c# qr code encoder Part 4: Storage and File Management in Visual C#

Encoder QR Code ISO/IEC18004 in Visual C# Part 4: Storage and File Management

Part 4: Storage and File Management
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Microsoft Windows XP Inside Out, Second Edition
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Maximizing Storage Space with NTFS Compression and Compressed (Zipped) Folders
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Even a huge hard disk eventually fills to capacity. To help you avoid running out of room, Windows XP supports two forms of file compression: NTFS file compression and compressed (zipped) folders. The former, available only on disks formatted with the NTFS file system, is the same compression option offered in Windows 2000. The latter is an implementation of the industry-standard ZIP format (the compression format used by WinZip and other third-party programs). You can use either compression option or both. Here are some essential points to note about NTFS compression and zipped folders:
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NTFS compression achieves only a modest degree of compression but is extremely easy
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to use. After you have compressed a set of files and folders (or an entire NTFS disk), files look and behave exactly as before, in both Windows Explorer and in the dialog boxes of the applications you use. The only outwardly visible difference is that the names of your files are shown in blue. However, if you look at the properties dialog box for a compressed file, you ll see on the General tab that the Size On Disk value is (usually) considerably smaller than the Size value; with uncompressed files, the Size On Disk value is the same or slightly larger (because of the way disk space is allocated).
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Windows Explorer and your applications decompress NTFS-compressed files when
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you open them and recompress them when you save. This on-the-fly compression and decompression occurs so quickly that you shouldn t notice any performance effect.
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Files compressed via NTFS compression remain compressed only as long as they stay
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on NTFS disks. If you move a compressed file to a FAT32 disk or e-mail it, the file on the FAT32 disk or the one attached to your e-mail is expanded to normal size, making it compatible with other machines and other viewers software.
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NTFS compression is incompatible with NTFS encryption. A file can be compressed or
encrypted (or neither), but not both.
You can get more dramatic compression with zipped folders than with NTFS com-
pression. Moreover, a zipped folder stays compressed, no matter where it is. Thus zipped folders are an ideal way to compress large files for e-mailing or uploading to Internet sites.
Because zipped folders use an industry-standard compression format, many of your
Part 4: Storage and File Management
17
associates will be able to work with your zipped folders, even if they don t use Windows.
Windows Explorer compresses and decompresses files in zipped folders on the fly. But
your applications do not. Therefore, you can open a ZIP-compressed file in its parent application by double-clicking it in Windows Explorer, but you can t open it using an application s Open command.
Managing and Finding Files Because of the differences between the two compression methods, zipped folders are best used for the following purposes:
For creating compressed archives of files that you no longer need on a regular basis For e-mailing large attachments or uploading documents to Internet sites For squeezing the maximum amount of free space out of a disk that s getting close
to full NTFS compression, on the other hand, is great for everyday work. You won t get a huge amount of space gain with it, but it s easy to set up and so simple to use that you ll probably forget you re using it.
Implementing NTFS Compression
NTFS compression is implemented by means of a file attribute, much as read-only status is. To compress a file or folder using NTFS compression, follow these steps:
1 Right-click the file or folder (or selection of files or folders) in Windows Explorer and choose Properties from the shortcut menu. 2 On the General tab of the properties dialog box, click Advanced. 3 Select Compress Contents To Save Disk Space and then click OK in both dialog boxes.
If you ve selected a folder, you ll see this dialog box.
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In most cases, you ll want to select the second option. If you apply the compression attribute to the current folder only, files that you subsequently add to the folder will be compressed, but the files that are already there will not be.
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Microsoft Windows XP Inside Out, Second Edition You can compress an entire NTFS drive at once. Doing this might tie up your computer for several hours (during which time performance in other programs will be seriously degraded), but you only need to do it once. If you plan to leave the computer unattended while Windows is compressing files, be sure to close all running programs. Windows can t compress files that are open, and if it comes to one that it can t compress, it will idle until you tell it what to do (you can close the file and tell it to try again, or you can tell it to skip the open file and go on). You don t want to come back in the morning and find that the system has been waiting all night for your decision.
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