Edit /skins/yourskin/_skin.class.php file

function display_init()
{
	global $blog, $disp;
	
	// call parent:
	parent::display_init();

	if( $blog == 332 && $disp == 'single' )
	{
		// If requested blog is #332 and it's a single post
		add_headline('<meta property="og:image" content="http://the-image-linked-to-post">');
	}
}

You should already have this file in your skin folder. If not, find similar skin and copy that file from it, make sure you edit the class name.

Okay thanks.
but http://the-image-linked-to-post should be dynamic, the thumbnail of photoblog post image sth like
<meta og:image content="post->linked_image"> or
<meta og:image content="post->small_avatar">

Is there sth like "add_headline" that we can use in index.main or posts.main.php ? Because we have to generate different og tags for every post in the post loop.

The $Item object is available in single mode. You may try this

if( $blog == 332 && $disp == 'single' )
{   // If requested blog is #332 and it's a single post
	if( !empty($Item) )
	{	// Make sure the Item is loaded
		if( $FileList = $Item->get_attachment_FileList(20) )
		{	// Get 20 attached files (there might be non-images so we try them all)
			while( $File = & $FileList->get_next() )
			{	// Loop through attached files
				if( $File->exists() && $File->is_image() )
				{	// Got an image
					$url = $File->get_url();
					break;
				}
			}
		}
	}
	
	if( !empty($url) )
	{
		add_headline('<meta property="og:image" content="'.$url.'">');
	}
}

You can get post avatar the same way

you missed the 5th } above, added that, but still not working

The last 5th } should be at the very bottom, and it's there unless you already edited my reply.

Anyway, I will check that

Ok, I found a problem. You are using PHP 4.4.9 which is very old. See if you can select PHP 5 in your hosting control panel.

Disregard that, wrong topic :)

sam2kb wrote:

The $Item object is available in single mode. You may try this

if( $blog == 332 && $disp == 'single' )
{   // If requested blog is #332 and it's a single post
	if( !empty($Item) )
	{	// Make sure the Item is loaded
		if( $FileList = $Item->get_attachment_FileList(20) )
		{	// Get 20 attached files (there might be non-images so we try them all)
			while( $File = & $FileList->get_next() )
			{	// Loop through attached files
				if( $File->exists() && $File->is_image() )
				{	// Got an image
					$url = $File->get_url();
					break;
				}
			}
		}
	}
	
	if( !empty($url) )
	{
		add_headline('<meta property="og:image" content="'.$url.'">');
	}
}

do i insert this in skin.class.php, inside

	function display_init()
	{

after

		// call parent:
		parent::display_init();

Or inside template files ?

The code goes in _skin.class.php as I noted before
http://forums.b2evolution.net/viewtopic.php?p=112586#112586

sam2kb wrote:

The code goes in _skin.class.php as I noted before
http://forums.b2evolution.net/viewtopic.php?p=112586#112586

Yea i assumed so, but it doesnt work.

- - -

The one in the below post works though, but it doesnt actually do any good since it doesnt get any attached image or anything.

http://forums.b2evolution.net/viewtopic.php?p=112586#112586

Add $Item to globals.

global $blog, $disp, $Item;

Yea forgot that.It works now in single mode.As we cannot declare multiple og tags in one page, afaik, it's impossible to do this for "posts" page.

So, Now i have to find a way to display blog in single mode by default.As i mentioned here.

http://forums.b2evolution.net/viewtopic.php?p=112408#112408

You can display one post per page, however you can't just force 'single' mode if no target post requested.

What you need is rewrite the code I posted to get the first Item from MainList rather than using a global $Item object.

Something like this

if( $blog == 332 && !empty($MainList) && $MainList->results_num_rows > 0 )
{   // If requested blog is #332 and we have some posts to display
    if( $Item = $MainList->get_first() )
    {    // Get the first (and the only in our case) Item
        if( $FileList = $Item->get_attachment_FileList(20) )
        {    // Get 20 attached files (there might be non-images so we try them all)
            while( $File = & $FileList->get_next() )
            {    // Loop through attached files
                if( $File->exists() && $File->is_image() )
                {    // Got an image
                    $url = $File->get_url();
                    break;
                }
            }
        }
    }
    
    if( !empty($url) )
    {
        add_headline('<meta property="og:image" content="'.$url.'">');
    }
}

untested

Then setup the blog to display 1 post per page

sam2kb wrote:

You can get post avatar the same way

your above worked pretty good for the photoblog, how can i get the post avatars to display right ?

Try this

if( $blog == 332 && !empty($MainList) && $MainList->results_num_rows > 0 )
{   // If requested blog is #332 and we have some posts to display
    if( $Item = $MainList->get_first() )
    {    // Get the first (and the only in our case) Item
        if ( isset($GLOBALS['avatars_Plugin']) )
		{	// Avatars plugin enabled
			if( ($avatar = $GLOBALS['avatars_Plugin']->get_avatar( 'post', $Item->ID )) !== NULL )
			{	// Get post avatar
				$url = $avatar['url'];
			}
		}
    }
    
    if( !empty($url) )
    {
        add_headline('<meta property="og:image" content="'.$url.'">');
    }
}

seems to work, thanks