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file append

  • #1
  • First Post: May 26, 2008 4:16pm May 26, 2008 4:16pm
hi, im writing an EA to parse a years worth of data to give me highs/lows for each day etc and dump to a csv.

my code is fairly standard. open a file for appending, into a handle, write to it, then close.

only problem is, its not 'appending' to the csv. Its overwriting each time so i only get one line in the csv, instead of like 365 lines (one for each day).


PHP Code
 fh = FileOpen("my_data.csv",FILE_READ|FILE_WRITE,';');
   if(fh<1)
    {
     Print("File my_data.dat not found, the last error is ", GetLastError());
     return(false);
    }
 FileWrite(fh, i,iHigh(NULL,PERIOD_H1,i));
Any ideas?
I thought
PHP Code
FILE_READ|FILE_WRITE
would be append mode??
Thanks
J
  • #2
  • May 26, 2008 7:02pm May 26, 2008 7:02pm
I'm not sure, but try this
(maybe you have to position the file pointer to end-of-file):

int handle;
handle = FileOpen(sFileName, FILE_READ|FILE_WRITE|FILE_CSV, ";");
bRtn = FileSeek(handle, 0, SEEK_END);

Perhaps a more experienced MT programmer can correct me if I'm wrong. Thanks.
  • #3
  • May 26, 2008 8:39pm May 26, 2008 8:39pm
don't open the file each time through the loop. Open the file prior to entering the loop and then write the data inside. Once the loop is done, then close the file.
  • #4
  • Last Post: May 27, 2008 3:57am May 27, 2008 3:57am
Thanks magnumfreak. I wasnt doing that but i do appreciate the help!

Quoting Kenz987
I'm not sure, but try this
(maybe you have to position the file pointer to end-of-file):

int handle;
handle = FileOpen(sFileName, FILE_READ|FILE_WRITE|FILE_CSV, ";");
bRtn = FileSeek(handle, 0, SEEK_END);

Perhaps a more experienced MT programmer can correct me if I'm wrong. Thanks.
You, sir, are a legend! Thanks so much. That was my problem. Most other language ive dealt with (perl, python) automagically move the file pointer to end of file when in append mode, so i just thought mql would do the same.

Thanks again
J
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