Symbol(),".txt");
   
   int Vars[8];
   int Count = 1;
   FileHandle = FileOpen(FileName,FILE_CSV|FILE_READ, ",");
   
   while (!FileIsEnding(FileHandle) && Count <= 8)
      {
      FileSeek(FileHandle,Count,SEEK_SET);
      Vars[Count] = FileReadNumber(FileHandle);
      Count++;
      }
   Print(Vars[1],Vars[2],Vars[3],Vars[4],Vars[5],Vars[6],Vars[7],Vars[8]);

Now when the program initialises it prints "000255000". Whereas it should print "002500001". I looked at the text file generated by the FileWrite function that I posted earlier, and the problem isn't with that, it's seems that something is wrong with the file pointer? Any ideas?

[William Roeder]

Yes there is "something is wrong with the file pointer." You changed it. Stop seeking. Just read the numbers.

[DrBeardface]

Oh ok, I didn't realise that it would remember the file position. It's fixed now. Thanks guys!!