How to get website header information in C#

Posted by Raffael on 01/05/2013 Posted in C#.Net Tagged C#, c# get headers, c# header http, c# read http response header, c# retrieve information website, c# web response header, c# webclient get header

With the following function you can easily retrieve a list of website headers in C#. The function needs only the url of a webpage to collect the data. If the function is successfully executed, you’ll get a Dictionary, typed as <string, string>, as return value. This Dictionary<string, string> contains all the headers of the webpage, whose url you passed by at function call time.

//Don’t forget to set the using-directive ;)
using System.Net;

//…

public Dictionary getHeaders(string url)
{
//Dictionary which shall contain the header information
Dictionary header = new Dictionary();

//Create webrequest
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

//Create response object
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

//Read all headers from the response
foreach (string headerItem in response.Headers)
{
//Add header to the dictionary
[…]

Download source code of a website in C#

Posted by Raffael on 01/05/2013 Posted in C#.Net Tagged C#, c# parse website, c# screenscrape, crawl website in c#, download html source in c#, download source code of webpage in c#, load html source from webpage in c#, read html source c#

With the help of the follwing short C# snippet, you’re able to receive the html code / source of any website as string. Such a function is useful, for example, if you want to parse some information from a website for later use.
Thus the snippet works, you have to add the following two using directives to the header of your source.

using System.Net;
using System.IO;

The function itself looks like this:

public string getHTML(string url)
{
//Create request for given url
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);

//Create response-object
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

//Take response stream
StreamReader sr = new StreamReader(response.GetResponseStream());

//Read response stream (html code)
string html = sr.ReadToEnd();

//Close streamreader and response
sr.Close();
response.Close();

//return source
return html;
}

A function call could look like this:

getHTML("http://www.code-bude.net");

If you’ve got suggestions or even problems with the snippet, just write a comment.

Send emails in C#

Posted by Raffael on 01/04/2013 Posted in C#.Net, Tutorials Tagged C#, c# email template, c# fake mail, c# fake sender, c# mailmessage, c# mailto, c# system.net.mail html, mail, system.net.mail

Today I’ll show you how to send easily emails in C#. All that is required, comes with the System.Net.Mail namespace.
In order to be able to send email using the subsequent snippets, all you need is the address of a SMTP server and some login data for even those. (Open, i.e. anonymous STMP servers, aren’t eas to find these days.)
To obtain the address of your provider’s SMTP server you should look on the websites of your provider or glance at one of the following three lists ([1] [2] [3]).
If you have found out the server address and your credentials, we can begin.

public void sendMail(string sender, string recipient,
string subject, string message,
[…]

How to easily record from a webcam in C#

Posted by Raffael on 01/02/201311/03/2017 Posted in C#.Net, Tutorials Tagged aforge, aforge webcam, C#, c# web cam code project, c# web camera, c# web camera capture, c# web camera library, c# webcam, capture image web camera c#, csharp web camera, take picture webcam c#

What is the easiest way to use a webcam in C# and record from it? If you search for an answer to this question you’ll find a lot of articles in the internet but most of them are many pages long and very confusing. However that isn’t really necessary. With the aid of the AForge.NET library you can do the given task really easy. Just a few lines of C# code are enough to drive your webcam and capture images from it. In the following I’ll show you how to handle the AForge library.
What do you need?

The AForge.Video.dll together with the AForge.Video.DirectShow.dll
Both dlls can be found on the AForge website inside the “(libs only)” zip-archive.
A simple winforms-application, with a picturebox on its gui
A webcam. For example this one:No products found.
Basic C#-knowledge. If not exists, read this: No products found.

At first you have to reference the both dlls and write the using-statements […]

Compress images with jpeg codec in C#

Posted by Raffael on 12/27/201212/27/2012 Posted in C#.Net Tagged C#, c# image compression, c# image compression code, c# jpeg image compression codec, how to compress images in c#, how to make images smaller in c#, jpeg c#, jpeg codec c#

Today I’ll show you how to compress your images with help of the JPEG-codec in C#. You will be able to choose the grade of compression. So it’s your choice, if the function should produce smaller filesize or better quality of images.

private void CompressImage(Image sourceImage, int imageQuality, string savePath)
{
try
{
//Create an ImageCodecInfo-object for the codec information
ImageCodecInfo jpegCodec = null;

//Set quality factor for compression
EncoderParameter imageQualitysParameter = new EncoderParameter(
System.Drawing.Imaging.Encoder.Quality, imageQuality);

//List all avaible codecs (system wide)
ImageCodecInfo[] alleCodecs = […]