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How to use TextAnalyzer.GetTypographicFeatures method

I need to get the available OpenType features for a given font in my app (C#). I'm using DirectWrite through SharpDX and I'm having a really bad time.
I know that the best solution is to use this method:
SharpDX.DirectWrite.TextAnalyzer2.GetTypographicFeatures
but I don't know how to get a result from it, as I don't know where to get the parameters.
These are the parameters I need to provide in order to get the Font Features:
fontFace FontFace
scriptAnalysis ScriptAnalysis
localName String
maxTagCount int
actualTagCount int
tags FontFeatureTag
Can someone please provide me a better explanation or (ideally) some code. There is almost no documentation about it so I don't know where I can get these parameters and/or what they mean.
Thanks in advance.

I figure it out lastly. Thanks to Buglehead who gave me the final piece of the puzzle.
Here is an example. In this code I first load all system fonts, then get a specific font, and then get the FontFeatureTags for that specific font.
using SharpDX.DirectWrite;
private void LoadFontFeatureTags()
{
Factory f = new Factory(FactoryType.Isolated);
Factory4 _factory = new Factory4(f.NativePointer);
_factory.CreateFontCollectionFromFontSet(_factory.SystemFontSet, out FontCollection1 collection);
List<SharpDX.DirectWrite.FontFamily> loadedFonts = new List<SharpDX.DirectWrite.FontFamily>();
for (int i = 0; i < collection.FontFamilyCount; i++)
{
var family = collection.GetFontFamily(i);
loadedFonts.Add(family);
}
var gabriolaFont = loadedFonts.FirstOrDefault(x => x.FamilyNames.GetString(0).Contains("Gabriola"));
var gabriolaFirstChild = gabriolaFont.GetFont(0);
Font3 f3 = new Font3(gabriolaFirstChild.NativePointer);
f3.CreateFontFace(out FontFace3 face3);
ScriptAnalysis analysis = new ScriptAnalysis();
TextAnalyzer analyzer = new TextAnalyzer(f);
TextAnalyzer2 analyzer2 = new TextAnalyzer2((IntPtr)analyzer);
int maxTagCount = 32;
FontFeatureTag[] featuresArray = new FontFeatureTag[maxTagCount];
analyzer2.GetTypographicFeatures(face3, analysis, "es-US", maxTagCount, out int actualCount, featuresArray);
}

How do I retrieve some of videos details (duration, date, views) from a playlist with YouTube API V3 in one pass

Hello SO folks and more specifically Google folks monitoring this tag per your support page. I am working from .NET and PlaylistItems.List("snippet,contentDetails") does not do a whole lot compared to the old RSS Feed search. In fact adding part contentDetails adds little value in that only the VideoID is now returned but it is already part of Snippet.ResourceId.VideoId
"kind": "youtube#playlistItem",
bla,
bla,
"contentDetails": {
"videoId": "DLME0PsJRnk"
}
Why add a "part" which is only going to return one bit of information?
How about supporting something like "snippet,contentDetails(duration,PublishedAt,Views)"
I feel this is kind of basic metadata (snippet) most apps would want to list to the users.
While you are at it please please remove this non-sense of Java casing of parameters. Why would you leak-out your language of choice into an API, that's really sad. Yes it is frustrating to keep checking whether I case-spelled them correctly.
Well, it looks like you are forcing "us" to build a list of VideoIds than turn around and make more API calls when I was doing it previously with fewer.
It also means, I will have to manage the 50 items max paging twice, once for the playlist if it is over 50 videos and then manage manually my list of VideosIds paging when I turn around to make Videos.List calls.
Let me know if I missed an All-In-One call type of API, thank you.

Here is what I have now working, let me know if there is a better way
// 20150802
public async Task<List<YouTubeInfo>> PlaylistVideosInfo(String PlaylistID)
{
var YoutubeService = YouTubeService();
//
List<YouTubeInfo> VideoInfos = new List<YouTubeInfo>();
//
var NextPageToken = "";
while (NextPageToken != null)
{
//
var SearchListRequest = YoutubeService.PlaylistItems.List("snippet");
SearchListRequest.PlaylistId = PlaylistID;
SearchListRequest.MaxResults = 50;
SearchListRequest.PageToken = NextPageToken;
// Call the search.list method to retrieve results matching the specified query term.
var SearchListResponse = await SearchListRequest.ExecuteAsync();
// Collect Video IDs from this page
var VideoIDsBatch = new List<string>(); // batch Video detail search by 50 max
foreach (var searchResult in SearchListResponse.Items)
{
VideoIDsBatch.Add(searchResult.Snippet.ResourceId.VideoId);
}
// Make API call for this batch - expect a single page :(
var VideoListRequest = YoutubeService.Videos.List("snippet,contentDetails");
VideoListRequest.Id = String.Join(",", VideoIDsBatch);
VideoListRequest.MaxResults = 50;
var VideoListResponse = await VideoListRequest.ExecuteAsync();
// Collect each Video details
foreach (var VideoResult in VideoListResponse.Items)
{
YouTubeInfoAdd(VideoInfos, VideoResult);
}
// request next page
NextPageToken = SearchListResponse.NextPageToken;
}
// Return All Videos' detail
return VideoInfos;
}

Using C#, how do I determine if an uploaded file has any accessible metadata/document properties?

