Read HTML File

jestges · #1 13-Sep-2007, 02:42

Hi is there anyway to read a html file using c program.

Thank you,

Uten · #2 13-Sep-2007, 04:49

Yes, html files are text files and most tutorials in C includes a section on reading such files.

But my guess is that you should refrain your question a bit to get the answer you want..

jestges · #3 13-Sep-2007, 06:16

thank you for your quick reply can you give me a simple source code to do the thing.

Here is my html file "test.html"

HTML Code:


<html>
<head>
<title>Test docment</title>
</head>
<body>
	<div style="width: 200px; height: 200px; border: 1px solid red;">
	</div>
</body>
</html>

and i want to read all tags by using c program

Thank you

shalombi · #4 15-Sep-2007, 09:51

well with html it is rather simple since tags are clearly delimited from the rest by <> so depending on what you want to do you can count pairs to know how many tags are present or make a list of which tags appear etc...

Open the file and process char by char, compare and sort.

Max

#5 16-Sep-2007, 20:15

Quote:

Originally Posted by jestges

thank you for your quick reply can you give me a simple source code to do the thing.

Here is my html file "test.html"

HTML Code:


<html>
<head>
<title>Test docment</title>
</head>
<body>
	<div style="width: 200px; height: 200px; border: 1px solid red;">
	</div>
</body>
</html>

and i want to read all tags by using c program

Thank you

If you read through the entire file, you will have read all of the tags in the file with the C program!

...it is only WHAT you want to do with the tags after/during reading them that matters! Let's say that you want to print out all of the tags:

CPP / C++ / C Code:

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

void read_html_file( char* filename, char** p_data, int* bytes_read )
{
    long len = 0;
    FILE* p_infile = fopen( filename, "r" );
    if( p_infile )
    {
        if( *p_data != 0 )
        {
            free( *p_data );
        }
        fseek( p_infile, 0L, SEEK_END );
        len = ftell( p_infile );
        rewind( p_infile );
        *p_data = (char*)malloc( len +1 );
        if( *p_data )
        {
            *bytes_read = fread( *p_data, 1, len, p_infile );
            (*p_data)[len] = 0;
        }
        fclose( p_infile );
    }
}

void print_tags( char* p_data )
{
    char* p;
    char start_tag = 0;
    for( p = p_data; *p != 0; p++ )
    {
        switch( *p )
        {
            case '<':
                start_tag = 1;
                putchar( '<' );
                break;
            case '\n':
            case '\r':
            case '\t':
                break;
            case '>':
                putchar( '>' );
                printf( "\n" );
                start_tag = 0;
                break;
            default:
                if( start_tag )
                {
                    printf( "%c", *p );
                }
                break;
        }
    }
}

void usage()
{
    printf( "Usage: read_html <filename>\n\n" );
}

int main( int argc, char* argv[] )
{
    char* p_data = 0;
    int   bytes_read = 0;

    if( argc < 2 )
    {
        usage();
    }
    else
    {
        read_html_file( argv[1], &p_data, &bytes_read );
        if( p_data != 0 )
        {
            if( bytes_read > 0 )
            {
                print_tags( p_data );
            }
            free( p_data );
        }
    }
    return 0;
}

Output:

Code:

$ ./read_html
Usage: read_html <filename>

$ ./read_html /tmp/test.html
<html>
<head>
<title>
</title>
</head>
<body>
<div style="width: 200px; height: 200px; border: 1px solid red;">
</div>
</body>
</html>

...might get you started.

:davis:

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