Reading a file in C language

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Hi,

I have a file which has the contents as follows :
S# Name From To Train# DOJ Fiar
1 Srikumar COCHIN KOLKATTA 12515 12/12/2012 530

Now, I need to get only the columns From, To and DOJ.

I have tried,

fscanf(fp,"%s,%s,%s",frm,to,doj);

But it is showing the first 3 columns.

And I need to store the date in to an array.

Please help.

Posted 18-Nov-12 23:12pm

srmohanr

Updated 18-Nov-12 23:28pm

v2

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3 solutions

Solution 3

Cannot you simply discard the info you don't need?
e.g.

C

int s; // will be discarded
// use 'large-enough' buffers.
char n[0x20]; // will be discarded
char f[0x20];
char t[0x20];
int d;


if ( fscanf(fp, "%d %s %s %s %d", &s, n, f, t,&d) != 5)
{
  // handle error
}

printf("from %s to %s doj %d\n", f, t, d);

Posted 18-Nov-12 23:56pm

CPallini

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Andy411 · Accepted Answer · 2012-11-18T23:29:00

fscanf works as designed. It takes the first three strings.

I have two options:
1)
Add "dummys" like

C++

fscanf("%s %s %s %s %s %s", dummy1, dummy2, from, to, dummy3, doj);

Allways pay attention on the buffer size of your target strings!

2)
Read the whole line with fgets() and seperate the string with srtok

You can find more on strok here e.g. http://www.cplusplus.com/reference/clibrary/cstring/strtok/[^]

Richard MacCutchan · Accepted Answer · 2012-11-18T23:49:00

Solution 2

You can use the * specification to skip fields that you are not interested in. You should also use the width specification to limit the number of characters read for any field, to guard against buffer overrun. Something like:

C++

char szFrom[32];
char szTo[32];
char szDOJ[12];
int nFieldCount = fscanf(fpInput, "%*s %*s %32s %32s %*s %12s %*s", szFrom, szTo, szDOJ);

I'm not sure what you mean by "I need to store the date in to an array.".

Posted 18-Nov-12 23:49pm

Richard MacCutchan

Comments

srmohanr 19-Nov-12 5:57am

Thanks for your help man. Please omit the later part.

CPallini 19-Nov-12 6:18am

Wow, a trick I didn't know.
My 5.

Richard MacCutchan 19-Nov-12 6:47am

I only discovered it recently while researching on MSDN.

Mohibur Rashid 19-Nov-12 7:47am

+5, interesting