Suppose I have a program which allows a user to upload any kind of file. Along with getting generic information such as file type and file size, I would like to attempt to grab any extra information (such as document properties like author, last revised, etc) that may be transported along with the document.
Since I don't have any knowledge about the incoming document/file ahead of time, I can't simply use classes that are specific to, say Microsoft Office docs. I need to do this generically and then construct a dynamic object or dictionary to hold any found key/value results.
Is this possible? If so, how? Any help is appreciated!

I found a few answers on StackOverflow for this, but none gave me a nice, clean dictionary of document properties. Here is what I finally came up with and it seems to be working nicely (you will need to reference "Microsoft Shell Controls and Automation" from the COM folder and add using Shell32; to your code:
public static Dictionary<string,string> GetDocumentMetadata(string fileName)
{
var properties = new Dictionary<string,string>();
var arrHeaders = new List<string>();
var shell = new Shell();
var objFolder = shell.NameSpace(HttpContext.Current.Server.MapPath("~/RawFiles"));
var file = objFolder.ParseName(fileName);
for (var i = 0; i < short.MaxValue; i++)
{
var header = objFolder.GetDetailsOf(null, i);
if (String.IsNullOrEmpty(header))
break;
arrHeaders.Add(header);
}
for (var i = 0; i < arrHeaders.Count; i++)
{
var value = objFolder.GetDetailsOf(file, i);
if (!String.IsNullOrEmpty(value))
{
properties.Add(arrHeaders[i], value);
}
}
return properties;
}

Html parser to get blog posts

I need to create a html parser, that given a blog url, it returns a list, with all the posts in the page.
I.e. if a page has 10 posts, it
should return a list of 10 divs,
where each div contains h1 and
a p
I can't use its rss feed, because I need to know exactly how it looks like for the user, if it has any ad, image etc and in contrast some blogs have just a summary of its content and the feed has it all, and vice-versa.
Anyway, I've made one that download its feed, and search the html for similar content, it works very well for some blogs, but not for others.
I don't think I can make a parser that works for 100% of the blogs it parses, but I want to make the best possible.
What should be the best approach? Look for tags that have its id attribute equal "post", "content"? Look for p tags? etc etc etc...
Thanks in advance for any help!

I don't think you will be successful on that. You might be able to parse one blog, but if the blog engine changes stuff, it won't work any more. I also don't think you'll be able to write a generic parser. You might even be partially successful, but it's going to be an ethereal success, because everything is so error prone on this context. If you need content, you should go with RSS. If you need to store (simply store) how it looks, you can also do that. But parsing by the way it looks? I don't see concrete success on that.

"Best possible" turns out to be "best reasonable," and you get to define what is reasonable. You can get a very large number of blogs by looking at how common blogging tools (WordPress, LiveJournal, etc.) generate their pages, and code specially for each one.
The general case turns out to be a very hard problem because every blogging tool has its own format. You might be able to infer things using "standard" identifiers like "post", "content", etc., but it's doubtful.
You'll also have difficulty with ads. A lot of ads are generated with JavaScript. So downloading the page will give you just the JavaScript code rather than the HTML that gets generated. If you really want to identify the ads, you'll have to identify the JavaScript code that generates them. Or, your program will have to execute the JavaScript to create the final DOM. And then you're faced with a problem similar to that above: figuring out if some particular bit of HTML is an ad.
There are heuristic methods that are somewhat successful. Check out Identifying a Page's Primary Content for answers to a similar question.

Use the HTML Agility pack. It is an HTML parser made for this.

I just did something like this for our company's blog which uses wordpress. This is good for us because our wordress blog hasn't changed in years, but the others are right in that if your html changes a lot, parsing becomes a cumbersome solution.
Here is what I recommend:
Using Nuget install RestSharp and HtmlAgilityPack. Then download fizzler and include those references in your project (http://code.google.com/p/fizzler/downloads/list).
Here is some sample code I used to implement the blog's search on my site.
using System;
using System.Collections.Generic;
using Fizzler.Systems.HtmlAgilityPack;
using RestSharp;
using RestSharp.Contrib;
namespace BlogSearch
{
public class BlogSearcher
{
const string Site = "http://yourblog.com";
public static List<SearchResult> Get(string searchTerms, int count=10)
{
var searchResults = new List<SearchResult>();
var client = new RestSharp.RestClient(Site);
//note 10 is the page size for the search results
var pages = (int)Math.Ceiling((double)count/10);
for (int page = 1; page <= pages; page++)
{
var request = new RestSharp.RestRequest
{
Method = Method.GET,
//the part after .com/
Resource = "page/" + page
};
//Your search params here
request.AddParameter("s", HttpUtility.UrlEncode(searchTerms));
var res = client.Execute(request);
searchResults.AddRange(ParseHtml(res.Content));
}
return searchResults;
}
public static List<SearchResult> ParseHtml(string html)
{
var doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);
var results = doc.DocumentNode.QuerySelectorAll("#content-main > div");
var searchResults = new List<SearchResult>();
foreach(var node in results)
{
bool add = false;
var sr = new SearchResult();
var a = node.QuerySelector(".posttitle > h2 > a");
if (a != null)
{
add = true;
sr.Title = a.InnerText;
sr.Link = a.Attributes["href"].Value;
}
var p = node.QuerySelector(".entry > p");
if (p != null)
{
add = true;
sr.Exceprt = p.InnerText;
}
if(add)
searchResults.Add(sr);
}
return searchResults;
}
}
public class SearchResult
{
public string Title { get; set; }
public string Link { get; set; }
public string Exceprt { get; set; }
}
}
Good luck,
Eric

