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• How to store millions of pictures about 2k each in size

  - by LuftMensch

  We're creating an ASP.Net MVC site that will need to store 1 million+ pictures, all around 2k-5k in size. From previous ressearch, it looks like a file server is probably better than a db (feel free to comment otherwise). Is there anything special to consider when storing this many files? Are there any issues with Windows being able to find the photo quickly if there are so many files in one folder? Does a segmented directory structure need to be created, for example dividing them up by filename? It would be nice if the solution would scale to at least 10 million pictures for potential future expansion needs.

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• Check whether a string is a valid filename with Qt

  - by ereOn

  Hi, Is there a way with Qt 4.6 to check if a given QString is a valid filename (or directory name) on the current operating system ? I want to check for the name to be valid, not for the file to exist. Examples: // Some valid names test under_score .dotted-name // Some specific names colon:name // valid under UNIX OSes, but not on Windows what? // valid under UNIX OSes, but still not on Windows How would I achieve this ? Is there some Qt built-in function ? I'd like to avoid creating an empty file, but if there is no other reliable way, I would still like to see how to do it in a "clean" way. Many thanks.

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• Adding custom/new properties to any file regardless of type and extension e.g. setting 'Author' on a

  - by Vaibhav Garg

  I want the ability add properties and tags to a file (specifically ebook files and ebook related properties in Windows 7 but interested to go so for as many OSes as possible) For e.g. Example.txt or Example.doc or Example.epub should all store and carry properties like 'Author', 'Publication date', 'Tags' etc.. the properties should be stored with the file itself. Such that if it is transferred to another system it retains the properties (even if i need to install 'my app' to support this function on the other machine) How do I make this possible using .net (preferred) and what file system concepts should I learn to understand the underlying concepts and limitations to be able to implement this feature? Any application that already does this? Thank you

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• Powerpoint file can be deleted without consequence

  - by John Maloney

  I am working on a license management type application that copies a password protected zip file to the applications root. The user clicks a button "Open Presentation" and the zipped file is extracted into the root folder and then I use the Office interop to open the file in Powerpoint. At this point to my surprise I am able to delete the extracted file that is currently open in the Powerpoint application. I had assumed that trying to delete the file would fail as the file is still open in Powerpoint. Why is it allowing me to delete the file? Is the file somehow copied to a temp folder and then opened in PowerPoint? Can I move forward with the application relying on this ability to delete the file as soon as it is opened in Powerpoint? This would be optimal because it helps insure that the file cannot be copied(I am also using the xml to stop "Save As" and "Save" from appearing int Powerpoint). Thanks for the insight, John

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• Figuring out whether string is valid file path?

  - by RoboShop

  the file path may or may not exist, but I need to know if it's in the right format for it to be a valid file path? Anyone know a quick way to do this?

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• The FAT, Linux, and NTFS file systems

  - by Phenom

  I heard that the NTFS file system is basically a b-tree. What about the other file systems? Also, how is FAT32 different from FAT16?

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• mounting ext4 fs with block size of 65536

  - by seaquest

  I am doing some benchmarking on EXT4 performance on Compact Flash media. I have created an ext4 fs with block size of 65536. however I can not mount it on ubuntu-10.10-netbook-i386. (it is already mounting ext4 fs with 4096 bytes of block sizes) According to my readings on ext4 it should allow such big block sized fs. I want to hear your comments. root@ubuntu:~# mkfs.ext4 -b 65536 /dev/sda3 Warning: blocksize 65536 not usable on most systems. mke2fs 1.41.12 (17-May-2010) mkfs.ext4: 65536-byte blocks too big for system (max 4096) Proceed anyway? (y,n) y Warning: 65536-byte blocks too big for system (max 4096), forced to continue Filesystem label= OS type: Linux Block size=65536 (log=6) Fragment size=65536 (log=6) Stride=0 blocks, Stripe width=0 blocks 19968 inodes, 19830 blocks 991 blocks (5.00%) reserved for the super user First data block=0 1 block group 65528 blocks per group, 65528 fragments per group 19968 inodes per group Writing inode tables: done Creating journal (1024 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 37 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@ubuntu:~# tune2fs -l /dev/sda3 tune2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 4cf3f507-e7b4-463c-be11-5b408097099b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 19968 Block count: 19830 Reserved block count: 991 Free blocks: 18720 Free inodes: 19957 First block: 0 Block size: 65536 Fragment size: 65536 Blocks per group: 65528 Fragments per group: 65528 Inodes per group: 19968 Inode blocks per group: 78 Flex block group size: 16 Filesystem created: Sat Feb 5 14:39:55 2011 Last mount time: n/a Last write time: Sat Feb 5 14:40:02 2011 Mount count: 0 Maximum mount count: 37 Last checked: Sat Feb 5 14:39:55 2011 Check interval: 15552000 (6 months) Next check after: Thu Aug 4 14:39:55 2011 Lifetime writes: 70 MB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: afb5b570-9d47-4786-bad2-4aacb3b73516 Journal backup: inode blocks root@ubuntu:~# mount -t ext4 /dev/sda3 /mnt/ mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

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• Linux - How do i know the block map of the given file and/or the free space map of the partition.

