I am working on a project that uses Huffman algorithm to compress files, and I am doing my project using Java, what I want is to create my own file extension say (.huff) for the compressed file, and when I right click a file if it has the (.huff) extension, I want to add a new option which decompresses it, I searched the web but I did not find anything useful.
Any help would be appreciated.
To set the file extension just use one of the String methods like append(".yourExtension") (append it to the filename) and set as filename. Simple as that.
String filename = filename.append(extension);
To decompress the compressed file, I suggest you write a metod to which you provide a path to file as argument, check if the file extension is correct and then in another method you decompress this file.
There is nothing special about a file extension, it's just a part of the file name. To create a .huff file extension, just add .huff to the end of the file name.
To add the windows context menu, that's explained in the question linked in the comments How can I add a context menu to the Windows Explorer for a Java application?
I would recommend creating a batch script that will launch your program taking in the file to decompress as an argument.
Something similar to:
#echo off
java -cp <path-to-jar> <decompression main class> %1
Adding in any other setup or program arguments you need. Then a registry entry might look like.
HKEY_CLASSES_ROOT\.huff\shell\Decompress huffman encoded file\command
"<path to batch file>" "%1"
Related
I need to export/import my spk file via windows Batch script.
For which I have been referring this document
But this document does not mention how to save the file (I mean with which extension .bat or .sas)
My command:
ExportPackage -profile "SAS_MW_TEST" -package "F:\mypath\Package4.spk" -objects "/_Applications/_05_MW/_01_SAS_MW/_20_Processes/savedesk(Folder)" -subprop -types "Condition,BusinessRuleFlow,ExternalFile,Cube,SearchFolder,Table,GeneratedTransform,OLAPSchema,InformationMap.OLAP,Measure,Column,Job.CubeBuild,Action,Library,MiningResults,DeployedJob,CalculatedMeasure,Hierarchy,InformationMap.Relational,RootFolder,Prompt,Document,ConditionActionSet,DecisionLogic,Dimension,Note,StoredProcess,PromptGroup,Job,OrchestrationJob,MessageQueue,Service.SoapGenerated,Level,SharedDimension,DeployedFlow"
ExportPackage is an executable program that you can run out of a batch file.
Use Notepad or any other text editor (which includes any SAS code editor), place the ExportPackage program command in the editor and use the File/Save As feature to save the file as something like myPackageExporter.bat
If the items in the package are say stored processes whose metadata says the source code is in an file system folder (aka source code repository), you will probably also want to zip up the folder.
This macro can help you prepare the batch script, ready for export: https://core.sasjs.io/mm__spkexport_8sas.html
I need to store data in a file in this format
word, audio, jpeg
How would I store that all in one file? Is it even possible do would I need to store links to other data files in place of the audio and jpeg. Would I need a custom file format?
1. Your own filetype
As mentioned by #Ken White you would need to be creating your own custom file format for this sort of thing, which would then mean creating your own parser type. This could be achieved in almost any language you wanted but since you are planning on using word format, then maybe C# would be best for you. However, this technique could be quite complicated and take a relatively large amount of time to thoroughly test your file compresser / decompressor, but may be best depending on your needs.
2. Command line utilities
Another way to go about this would be to use a bash script to combine all of the files into one file, and then decompress it at the other end. For example the steps could involve:
Combine files using windows copy / linux cat command on command line
Create a metdata file of your own that says how many files are in this custom file, and how much memory each one takes up (could be a short XML or JSON file for example...)
Use the linux split command or install a Windows command line file splitter program (here's just one example) to split the file back into whatever components have made it up.
This way you only have to create a really small file type, and let the OS utilities handle the combining of them for you.
Example on Windows:
Copy all of the files in your current directory into one output file called 'file.custom'
copy /b * file.custom
Generate custom file format describing metadata (i.e. get the file size on disk in C# example here). This is just maybe what I would do in JSON. SO formatting was being annoying so here's a link (Copy paste it into an editor or online JSON viewer).
