I have an ASP.NET website that stores large numbers of files such as videos. I want an easy way to allow the user to download all the files in a single package. I was thinking about creating ZIP files dynamically.
All the examples I have seen involve creating the file before it is downloaded but potentially terabytes of information will be downloaded and therefor the user will have a long wait. Apparently ZIP files store all the information regarding what is in the ZIP file at the end of the file.
My idea is to dynamically create the file as its downloaded. This way I could allow the user to click download. The download would start and not require any space on the server to be pre packaged as it would copy things over uncompressed sequentially. The final part of the file would contain the information on the contents of what has been downloaded.
Has anyone had any experience of this? Does anyone know a better way of doing this? At the moment I cant see any pre made utilities for doing this but I believe it will work. If it doesn't exist then i'm thinking that I will have to read the Zip file format specifications and write my own code... something that will take more time than I was intending to spend on this.
https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT
I've got a problem, I have a .srt subtitle file, as external and internal as a subtitle stream, it's easy to load/read the external file but how to read the internal file with .mkv/media?
Extracting the .srt file to a temporary folder is only a temporary solution. (Not implemented yet..)
I want to read the file directly from the subtitle stream, any Ideas how to do that?
I've written my own .srt subtitle filter internally in my media player. Pure C# managed code
To add a little more clarification when you add SoftSubtitles to a media file, then it adds the file to the media as a TextStream and that's what I want to read.
I'm using MediaInfo.dll to read the language of the subtitle streams TextStreams but I can't read the actual subtitles..
To simplify the question even more, what I want is to read the subtitles just like I do with an external .srt file, but reading it from a TextStream is not as easy, because I can see it has a TextStream but can't find it, so can't read the Subtitles.
If Possible do you know any programs that can extract Subtitles in to MemoryStream then return the MemoryStream to my program?? Without removing the TextStream.
Does anyone know how the DirectSubVob or FFDshow load the TextStream from the currently playing media??
Du you know of Library that can extract Subtitles??
I fixed my subtitle problem, with a new custom subfilter, made from reading the source code of SubtitleEdit.
I'm trying to figure out a way to embed an image into a file in c#.
What I'm doing is to create a file with text inside of it (it uses XML) , and I want a quite big image embedded into it which I then can read from the file along with the XML.
But how do I do that?
I can't put an image file along with the file since the file may be used on different computers and I don't want 100's of image files laying around with the files.
Any ideas would be appreciated!
I have a task to programamatically scan a folder for georeferenced images. There might be a lot of images, some quite large, and some not georeferenced. The spatial information can also be either embedded or in a world file.
How can I tell programmatically (C#/WPF/ESRI Runtime) if "C:\someFolder\file.x" is georeferenced?
Thanks
First check the file type to see if it's a format that supports built in georeferencing (GeoTiff, jp2, and MrSid). Other static image files would need some sort of companion file with the georeferencing information. So for each image file you'd want to look for a matching companion file.
If you add some info on what formats the images/world files are in it'll be easier to show you some sample code.
There is a virus that my brother got in his computer and what that virus did was to rename almost all files in his computer. It changed the file extensions as well. so a file that might have been named picture.jpg was renamed to kjfks.doc for example.
so what I have done in order to solve this problem is:
remove all file extensions from files. (I use a recursive method to search for all files in a directory and as I go through the files I remove the extension)
now the files do not have an extension. the files now look like:
I think this file names are stored in a local database created by the virus and if I purchase the anti virus they will be renamed back to their original name.
since my brother created a backup I selected the files that had a creation date latter than when my brother performed the backup. so I have placed that files in a directory.
I am not interested in getting the right extension as long as I can see the content of the file. for example, I will scan each file and if it has text inside I know it will have a .txt extension. maybe it was a .html or .css extension I will not be able to know that I know.
I belive that all pdf files should have something in common. or doc files should also have something in common. How can I figure what the most common types (pdf, doc, docx, png, jpg, etc) files have in common)
Edit:
I know it will probably take less time to go over all this 200 files and test each one instead of creating this program. it is just that I am curios to see if it will be possible to get the file extension.
In unix, you can use file to determine the type of file. There is also a port for windows and you can obviously write a script (batch, powershell, etc.) or C# program to automate this.
First, congratulate your brother on doing a backup. Many people don't, and are absolutely wiped out by these problems.
You're going to have to do a lot of research, I'm afraid, but you're on the right track.
Open each file with a TextReader or a BinaryReader and examine the headers. Most of them are detectable.
For instance: Every PDF starts with "%PDF-" and then its version number. Just look at those first 5 characters. If it's "%PDF-", then put a PDF on the filename and move on.
Similarly: "ÿØÿà..JFIF" for JPEG's, "[InternetShortcut]" for URL shortcuts, "L...........À......Fƒ" for regular shortcuts (the "." is a zero/null, BTW)
ZIPs / Compressed directories start with {0x50}{0x4B]{0x03}{0x04}{0x14}, and you should be aware that Office 2007/2010 documents are really ZIPs with XML files inside of them.
You'll have to do some digging as you find each type, but you should be able to write something to establish most of the file types.
You'll have to write some recursion to work through directories, but you can eliminate any file with no extension.
BTW - A great tool to help pwith this is HxD: http://www.mh-nexus.de/ It's what I used to pull this answer together!
Good luck!
"most common types" each have it's own format and most of them have some magic bytes at the fixed position near beginning of the file. You can detect most of formats quite easily. Even HTML, XML, .CSS and similar text files can be detected by analyzing their beginning. But it will take some time to write an application that will guess the format. For some types (such as ODF format or JAR format, which are built on top of regular ZIPs) you will be also able to detect this format.
But ... Can it be that there exists such application on the market? I guess you can find something if you search, cause the task is not as tricky as it initially seems to be.