Remote differential compression api support windows 10

About Remote Differential Compression

Remote Differential Compression (RDC) allows data to be synchronized with a remote source using compression techniques to minimize the amount of data sent across the network.

RDC is different from patching-oriented differencing mechanisms, such as Binary Delta Compression (BDC), that are designed to operate only on known versions of a single file. BDC requires the server to have copies of all versions of the file, and differences between each pair of versions are precomputed so that they can be distributed efficiently from a server to multiple clients.

RDC makes no assumptions about file similarity or versioning. Because differences between files are computed on the fly, RDC is ideally suited for synchronizing files that are different or have been updated independently.

RDC does not assume that the file data to be synchronized resides in physical files. Therefore, the RDC application is responsible for performing file I/O on behalf of the RDC library.

Because it is transport independent, RDC can be used with RPC, HTTP, or other desired transport mechanisms. The RDC application bears the responsibility for choosing the appropriate transport and performing any client or server authentication that is required to support the transport’s security model.

RDC is suitable for applications that move data across a wide area network (WAN) where the data transmission costs outweigh the CPU cost of signature computation. RDC can also be used on faster networks if the amount of data to be transferred is relatively large and the changes to the data are typically small.

Remote Differential Compression Algorithm Overview

RDC divides a file’s data into chunks by computing the local maxima of a fingerprinting function that is computed at every byte position in the file. A fingerprinting function is a hash function that can be computed incrementally. For example, if you compute the function F over a range of bytes from the file, Bi. Bj, it should then be possible to compute F(Bi+1. Bj+1) incrementally by adding the byte Bj+1 and subtracting the byte Bi. The range of bytes from the file, Bi. Bj, is called the hash window. The length of this window, in bytes, is called the hash window size.

The RDC library’s FilterMax signature generator «slides» the hash window across the entire file by adding the byte at the leading edge and subtracting the byte at the trailing edge of the window. Meanwhile, the generator continually examines the sequence of fingerprint function values over a given range of bytes, called the horizon size. If a fingerprint function value is a local maximum within the range, its byte position is chosen as a «cut point,» or chunk boundary.

After the file has been divided into chunks, the signature generator computes a strong hash value (an MD4 hash), called a signature, for each chunk. The signatures can be used to compare the contents of two arbitrarily different versions of a file.

Because the size of the signature file grows linearly with the size of the original file, comparing very large files can be expensive. This cost is reduced dramatically by applying the RDC algorithm recursively to the signature files. For example, if the original file size is 9 GB, the signature file size would typically be about 81 MB. If the RDC algorithm is applied to the signature file, the resulting second-level signature file size would be about 5.7 MB.

Remote Differential Compression Application Concepts

When developing an application that uses RDC, it is important to understand the following concepts and terminology.

In a typical RDC scenario, a server and a client have different versions of a file. (The terms client and server refer only to the computers’ roles in this scenario, not their operating systems.) The client’s copy of the file is called the seed file. The server’s copy is called the source file. The objective of the RDC application is to download the file updates to the client, which uses them to construct a target file that combines the updates from the source file with the unchanged contents from the seed file.

The RDC client and server each use the RDC library’s FilterMax signature generator to divide their copy of the file into chunks and compute a strong hash, called a signature, for each chunk of file data. Thus, the client has a list of signatures for the seed file, and the server has a list of signatures for the source file. These signature lists can be computed on the fly, or they can be precomputed.

The client initiates the RDC protocol by requesting the source signature list from the server. Then the client compares each source signature against the signatures in its own seed signature list. If a source signature matches a seed signature, the client already has the file data for that signature. If a source signature does not appear in the client’s list of seed signatures, the client must request the specified chunk (of file data) from the server.

The result of comparing the two signature lists is a needs list, which describes which chunks of file data, from where (seed or source file), are needed to construct the target file on the client computer. Each entry in the needs list is called a needs block.

The client iterates through each needs block and copies the specified chunk of the source or seed file data to the target file. Seed file data is copied locally. Source file data is downloaded from the server. The more similar the seed and source files are, the less network bandwidth is required to create the target file.

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11 Unnecessary Features You Can Disable In Windows 10

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Microsoft’s Windows has a lot of useful features that you may use daily in many tasks. However, there are some unnecessary features that you never use nowadays, such as Internet Explorer 11, PowerShell 2.0, Internet Information Services or even Windows Media Player.

I marked these features as unnecessary because I have never used them, and some of these functions are outdated, such as Internet Explorer 11.

Currently, I’m using Windows 10, and I would recommend disabling most of these features in case that you don’t use them.