Use a decompress windows / linux command line tool to decompress each files to the exact length (and export it back to the exact name) specified in the JSON (metadata) file. (More info on splitting files on this post).
3. ZIP files
You could always store all of the files in a compressed zip file, and then just use a zip compressor, expander as and when you like to retreive any number of file formats stored within.
I found a couple of examples of :
Combining multiple files into one ZIP file in only C# .net,
Unzipping ZIP files in C#
Zipping & Unzipping with only windows built-in utilities
Zipping & Unzipping in Linux command line
Good Zipping/Unzipping library in Java
Zipping/Unzipping in Python
There are many programs which help me write more efficient code (NirCmd etc.), but they can't run properly if they aren't installed in the computer. So is there a way to, for example, in the temp folder, extract the program from a batch program and use it.
I tried reading the executables with a hex editor, putting the hex code into another file and saving it as an executable. But this failed. So, is there any way to efficiently store an executable inside a batch file, create it and then run it?
Yes, there is one that I know of and works perfectly.
It is a program called bhx.exe (link to its site here).
It can also embed other file types.
The usage is quite simple:
(optional) Create a cabinet (.cab) file from the original .exe using this command: makecab yourexe.exe yourexe.cab. For better compression you can use the /D switch in this way: makecab /D CompressionType=LZX yourexe.exe yourexe.cab
CD to the directory bhx is in and do this: bhx yourexe.cab. Other switches are described in the website.
There you go, the mybin.cmd file is generated.
What is the file name extension ".done"?
How to handle the files with this extension? For example filename.log.gz.done is file name, can we just remove the done extension and use it?
What is the use of this file extension?
".done" is just a marker that signifies that the file is ready for consumption.
So yes, get rid of the done extension and use it.
More details can be found here: http://www.davsclaus.com/2010/12/camel-26-using-done-files-with-fileftp.html
The ".done" file extension may be appended onto any type of file, such as a .TXT or .LOG file, and may be found on an FTP server where multiple have access to the file. The DONE file helps prevents a user from accessing a file that is not meant to be accessed. The ".done" extension should be removed in order to open the actual file.
This takes you to the source from which I'm quoting my answer from. You will see a clear explanation of .done file extension and it's also a great reference for any other file extensions that you might need information about
I have bunch of files that need to have a (.) dot removed from the file-name. Eg. "Mr.-John-Smith.jpg" to "Mr-John-Smith.jpg". I don't have real experience with programming and know only html/css and a little javascript. I found another identical question here on stackoverflow, but what I gathered it was fixed on linux system and BASH was used.
Anyways, if anyone could provide me a tutorial on which program to use for this and what code to execute in that program to make it happen I'd be grateful.
if you are using a windows environment (which i guess you do)
you can download this free utility to mass change file names !
main page :
http://www.bulkrenameutility.co.uk/Main_Intro.php
download page :
http://www.bulkrenameutility.co.uk/Download.php
its easy to use
enjoy
If your file names in a file...
1- Open Microsoft Word or any text editor. Press ctrl+h and then search "." without quotes then replace it with blank character.
2- It will remove all dots, again bring "." to your file extention such as .jpg , .png searh your file extention for example "jpg" and replace it with ".jpg"
It will works %100, i am using this method everytime.
if they are not in a file and if you want do somethings in your operation systems' file system
Try this program. It is very useful for this operation;
Download
To remove all except the extension dot from all files in a directory, you can use PowerShell that comes with newer versions of Windows, and can be downloaded for older versions;
Line breaks inserted for readability, this should go on one line;
PS> dir | rename-item -newname {
[System.IO.Path]::GetFileNameWithoutExtension($_.name).Replace(".","") +
[System.IO.Path]::GetExtension($_.name); }
What it does is to take the file name without an extension and remove all dots in it, and then add back the extension. It then renames the file to the resulting name.
This will change for example do.it.now to doit.now, or in your case, Mr.-John-Smith.jpg to Mr-John-Smith.jpg.