PHP

File Upload in Silverlight – a Simple Solution

Recently I wanted to implement a very simple file upload component in Silverlight that uploads a single file and if possible shows upload progress. Having done some search I’ve found numerous examples but all of them seemed too complex for the simple task of uploading a file so I implemented a really lightweight solution. The source code can be downloaded from here: SimpleFileUpload_v2.zip

Uploading files in Silverlight

Uploading files is quite an easy one in Silverlight: it’s basically just a request made to another server and the file contents are passed in this request. A possible way of implementing this is by using the WebClient class:

private void UploadFile()
{
FileStream _data; // The file stream to be read
string uploadUri;
 
byte[] fileContent = new byte[_data.Length]; // Read the contents of the stream into a byte array
int bytesRead = _data.Read(fileContent, 0, CHUNK_SIZE);
 
WebClient wc = new WebClient();
wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
Uri u = new Uri(uploadUri);
wc.OpenWriteAsync(u, null, new object[] { fileContent, bytesRead }); // Upload the file to the server
}
 
void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e) // The upload completed
{
if (e.Error == null)
{
  // Upload completed without error
}

Upload Progress Indicator

The above solution does the job of uploading the file well. However it does not indicate file upload progress at all: when uploading large files or when having slow internet connection this behaviour would be desirable.

Silverlight has no built-in way to monitor the number of bytes sent which means that the only way to indicate upload progress is sending the file to the server in multiple, smaller chunks. Of course this behaviour needs support from the server side as well.

The idea is that multiple calls are made to the server, every call submitting the next chunk of the file. On the server these chunks are appended to the file.

Read More…

Drupal addons vs Sense/Net features

Recently I’ve been creating a list of useful addons for Sense/Net which the community would find useful. To get an idea I started looking at some open source CMS projects with heavy community participation. I started the list with Drupal and to my surprise among the top 40 extensions I found plenty of which are core features of Sense/Net. These are the following:

  • Views
  • Content Construction Kit
  • Pathauto
  • ImageField, FileField
  • Webform

You can read the full article on the Sense/Net devblog.

How to resample images – a simple algorithm

When working with images I sooner or later usually run into the problem of creating thumbnails. Resampling images is not really difficult in the major programming languages however I have not found built-in support for caclulating thumbnail dimensions neither in .NET nor in PHP. And it seems that this made me re-invent the wheel over and over again creating codes with various lengths just for this simple task.

In Sense/Net 6.0, the open source ECMS I am working on I came across the exact same problem: I wanted to resize images, this time on the fly. This time however I decided to do it a bit less complicated as in previous cases and create a clean and simple solution. After a good deal of googling, tutorial reading and planning I came up with a fairly simple and good code snipplet.

Read More…

Building an AJAX Tree control

Recently I’ve been in need to create use a tree control that is capable of doing the following:
- Displays tree items
- Branches can be opened to see children
- The tree is dynamically built to minimize server load

I was sure that there are plenty of solutions out there that I could use. After doing some search I found that the Ext framework offers a control that would be easy to integrate and use. So if you’re interested in how to integrate the Ext tree control with an ASP.NET or PHP backend to have it work like the Ext tree sample, read on.
Read More…

 Scroll to top