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What is the best way to read text files ?

Posted on 1998-10-31
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Last Modified: 2013-11-20
Asked that question long times ago,
and got the answer to do it with CStdioFile something like this:

CStdioFile file;
if(!file.Open(log_file_name,CFile::modeRead|CFile::typeText)) return;

  TCHAR buffer[1024];
  while (file.ReadString(buffer,1024)!=0);
  file.Close();

But there is always a very disturbing \n linefeed-sign at the end of each line.

So I tried it with CArchive::ReadString something like this:

char txt[SDR_MAXTXT];
if (ar.ReadString(txt,count)!=NULL);

and so on, but with some texts I got problem, ReadString returned an error.

So is there a more easier way to read text files, that I didn't know and that I should try ?

Thanks,
bye,
atari
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Question by:atari
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5 Comments
 

Expert Comment

by:jeggy
ID: 1324081
How about including something like (use a CString for the line buffer)

 int iLFPos=csLine.ReverseFind('\n');
 if (iLFPos>=0)
    csLine=csLine.Left(iLFPos);

in the CStdioFile solution after reading the line ?
0
 
LVL 1

Author Comment

by:atari
ID: 1324082
Sorry, I have implemented something like this:

char *CutReadString(char *buffer)
{
  int string_length=strlen(buffer);

  if (buffer[string_length-1]=='\n')
      buffer[string_length-1]='\0';

  return buffer;
}

but I think, it is rather slow to read large text files only this way. Maybe there is another solution for reading large text files, that is faster than the CStdioFile::ReadString-method ?
0
 
LVL 86

Accepted Solution

by:
jkr earned 100 total points
ID: 1324083
Simply use 'ReadString()' specifying _no_ buffer size, so the function will remove the LF itself (reading to the '\n' delimiter is the default behaviour, but a given buffer will be filled without removing the delimiting characters).
0
 
LVL 1

Author Comment

by:atari
ID: 1324084
Hi,
I don't know why I implemented the ReadString-function with a buffer, but with a CString it also works and has no \n at the end of the string. Maybe it was the cause, that I was new in MFC when I wrote this and there was an example in online-help:

// example for CStdioFile::ReadString
extern CStdioFile f;
char buf[100];

f.ReadString( buf, 99 );

so I implemented it with a buffer.

Thanks for your help.
Bye atari
0
 
LVL 1

Author Comment

by:atari
ID: 1324085
Hi,
I don't know why I implemented the ReadString-function with a buffer, but with a CString it also works and has no \n at the end of the string. Maybe it was the cause, that I was new in MFC when I wrote this and there was an example in online-help:

// example for CStdioFile::ReadString
extern CStdioFile f;
char buf[100];

f.ReadString( buf, 99 );

so I implemented it with a buffer.

Thanks for your help.
Bye atari
0

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