  - by Inso Reiges

  Hello, I am on Linux and need to know either of the two things: 1) If i have a regular file on some file system on a partition under Linux is there a way to know the set of the physical blocks that this file occupies on the drive from user space? Or at least the set of the file system's clusters? 2) Is there a way to get the same information about the whole free space of the given file system? In both cases i understand that if there is any possible way to extract this info it will probably be totally unsafe and racy (anything could happen to these set of blocks between the time i see them and act on them somehow). I also really don't want an implementation that will have to know a lot about every filesystem.

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• Reading from a file not line-by-line

  - by MadH

  Assigning a QTextStream to a QFile and reading it line-by-line is easy and works fine, but I wonder if the performance can be inreased by first storing the file in memory and then processing it line-by-line. Using FileMon from sysinternals, I've encountered that the file is read in chunks of 16KB and since the files I've to process are not that big (~2MB, but many!), loading them into memory would be a nice thing to try. Any ideas how can I do so? QFile is inhereted from QIODevice, which allows me to ReadAll() it into QByteArray, but how to proceed then and divide it into lines?

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• Implementing Qt File Dialog with a Different File System Library (boost)

  - by knight

  Hi, I am writing an application which requires me to use another file system and file engine handlers and not the qt's default ones. Basically what I want to be able to do is to use qt's file dialog but have an underlying file system handler (for example built using boost file system library) of mine handling all the operations with regards to file and directory operations within that dialog. I have already written a custom file engine which handles some of the operations but I am now stuck with Qt's file system model and the file system watcher engine, as I need to have the signals transmitted for this custom file engine. Seems like I have a daunting task ahead. Am I heading in the right direction? Is there any other simpler way that I could implement this? Can anyone give me any idea on how to proceed. I was thinking of looking into proxy models but not sure if that would work. Thanks in advance for any help.

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• How can I use filesystem functions in PHP, using UTF-8 strings?

  - by Acacio Nerull

  I can't use mkdir to create folders with UTF-8 characters. <?php $dir_name = "Depósito"; mkdir($dir_name ); ?> But, when I browse this folder in Windows Explorer, the folder name looks like this: Depósito What should I do?

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• iPhone Mobile Safari File System Access

  - by Jon Smallberries

  Is it possible to write to a file in a native iPhone application and have a Safari browser read from that file after having the browser opened from the native app? Alternatively (and this would be great!), would it be possible to launch a mobile Safari webapp from a native iPhone app, and have that application access the OS 3.0 External Accessory Framework? My assumption is no... Basically, I have a functioning iPhone app that wraps a simple mobile Safari webapp, but I'd like to utilize the external accessory framework once I have launched the Safari webapp from the iPhone app...

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• recursive_directory_iterator exception

  - by Jon

  I'm writing a simple program which moves files on my desktop to new location. I don't understand why it crashes after the file has been moved. for(recursive_directory_iterator it(desktop), end; it != end; ++it) { if(it->path().leaf() == fileToMove) { rename(*it, newPath); } } A point in the right direction would be appropriated. Thanks!

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• Determine cluster size of file system in Python

  - by Philip Fourie

  I would like to calculate the "size on disk" of a file in Python. Therefore I would like to determine the cluster size of the file system where the file is stored. How do I determine the cluster size in Python? Or another built-in method that calculates the "size on disk" will also work. I looked at os.path.getsize but it returns the file size in bytes, not taking the FS's block size into consideration. I am hoping that this can be done in an OS independent way...

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• What is the easiest way to loop through a folder of files in C#?

  - by badpanda

  I am new to C# and am trying to write a program that navigates the local file system using a config file containing relevant filepaths. My question is this: What are the best practices to use when performing file I/O (this will be from the desktop app to a server and back) and file system navigation in C#? I know how to google, and I have found several solutions, but I would like to know which of the various functions is most robust and flexible. As well, if anyone has any tips regarding exception handling for C# file I/O that would also be very helpful. Thanks!!! badPanda

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• How to read from database and write into text file with C#?

  - by user147685

  How to read from database and write into text file? I want to write/copy (not sure what to call) the record inside my database into a text file. One row record in database is equal to one line in the text file. I'm having no problem in database. For creating text file, it mentions FileStream and StreamWriter. Which one should I use?

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• List folders from a server RECURSIVELY

  - by fonix232

  I would like to list folders from a webserver into a treeview, keeping the hierarchy. It should not go under level 2 (so root - level 1 - level 2). Would this be possible somehow? If you're interested, I would like to make a list of the Chromium snapshots from here: http://build.chromium.org/buildbot/snapshots/ into a browse-able treeview (well, I'm making a revision checker, what looks up the revisions, and lets the user select the given build and read it's log from http://build.chromium.org/buildbot/snapshots/ + releasetype + / + releasenumber / changelog.xml

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• How to specify a path to store file in Blackberry JDE?

