Can i create round images with asp.net? Please advise. My requirement is to upload any image and get a rounded version of that created bu asp.net. I am using .Net framework 3.5, visual studio .net 2008.
Many thanks in advance.
Drawing and image manipulation with GDI+ is straightforward as the other answers suggested.
But please note this is an unsupported path, as stated by this MSDN article (emphasis added by myself).
Classes within the System.Drawing namespace are not supported for use within a Windows or ASP.NET service. Attempting to use these classes from within one of these application types may produce unexpected problems, such as diminished service performance and run-time exceptions.
I have successfully used GDI+ within an ASP.NET application several times, and have never faced any problems, but I guess it's just good to know.
You can do it with GDI+ at least. A short answer: use .Graphics.SetClip() to set your desired shape and then draw you image. Everything outside the clipping region will be cut away.
Here's an article disussing a method that will bring smoother corners (and even softed edges if you like): http://danbystrom.se/2008/08/24/soft-edged-images-in-gdi/
First of all you have to find yourself a library that can do such thing to an image.
I've found sth on CodeProject http://www.codeproject.com/KB/GDI-plus/rounded_corners.aspx but I'm not sure if this is going to work with asp.net (that's basically a thing that you should google).
Then when you have a library you do your job with uploading a file and when it's uploaded you check the mime-type, try to open it and use the library.
You haven't mentioned whether this is web or not, but have you considered rounding the images with css and/or javascript? Once you remove that image detail you can't get it back! What if the client wants a different clip shape later?
Related
Does anyone have a past experience on implementing a complete image manipulation solution in classical ASP? I need a solution where a user can:
Upload an image
The uploded image is stored on the filesystem (inside or outside wwwroot)
The image is displayed in the browser but it is resized... on-demand
The on-demand resizing is my main problem. In PHP I could use phpThumb library that allows me to specify a filename and max width/height in a query string. The library resizes the images accordingly, in addition, it caches the copy of the image so that next time the same image with same width/height is requested it is served from the cache.
Can I implement such a solution in classical ASP, if possible with open-source components? ImageMagick?
It would appear that ImageMagick has a COM+ component that can be used for this purpose.
Another mature (though I don't think it's free) library that's commonly used for this is AspJpeg.
ASP.net has build-in functions to manipulate images, since most servers serving ASP classic have some version of ASP.net installed, you can rely on it to do the work.
ie:
<img src="resize.aspx?file=/gallery/photo1.jpg&w=300&height=400" />
This post is a little old, but we recently faced the same issues regarding resizing via Classic ASP.
We found a solution which used the VB.NET route, but it didn't do everything we wanted so we adapted it to include features to resize, crop, pad (with colour) and display the resulting jpg out to the screen and / or a file.
We've uploaded our efforts here in a zip file with the script and an example asp file with instructions: http://easierthan.blogspot.co.uk/2013/02/code-tip-3-classic-asp-image-resizer.html
With regards to uploading, we used http://www.freeaspupload.net which seemed to work very well.
I'm interested in using OpenStreetMap in a web application developed using ASP.NET.
Anyone knows if there is a control, library or wrapper for using OpenStreetMap in ASP.NET? (C#, not using Javascript).
Thanks in advance.
I'm not sure whether they have any ASP specific tools, but Cloudmade have lots of tools & API you can use to get OpenStreetMap into your app. It's mostly done on the client though through JavaScript, so I don't think you'll find much in the way of C# tools.
I could be wrong though...
BruTile is a C# library for displaying a slippy map. It can be used on the web, displaying via silverlight.
In my opinion a silverlight requirement is not a sensible choice for a public website, and not very sensible for internal use either from a long term perspective, so this isn't a great solution. But this is the only thing I'm aware of which matches what you're asking for.
"not using Javascript" is a curious restriction, since most embedded web maps use javascript. Perhaps you mean you don't want to work with any javascript, but the website can use it. In which case... I'm still not aware of any C# solution, but a library which wraps OpenLayers or one of the other alternatives, hiding all javascript development from you, would be very feasible. Someone should build such a thing! In the meantime, the javascript to display a slippy map is quite simple I promise :-)
The other approach might be a Static Map Image generating library which fetches tile images, stitches them into a single image and caches it locally for you to display in an <img> tag. Again such a thing would be very feasible (easy!?) to build with C#. Someone should do it! In the meantime you can link to one of those services (e.g the new one from MapQuest) directly from an <img> tag on your site. ...No javascript, and no C# either!
Is there any way where i can create a thumbnail image from a flash movie file(flv /swf) [NOT FROM A VIDEO File ] in ASP.NET ? Any samples of implementation ?
you can use ffmpeg to create thumbnails of the flash video
For .flv you can use ffmpeg to convert parts of the video (e.g. one frame) into an image (sequence)
I've used it as command-line application by calling Process.Start(), but there is at least one wrapper for .NET (I haven't tested it myself):
http://www.codeplex.com/ffmpegdotnet
For .swf I don't know any way to achieve this without some Adobe tool.
for flv it can be done easily, as others mentioned ...
for swf, it depends HIGHLY on the swf ... if the swfs visual appearence is determined by code, there is no other way than to embed a flash player in you app and either let the flash player make the snapshots, encode them as JPEG/PNG, and send them somewhere using TCP or LocalConnection (a flash<->flash communication connection, which can be used with C# as well) or try to somehow grab its output buffer yourself ... the first possibility should be no more than 10-20 lines of actionscript code ... don't know about the latter ...
other than that, you might use an external command line converter ... there are a few floating around the web ...
greetz
back2dos
Take a look at this article, it should point you in the right direction. It uses SharpFFmpeg to extract thumbnail images from movie clips from a variety of formats.
the only way to get an image, is to use a full flash client that starts playing and allows you to capture the first frame.