Getting the parent name of a URI/URL from absolute name C#

Given an absolute URI/URL, I want to get a URI/URL which doesn't contain the leaf portion. For example: given http://foo.com/bar/baz.html, I should get http://foo.com/bar/.
The code which I could come up with seems a bit lengthy, so I'm wondering if there is a better way.
static string GetParentUriString(Uri uri)
{
StringBuilder parentName = new StringBuilder();
// Append the scheme: http, ftp etc.
parentName.Append(uri.Scheme);
// Appned the '://' after the http, ftp etc.
parentName.Append("://");
// Append the host name www.foo.com
parentName.Append(uri.Host);
// Append each segment except the last one. The last one is the
// leaf and we will ignore it.
for (int i = 0; i < uri.Segments.Length - 1; i++)
{
parentName.Append(uri.Segments[i]);
}
return parentName.ToString();
}
One would use the function something like this:
static void Main(string[] args)
{
Uri uri = new Uri("http://foo.com/bar/baz.html");
// Should return http://foo.com/bar/
string parentName = GetParentUriString(uri);
}
Thanks,
Rohit

Did you try this? Seems simple enough.
Uri parent = new Uri(uri, "..");

This is the shortest I can come up with:
static string GetParentUriString(Uri uri)
{
return uri.AbsoluteUri.Remove(uri.AbsoluteUri.Length - uri.Segments.Last().Length);
}
If you want to use the Last() method, you will have to include System.Linq.

There must be an easier way to do this with the built in uri methods but here is my twist on #unknown (yahoo)'s suggestion.
In this version you don't need System.Linq and it also handles URIs with query strings:
private static string GetParentUriString(Uri uri)
{
return uri.AbsoluteUri.Remove(uri.AbsoluteUri.Length - uri.Segments[uri.Segments.Length -1].Length - uri.Query.Length);
}

Quick and dirty
int pos = uriString.LastIndexOf('/');
if (pos > 0) { uriString = uriString.Substring(0, pos); }

Shortest way I found:
static Uri GetParent(Uri uri) {
return new Uri(uri, Path.GetDirectoryName(uri.LocalPath) + "/");
}

PapyRef's answer is incorrect, UriPartial.Path includes the filename.
new Uri(uri, ".").ToString()
seems to be cleanest/simplest implementation of the function requested.

I read many answers here but didn't find one that I liked because they break in some cases.
So, I am using this:
public Uri GetParentUri(Uri uri) {
var withoutQuery = new Uri(uri.GetComponents(UriComponents.Scheme |
UriComponents.UserInfo |
UriComponents.Host |
UriComponents.Port |
UriComponents.Path, UriFormat.UriEscaped));
var trimmed = new Uri(withoutQuery.AbsoluteUri.TrimEnd('/'));
var result = new Uri(trimmed, ".");
return result;
}
Note: It removes the Query and the Fragment intentionally.

new Uri(uri.AbsoluteUri + "/../")

Get segmenation of url
url="http://localhost:9572/School/Common/Admin/Default.aspx"
Dim name() As String = HttpContext.Current.Request.Url.Segments
now simply using for loop or by index, get parent directory name
code = name(2).Remove(name(2).IndexOf("/"))
This returns me, "Common"

Thought I'd chime in; despite it being almost 10 years, with the advent of the cloud, getting the parent Uri is a fairly common (and IMO more valuable) scenario, so combining some of the answers here you would simply use (extended) Uri semantics:
public static Uri Parent(this Uri uri)
{
return new Uri(uri.AbsoluteUri.Remove(uri.AbsoluteUri.Length - uri.Segments.Last().Length - uri.Query.Length).TrimEnd('/'));
}
var source = new Uri("https://foo.azure.com/bar/source/baz.html?q=1");
var parent = source.Parent(); // https://foo.azure.com/bar/source
var folder = parent.Segments.Last(); // source
I can't say I've tested every scenario, so caution advised.