Read more than one line in a file

This is a discussion on Read more than one line in a file within the C Programming forums, part of the General Programming Boards category; Is there a way to read from a text file, more than the first line? I tried fgets, but I ...

  1. #1
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    Read more than one line in a file

    Is there a way to read from a text file, more than the first line?
    I tried fgets, but I don't know how to continue on the next line, fscanf screws up if it encounters a space ' '. I just need to find a way to get this done.
    can anyone help?
    Last edited by sea_4_ever; 08-26-2007 at 01:43 AM. Reason: missed a word

  2. #2
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    Don't answer all at once!
    really.

  3. #3
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    this isn't irc, have patience.

    why not just call fgets again?

  4. #4
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    Wow, 28 minutes, and you complain you didn't get an answer. Might I echo the same sentiments as robwhit and suggest some patience?

    Or how about something better. If you're going to complain that we haven't done your work for you in less than half an hour, how about you apply your energy and impatience to researching it youself?

    What's wrong with calling fgets() in a loop? Or as the condition?

    Code:
    char szBuffer[BUFSIZ];
    FILE *somefile;
    
    ...  /* Assume somefile has been initialized and is a valid, open file for reading. */
    
    while(fgets(szBuffer, sizeof(szBuffer), somefile))
    {
    	/* process data read into szBuffer */
    }
    If you want to quit when you read a certain line, break when you encounter it.

  5. #5
    and the hat of sweating
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    If you want to read the whole file, just use fread():
    Code:
    #include <stdio.h>
    #include <malloc.h>
    
    int main()
    {
    	long length;
    	char* buf;
    	size_t bytes;
    	FILE* file = fopen( "c:/file.txt", "rb" );
    
    	if ( file == NULL )
    	{
    		printf( "Error opening file!" );
    		return 1;
    	}
    
    	if ( fseek( file, 0, SEEK_END ) != 0 )
    	{
    		fclose( file );
    		printf( "fseek() failed!" );
    		return 2;
    	}
    
    	if ( (length = ftell( file )) < 0 )
    	{
    		fclose( file );
    		printf( "ftell() failed!" );
    		return 3;
    	}
    
    	if ( fseek( file, 0, SEEK_SET ) != 0 )
    	{
    		fclose( file );
    		printf( "fseek() failed!" );
    		return 2;
    	}
    
    	if ( (buf = malloc( length + 1 )) == NULL )
    	{
    		fclose( file );
    		printf( "malloc() failed!" );
    		return 4;
    	}
    
    	if ( (bytes = fread( buf, 1, length, file )) != (size_t)length )
    	{
    		free( buf );
    		fclose( file );
    		printf( "fread() didn't read &#37;d bytes!", length );
    		return 5;
    	}
    
    	fclose( file );
    	buf[length] = '\0';
    	printf( "Text file contents:\n%s", buf );
    	free( buf );
    
    	return 0;
    }
    Last edited by cpjust; 08-26-2007 at 04:17 PM. Reason: Oops, forgot to free( buf )...

  6. #6
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    Alright, I have a something working, thanks for all the help.
    Now, I JUST figured out the "get input without pressing enter" thing, and have a good idea of how it works, now to practice it, I need to make some kind of game using the directional keys to navigate.
    Any ideas on an easy game to make?
    I was thinking some kind of Maze, or tic-tac-toe.

  7. #7
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    Code:
    #include <malloc.h>
    use stdlib.h instead. malloc.h is not standard.
    Code:
        FILE* file = fopen( "c:\\file.txt", "rb" );
    Quote Originally Posted by sea_4_ever View Post
    I need to make some kind of game using the directional keys to navigate.
    http://faq.cprogramming.com/cgi-bin/...&id=1043284392

  8. #8
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    robwhit, I already know how.
    I just need to think of what game to make.

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