Thread: Search in a file for some data ???

What is the best way to search for some data in a file.

I have used:


if(seekfile)
{
while(fgets(DataBuffer,(int)sizeof DataBuffer, seekfile) != NULL)
{
sscanf(MobilDataBuffer,"%d %d",tempone, temptwo);
if(num== tempone)
{
*answer = OK;
return 0;
}
}
}
return *answer;

I need to find a number in the file, and when I find it, It shall send back a yes or no, if the number is found in the file.

What i the best way to do this..
Tx hope to get some help...

Gugge


Ps: And by the way, how do I turn on the thing, so when I'm writing code, it looks fine istead of this #¤"¤¤#.....??

Here's a couple of ways to do it.

This first way is looking for numbers specifically.

Code:

#include <stdio.h>

#define SEARCH_FOR_NUM 10

int main(void)
{
	FILE *fp;
	int i, j;
	
	if ((fp = fopen ("test.txt", "r")) == NULL)
	{
		perror ("test.txt");
		return 1;
	}
	
	while ((j = fscanf(fp, "%d", &i)) != EOF)
	{
		if (j != 1) 
		{
			fgetc(fp); 
			continue;
		}
		
		if (i == SEARCH_FOR_NUM) printf ("Found it!\n");
	}
	
	fclose (fp);
	
	return 0;
}

Or you could look for strings this way:

Code:

#include <stdio.h>
#include <string.h>

#define SEARCH_FOR_STR "10"

int main(void)
{
	FILE *fp;
	char buf[1024]; /* choose appropriate size */
	
	if ((fp = fopen ("test.txt", "r")) == NULL)
	{
		perror ("test.txt");
		return 1;
	}
	
	while (fgets(buf, 1024, fp))
	{
		if (strstr(buf, SEARCH_FOR_STR))
			printf ("Found it!\n");
	}
	
	fclose (fp);
	
	return 0;
}