how read a specified line from a file

galamagalama · #1 19-Jul-2004, 15:10

hello!
I'm doing some file i/o programmes for my webpage, but i'm stuck at one prob...
i'm working in C

i know i can read the whole file(text) with _fgets_ command,
but i'd like to read only, i.e. 2nd line, in the file.

is that possible?
tnx!

dsmith · #2 19-Jul-2004, 15:44

Hello galamagalama and welcome to GIDForums.

Unless I am mistaken, fgets should only read up to the newline in a file.

Code:

fgets()  reads  in  at  most one less than size characters
       from stream and stores them into the buffer pointed to  by
       s.  Reading stops after an EOF or a newline.  If a newline
       is read, it is stored into the buffer.  A '\0'  is  stored
       after the last character in the buffer.

So, fgets should only read one line at a time.

So, quickly off the top of my head (and untested...

)

CPP / C++ / C Code:

fp = fopen("filename.ext","r");

while( fgets(buffer,MAXSIZE,fp) && lineno)
  lineno--;

fclose(fp);

If I am thinking right, buffer should contain the text at "lineno" after running that.

HTH,
d

galamagalama · #3 19-Jul-2004, 16:02

weeeeeeeeee, it's working
but only for line one in the file...

how could it work for line 2, 3,...etc?

galamagalama · #4 19-Jul-2004, 16:05

Quote:

Originally Posted by galamagalama

weeeeeeeeee, it's working
but only for line one in the file...

how could it work for line 2, 3,...etc?

nevermind that, i figure it out!
many tnx!

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