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Query reg file handeling..

P: 22

I am using C language to read a file: row.txt
Can any one plz help me to get number of rows present in a file BEFORE reading a file.
So i can check number of rows and if the rows greater than the array size, i can throw an error.

I just wanted to check row numbers before fscanf function so we can come to know that how many rows are in row.txt file.

Please find my code:

#include <stdio.h>

typedef struct
int a;
int b;

int main()

FILE *fp;
int row=0;
int i=0;
shane array[10];

fp=fopen("row.txt", "r");

if (fp ==NULL)

printf(" File: row.txt not found...\n");


printf("Rows are = [%d]\n",row);

while (fscanf(fp, "%d %d\n",&array[i].a,&array[i].b) != EOF)
printf(" Row No:[%d] and Numbers are: [%d] [%d]\n",row,array[i].a,array[i].b);

printf("Rows are: [%d]\n", row);


PLease help me..:)

Apr 29 '09 #1
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2 Replies

Expert 100+
P: 2,402
It all depends on the format of row.txt. The data format must include some sort of row delimiter. A simple approach would be to scan the file and count those delimiters. A more complex approach would involve verifying that there is no malformed or otherwise invalid data in the file.
Apr 29 '09 #2

Expert Mod 5K+
P: 9,197
Why bother. Use a linked list and just keep adding nodes to the linked list as you read records from the disc file.
Apr 29 '09 #3

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