I would take a close look at flirt (they actually have an example that renders pngs)
Maybe some of the other flash libraries may be of help ( swfdec gnash swift tools gplflash)
Gnash is probably the best choice since its the most mature project out there, but i do not know how easy it is to integrate into command line tools or into your own projects.
We have been working on this in my company, and we got a proof of concept working pretty fast (but the project we made it for is on hold right now). I am not able to share the code, but I can give you some pointers.
It is not pure ASP.NET, but maybe you can still use it. We made a windows service that can be called from ASP.NET.
Basicly you install the flash plugin on the server, the windows services can then simply open the swf through the swf ActiveX component and then you can grap a picture of the whole thing. It works pretty well, notice that you do not have to actually render the ActiveX component on screen to capture the picture.
Check out this post. It does not tell you everything but I guess it provides the ground work required for it. You probably have to figure out how to get the object tag out of the flash-html you are trying to download from a web page. After that you'd have to figure out when to capture the frames. Its a long ride however. You don't need the asp.net part. Just concentrate on the windows project part. Hope this helps. :)
I have a problem I am trying to solve in an elegant manner. I have a .net application that I have created. I am trying to get one of the forms to be shown from a webpage. This sounds strange I'll admit, so here is the backstory
We have some large monitors at work, that show information on them. I have no control over how the information is displayed. Currently they are just using a browser and tabbing in the browser to show each different piece of information on the screen. Most of the info they show is just standard html stuff, text and images.
Now along comes my winforms application. The part of the application I need to show is a graphical display. Everything on this display is drawn using GDI+, if that matters. I need to get this form into a format that I can show. Below is my own solution, but I am pretty sure this is not the best method, but it may be the only method I can use
Create a console application. The application would do the following
1. Run as a service on a server
2. Create the display in memory, and save it to a bitmap every so ofter
3. Save the bitmap to a location on the network.
4. have an HTML file that links the image that can be shown in the browser
I though about doing something with the clients, however the clients are not always up, so I could have periods where the image wouldnt be updated.
I also was thinking about an ASP.net solution, but that would require me to learn ASP.net, and I am not quite ready to take that challenge
In IE you can host a winforms app/control as an ActiveX control, like so:
<object id="DateTimePicker" height="31" width="177"
classid="bin/Web.Controls.DateTime.dll#Web.Controls.DateTime.DateTimePicker" VIEWASTEXT>
</object>
See this article for more information: http://www.codeproject.com/KB/miscctrl/htmlwincontrol.aspx
Now, I'm not claiming that this is any more elegant than your solution, but it is an alternative.
I think using Asp.Net to serve a dynamic image using a HttpHandler would be the best approach, but depending on your skills and time this may not be an option. Here is a nice tutorial: http://www.codeguru.com/columns/dotnet/article.php/c11013
IMHO The best way to build this would be as a browser plug-in, like how Flash works. Microsoft has created a plug-in framework called SpicIE, that allows you develop managed plug-ins for IE. This is probably your best bet.
The old unmanaged way is to build out your WinForms dll app and then package it in a signed cab file, and then reference that cab file with an HTML object tag (codebase arg is the one you need).
i.e.,
document.write("<object CLASSID='clsid:DC187740-46A9-11D5-A815-00B0D0428C0C' CODEBASE='/MyFormsApp/MyFormsApp.cab#Version=1,00,0000' />");
The first time the user hits the page they will be asked to allow for the installer to load its payload (dll's). Once they do, they will have a fully fledged WinForms desktop APP running through a browser window.
I took the easy route on this one. I created a small winform app, that coverts the GDI objects to a bitmap, and then I save the bitmap to a network share. This file is refenced in a simple HTML file that is displayed on the monitor.
I chose the winform app, because it makes it really easy for me to set this up in task manager, and run it every 10 minutes to update.
Has anyone created a 'realtime' csssprite generator for .NET ?
I want one or more directories of images that get loaded at runtime and the css is automatically generated.
Yes, there is. You'll find it at
http://www.codeproject.com/KB/aspnet/cssspritegenerator.aspx
Unlike Microsoft's attempt at sprites, with this package you don't have to change the way your images are stored and how they are shown. You simply add the .dll and configure the package in your web.config with a few lines.
This package also lets you resize images on the fly, compress them and other good things.
Is this what you are looking for?
It's the closest I found to a baked solution.
Ok finally something official...
Not clear yet if it'll make it into the core ASP.NET framework but here's a Microsoft codeplex project for csssprites :
http://aspnet.codeplex.com/releases/view/50869
if you like it - use it - or just like the idea then add a comment. I think this would be a great thing to have in the ASP.NET framework. Have not personally used it (I had to invent the wheel myself) but its got good reviews.
It includes the following components:
API for automatically generating sprites and inline images
Controls and helpers which provide a convenient way of calling into the API
Features Added in Second Release:
A CSS linking control for Web Forms (selects the proper CSS file for the user's browser, but does not display an image)
Using custom folder paths other than App_Sprites
Changing the tiling direction of sprite images
Merging the generated CSS with a user's own CSS
Features under consideration for future releases:
Automatically selecting the most efficient sprite background colour
Automatically minifying the rendered CSS
Compiling against .NET 3.5