Create a function to get page link by slug (I do it with categories)

Hi.

I′ve created a function to get a category link by it′s slug on the theme function.php. This is the function:

function cat_link($szKey) {
	$idObj = get_category_by_slug($szKey);
	$id = $idObj->term_id;
	echo get_category_link($id);
}

With that, I can do <?php cat_link('category-slug');?> to get the given category link.

So, I trying to do something like that, but with pages. I already tried those:

function page_link($szKey) {
	$idObj = get_page_by_path($szKey);
	$id = $idObj->term_id;
	echo get_page_link($id);
}

function page_link($szKey) {
	$idObj = get_page_by_title($szKey);
	$id = $idObj->term_id;
	echo get_page_link($id);
}

When I try <?php page_link('page_slug');?>, it gets the last published post on the page link, instead of the given page slug link.

Can someone tell me what i′m doing wrong and how to fix that?