What is the best way read a txt file?

[ShumingWang]

hi,
I know xharbour has functions:

hfile:=hb_Fuse("ccc.txt")
while !hb_feof()
c1:=hb_freadln()
hb_fskip(1)
end
hb_fuse()
fclose(hfile)
but harbour without.

Are there lists of what functions each harbour libs files includes ?

Regards!
Shuming Wang

[James Bott]

How about just:

cText := memoread( "myfile.txt")

Regards,
James

[demont frank]

James,

I think memoread has a limitation (or at least memoline) : linelength must be less as 254

Frank

[Antonio Linares]

Frank,

MemoRead() is fine but MemoLine() should not be used as it is very slow.

Please review fwh\samples\RE.prg to see how to read lines from text, real fast

[Enrico Maria Giordano]

Frank,

MemoRead() is fine but MemoLine() should not be used as it is very slow.

Please review fwh\samples\RE.prg to see how to read lines from text, real fast

xHarbour offers HB_FReadLine() that should be fast enough.

EMG

[Colin Wisbey]

Antonio,
RE.prg uses TTxtFile which, although I haven't used it, seems to assume each line is already terminated by CRLF. Wouldn't your suggestion only apply if the text file had no "soft" lines (which a normal paragraph would have)?

Col

[Antonio Linares]

Colin,

> RE.prg uses TTxtFile

Thats an old version of samples\RE.prg. The current RE.prg sample does not use TTxtFile and does it in a total different way:

Code: Select all

      cTxtFile = MemoRead( cRCFile )
      nFrom = 1

      while nFrom < Len( cTxtFile )
         cLine = ExtractLine( cTxtFile, @nFrom )
         ...
         SysRefresh()
      end

ExtractLine() is a new FWH function

[nageswaragunupudi]

If we know we are dealing with a text file containing fixed width lines

Code: Select all

for nFrom := 1 to nSize step nLineWidth
   cline := substr( ctext, nfrom, nlinewidth )
next

to extract a particular line number :
cline := substr( ctext, ( nlinenumber- 1 ) * nlinewidth + 1, nlinewidth )

Extractline from FWH and the above code are enough to deal with text files containing variable length lines or fixed width lines.

If we like OOPS we can put the same code in a class.