  - by Kumar

  Dear Friends, Can anyone tell me how to store a file in a blackberry simulator.Actually i m using blackberry jde4.6.I created one simple application in that application i created one edit field and one button if we click the button then the content in the file should store as file i don't how to set a path.If u have any idea how to set path to store data please explain. regards, s.kumaran.

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• GetAccessControl error with NTAccount

  - by Adam Witko

  private bool HasRights(FileSystemRights fileSystemRights_, string fileName_, bool isFile_) { bool hasRights = false; WindowsIdentity WinIdentity = System.Security.Principal.WindowsIdentity.GetCurrent(); WindowsPrincipal WinPrincipal = new WindowsPrincipal(WinIdentity); AuthorizationRuleCollection arc = null; if (isFile_) { FileInfo fi = new FileInfo(@fileName_); arc = fi.GetAccessControl().GetAccessRules(true, true, typeof(NTAccount)); } else { DirectoryInfo di = new DirectoryInfo(@fileName_); arc = di.GetAccessControl().GetAccessRules(true, true, typeof(NTAccount)); } foreach (FileSystemAccessRule rule in arc) { if (WinPrincipal.IsInRole(rule.IdentityReference.Value)) { if (((int)rule.FileSystemRights & (int)fileSystemRights_) > 0) { if (rule.AccessControlType == AccessControlType.Allow) hasRights = true; else if (rule.AccessControlType == AccessControlType.Deny) { hasRights = false; break; } } } } return hasRights; } The above code block is causing me problems. When the WinPrincipal.IsInRole(rule.IdentityReference.Value) is executed the following exception occurs: "The trust relationship between the primary domain and the trusted domain failed.". I'm very new to using identities, principles and such so I don't know what's the problem. I'm assuming it's with the use of NTAccount? Thanks

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• Implementing a virtual file system in .NET

  - by Charlie Somerville

  A while back a found a great-looking framework that allowed .net developers to implement a virtual file system. I thought I had bookmarked it, but it seems I haven't. Does anyone know any frameworks for doing this? EDIT: Here's a hint... It had a catchy, short name and it's own domain. Sorry, that's all I can remember :p

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• Computer generated files - how do they work ?

  - by hory.incpp

  Hello, .... ‹BÿЃÀ‰D$Ç„$  ....... that's what happens when you open (notepad) such a file that I'm talking about How do algorithms decode that information and when does a program use/generate it ? Does some notepad-like application exist that open such files and transform them to readable code/data ? Any more information which will clarify about these files will be very helpful. Thank you for your time, P.S I'm not talking strictly about .exe files

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• [C++] Is it possible to use threads to speed up file reading ?

  - by Mister Mystère

  Hi there, I want to read a file as fast as possible (40k lines) [Edit : the rest is obsolete]. Edit: Andres Jaan Tack suggested a solution based on one thread per file, and I want to be sure I got this (thus this is the fastest way) : One thread per entry file reads it whole and stocks its content in a container associated (- as many containers as there are entry files) One thread calculates the linear combination of every cell read by the input threads, and stocks the results in the exit container (associated to the output file). One thread writes by block (every 4kB of data, so about 10 lines) the content of the output container. Should I deduce that I must not use m-mapped files (because the program's on standby waiting for the data) ? Thanks aforehand. Sincerely, Mister mystère.

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• Has Windows 7 Fixed the 255 Character File Path Limit?

  - by The Matt

  As I understand it, the limitation of 255 characters in a file path is a Windows limitation. What is the reasoning for this? If so, has this been resolved in Windows 7? In our continuous integration practices, we often have deeply nested project structures and it would be extremely useful to be able to go beyond 255 characters. Right now we are somewhat forced to structure our projects in such a way as to not hit this artificial ceiling.

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• Prevent unauthorised write access to a part of filesystem or partition

  - by gaurav

  Hello all I have some very important system files which I want to protect from accidental deletion even by root user. I can create a new partition for that and mount it with readonly access but the problem is that I want my application which handles those system files to have write access to that part and be able to modify them. Is that possible using VFS? As VFS handles access to the files I could have a module inserted in the VFS layer which can see if there is a write access to that part then see the authorization and allow it or otherwise reject it. If not please provide me suggestions regarding how can such a system be implemented what would I need in that case. If there exists a system like this please suggest about them also. I am using linux and want to implement this in C, I think it would be possible in C only. Edit: There are such kind of programs implemented in windows which can restrict access to administrator even, to some important folders, would that be possible in linux?

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• Base64 Encoded Data - DB or Filesystem

  - by Marty

  I have a new program that will be generating a lot of Base64 encoded audio and image data. This data will be served via HTTP in the form of XML and the Base64 data will be inline. These files will most likely break 20MB and higher. Would it be more efficient to serve these files directly from the filesystem or would it be feasible to store the data in a MySQL database? Caching will be set up but overall unnecessary because it is likely that this data will be purged shortly after it is created and served. i know that storing binary data in the DB is frowned upon in most circumstances but since this will all be character data I want to see what the consensus is. As of now, I am leaning toward storing them in the filesystem for efficiency reasons but if it is feasible to store them in a database it would be much easier to manage the data.

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