Unnecessary Features You Can Turn Off In Windows 10

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Look at the left sidebar and choose “ Turn Windows feature on or off “. The “Windows Features” window will be shown up shortly on your screen.

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To disable any features, simply unselect the checkbox, choose “ Yes ” to confirm your selection again and then reboot your PC to take effect. You can disable multiple features and then restart the computer.

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When you want to activate these features again, go here and tick the checkbox and then reboot the PC.

Now it’s time to show you a list of 11 Windows features that you should disable.

1. Internet Explorer 11

As you know, Microsoft has replaced Internet Explorer with the Edge since they released Windows 10. But the Internet Explorer 11 (IE11) still kept in the operating system – there is no plan to remove it.

However, Microsoft has stopped send updates to IE11 through Windows Update. If you want to update IE11 to fix bugs or for improvements, you have to download it manually from Microsoft Update Catalog.

So if you don’t have any reasons to use IE11 when the Edge is the best choice, then just disable it.

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2. Legacy Components – DirectPlay

DirectPlay is an API of Microsoft DirectX API, which was used for games in Windows Live ten years ago. Nowadays, the modern games don’t use it anymore.

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3. Media Features – Windows Media Player

In fact, Windows Media Player is a popular media player that many users use it. However, the disadvantage of this media player is that doesn’t support some important audio and video types.

In Windows 10, Groove Music is the default media player, which could be replaced for Windows Media Player. Also, if you are using a third-party media player such as VLC Media Player, there is no reason to keep Windows Media Player on your computer.

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4. Microsoft Print to PDF

This is an option that allows you to convert any documents into a PDF file. It acts like a virtual printer that helps to create PDF documents from your real documents in Windows. But if you are using Microsoft Office, then you don’t need this feature because you can save your document to PDF directly within the Microsoft Office.

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5. Internet Printing Client

Like its name, this feature will allow you to print documents through the local network (LAN) or over the Internet with IPP protocol. But if you only use the printer that connected to your computer, this feature is useless.

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6. Windows Fax and Scan

Enabling this feature on your Windows computer will allow you to use Fax or Scan devices that connected to your PC. If you don’t use any of these devices, just turn off this feature.

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7. Remote Differential Compression API Support

Microsoft has introduced this feature for Windows Server 2003 R2 until now, which helps users to manage servers better. Some programs use this feature to remote access and management, such as Remote Desktop Connection. Hence if you don’t use Windows Server or any kinds of remote access, just disable it.

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8. Windows PowerShell 2.0

You may be thought Windows PowerShell 2.0 is the latest version of PowerShell in Windows. However, the most recent version of PowerShell is 5.0 and therefore, it’s useless. You should disable it as soon as possible.

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9. Windows Process Activation Service

If you don’t have any plans to run a home-based server, then you should turn off Windows Process Activation Service. It’s also known as Internet Information Services (IIS), which helped developers to write apps and building their projects. If you are a regular Windows user, just turn it off.

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10. Work Folders Client

This feature in Windows allows you to access and work on any linked devices, such as other computers through the network. But if you are using your Windows PC alone at your home, there is no reason to keep this feature.

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11. XPS Services and XPS Viewer

XPS is a type of file that was designed by Microsoft, to replace Adobe’s PDF. XPS Services and XPS Viewer are features that allow users to create, print and preview XPS documents in your computer. If you don’t have any plans to use, disable them is a good idea.

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If you have any questions about these Windows features, feel free to leave your comment below. Otherwise, post your question in PCGuide forum, experts there will help you out.

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RDPSession class

RDPSession has these types of members:

Events

The RDPSession class has these events.

EventDescription
OnApplicationCloseCalled when an application closes.
OnApplicationOpenCalled when a new application is created.
OnApplicationUpdateCalled when the shared property on the application object is changed.
OnAttendeeConnectedCalled when an attendee connects to the session.
OnAttendeeDisconnectedCalled when an attendee disconnects from the session.
OnAttendeeUpdateCalled when one of the property values for an attendee changes.
OnChannelDataReceivedCalled when data is received from an attendee.
OnChannelDataSentCalled when data is sent to the client.
OnConnectionAuthenticatedCalled when the connection is authenticated.
OnConnectionEstablishedCalled when a connection to the server is established.
OnConnectionFailedCalled when the client fails to connect to the server.
OnConnectionTerminatedCalled when the client’s connection to the server is closed.
OnControlLevelChangeRequestCalled when a viewer requests control.
OnControlLevelChangeResponseCalled in response to a viewer requesting control.
Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows 8, Windows Server 2008 R2, Windows 7, Windows Server 2008 and Windows Vista: This event is not supported before Windows 10 and Windows Server 2016.
OnErrorCalled when a critical error occurs in the session.
OnFocusReleasedCalled when the shared top-level window has gained or lost focus.
OnGraphicsStreamPausedCalled when the graphics stream has been paused.
OnGraphicsStreamResumedCalled when the graphics stream has been resumed.
OnSharedDesktopSettingsChangedCalled when a shared desktop setting changes.
OnSharedRectChangedCalled when the size of the shared top-level window of the application changes.
OnViewingSizeChangedCalled when the viewer cropping size has changed.
OnWindowCloseCalled when a sharable top-level window is closed.
OnWindowOpenCalled when a sharable top-level window is created by an application.
OnWindowUpdateCalled when one of the properties on the Window object changes.

