Information Technology Tips

Just a simple code tips for saving image as JPEG or PNG format in C#. Save image as JPEG with Quality parameter public static readonly ImageCodecInfo JPEG_CODEC = GetEncoderInfo("image/jpeg"); public static void SaveImageAsJpeg(this Image src, string fileName, int quality) { var eps = new EncoderParameters(1); var ep = new EncoderParameter(Encoder.Quality, quality); eps.Param[0] = ep; src.Save(fileName.ChangeExtension("jpg"), JPEG_CODEC, eps); } public static ImageCodecInfo GetEncoderInfo(string mineType) { return ImageCodecInfo.GetImageEncoders().First(enc => enc.MimeType == mineType); } Save image as PNG public static void SaveImageAsPng(this Image src, string fileName) { src.Save(fileName.ChangeExtension("png"), ImageFormat.Png); }

// Default parameters are almost the highest quality setting. public static Bitmap Resize(this Image src, int w, int h, SmoothingMode smoothingMode = SmoothingMode.AntiAlias, InterpolationMode interpolationMode = InterpolationMode.HighQualityBicubic, PixelOffsetMode pixelOffsetMode = PixelOffsetMode.HighQuality) { var newImage = new Bitmap(w, h); using (var gr = Graphics.FromImage(newImage)) { gr.SmoothingMode = smoothingMode; gr.InterpolationMode = interpolationMode; gr.PixelOffsetMode = pixelOffsetMode; gr.DrawImage(src, 0, 0, w, h); } return newImage; } // resize image based on given percentage public static Bitmap ResizedByPercentage(this Image src, double percent) { var rW = (int)Math.Round(src.Width * percent, 0); var rH = (int)Math.Round(src.Height * percent, 0); return src.Resize(rW, rH); } // resize image limited in given w, h parameter public static Bitmap ResizeImageIn(this Image src, int w, i

private static readonly Regex META_TAG_CHARSET_REGEX = new Regex(@"<META\s+http-equiv\s*=\s*Content-Type\s+content=\s*""[^""]*\s+charset\s*=\s*(?<charset>[^""\s]*).*""\s*>", RegexOptions.IgnoreCase | RegexOptions.Compiled); public static string ExtractCharset(string htmlText) { string result = null; var m = META_TAG_CHARSET_REGEX.Match(htmlText); if (m.Success) { result = m.Groups["charset"].Value; } return result; } Note: System.Text.RegularExpressions.Regex class is thread safe according to this msdn doc .

Hey guys! I wrote small utility method for loading swf, jpg, png etc. in ActionScript 3.0. public static function loadFromURL(url:String):Loader { var img:Loader = new Loader(); img.load(new URLRequest(url)); return img; } public static function loadFromFile(path:String):Loader { var img:Loader = new Loader(); img.loadBytes(IOUtils.readByteData(path)); return img; } public static function load(url:String, format:String):URLLoader { var loader:URLLoader = new URLLoader(); loader.dataFormat = format; loader.addEventListener(Event.COMPLETE, completeHandler); loader.load(new URLRequest(url)); function completeHandler(event:Event):void { loader.removeEventListener(Event.COMPLETE, completeHandler); //trace(event.target.data); } return loader; }

Hey guys!! This post show you how to use XPath in C#. I wrote program for formatting rss feed (xml) to html for its example. XPath in C# The simplest way is just creating XmlDocument and call SelectNodes method. var xmlString = "some xml string...." // create XmlDocment var doc = new XmlDocument(); doc.LoadXml(xmlString); // selecting nodes by xpath string doc.SelectNodes("/rss/channel/item"); RSS Xml to Html Example Okay here is a simple XPath example - converting rss xml to html. using System.IO; using System.Web.UI; using System.Web; namespace Utility { public class RSStoHtmlWriter : HTMLWriteHelper { private readonly string url; public RSStoHtmlWriter(string url) { this.url = url; } public override void WriteBody(HtmlTextWriter htmlWriter) { using (var reader = new XmlTextReader(url)) { // **** using XPath!! **** // As you n

I sometimes faces build fail for AIR application. Most of the time, the cause is incorrect xml namespace in application.xml You should double check the version of air namespace ("3.1" in the example below) <application xmlns="http://ns.adobe.com/air/application/3.1">

I wrote tiny utility method - which is for extracting values on specific key in array. Code function extractValuesForSpecificKey(array& $sourceArray, $key){ $retArray = array(); foreach ($sourceArray as $sourceElem){ $retArray[] = $sourceElem[$key]; } return $retArray; } Example $source = array( array('id' => 1, 'name' =>'Joe'), array('id' => 2, 'name' =>'Chris'), ); $result = extractValuesForSpecificKey($source, 'id'); var_dump($result); The result should be: array(2) { [0]=> int(1) [1]=> int(2) }