Methods

The RDPSession class has these methods.

MethodDescription
ClosePuts the session in an inactive state, closes all attendees, and stops listening to new incoming connections.
ConnectToClientConnects the viewer from the sharer in reverse connect mode if the viewer cannot connect to the sharer because of a network issue. For example, the viewer may not be able to connect to the sharer because of network address translation (NAT).
ConnectUsingTransportStreamConnects using the specified transport stream.
Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows 8, Windows Server 2008 R2, Windows 7, Windows Server 2008 and Windows Vista: This method is not supported before Windows 10 and Windows Server 2016.
GetDesktopSharedRectRetrieves the rectangle of the sharer’s virtual desktop.
OpenPuts the session in an active state and starts listening to incoming connections.
PausePauses the encoding of the sharer’s desktop to pause sending graphics updates to all viewers.
ResumeResumes the encoding of the sharer’s desktop to resume sending graphics updates to all viewers.
SendControlLevelChangeResponseSends an OnControlLevelChangeResponse event.
Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows 8, Windows Server 2008 R2, Windows 7, Windows Server 2008 and Windows Vista: This method is not supported before Windows 10 and Windows Server 2016.
SetDesktopSharedRectSets the rectangle of the sharer’s virtual desktop to be shared.

Properties

The RDPSession class has these properties.

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Remote differential compression api support windows 10

Обычно все проблемы, связанные с Wi-Fi на Windows 8, имеют очевидные причины и их довольно легко исправить. Ниже будут даны рекомендации по устранению различных проблем, связанных с WiFi (перевод статьи [1]).

[Переустановка сетевого адаптера Wi-Fi]

Часто проблема заключается в некорректно установленном сетевом адаптере. Для этого нужно переустановить адаптер в системе. Имейте в виду, что скорее всего это приведет к отключению от сети Интернет, поэтому лучше скопировать содержимое этой страницы и сохранить на диск, или распечатать. Процесс по шагам:

1. Кликните на кнопку Start в панели задач (Taskbar). Должен появиться экран запуска (плашки). (прим. переводчика: можно просто нажать на системную кнопку Windows, эта такая кнопка с четырехячеечным флажком.)

2. Переместите курсор мыши в правый верхний угол экрана, чтобы справа появилась сервисная панель, и кликните на иконку поиска (лупа). (прим. переводчика: можно просто нажать F3.)

3. В строке поиска наберите Control Panel (Панель управления) и нажмите Enter.

4. Кликните на иконке Apps (приложения).

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5. В результатах поиска выберите Control Panel (Панель управления).

6. В Панели управления в разделе «Network and Internet» (Сети и Интернет) кликните на View Network Status and Tasks.

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7. В левой части окна кликните на Change Adapter Settings (изменить установки адаптера).

8. Сделайте правый клик на сетевом адаптере, выберите Disconnect.

9. Сделайте еще один правый клик, и выберите Delete.

10. Перезагрузите компьютер.

11. Повторите шаги 1..3, чтобы перейти снова в панель поиска.

12. В строке поиска набелите Device Manager (менеджер устройств).

13. Кликните на иконку Settings (настройки).

14. В окне Device Manager сделайте правый клик на имени компьютера в верхней части списка устройств. Выберите Scan for hardware changes (сканирование для определения новых устройств).

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15. Компьютер должен сам распознать Ваш сетевой адаптер, следуйте за инструкциями, появляющимися на экране.

[Обновление драйверов Wi-Fi]

Драйверы, которые в настоящий момент установлены в Вашей системе, могут быть устаревшими. Чтобы улучшить работу Wi-Fi соединения, важно иметь обновленные драйверы. Выполните следующие шаги:

1. Посетите сайт провайдера службы Интернета через Wi-Fi (или сайт производителя Вашего компьютера, ноутбука, или адаптера Wi-Fi).

2. Найдите раздел Загрузки (Downloads), перейдите в нем в секцию Drivers, выберите Вашу операционную систему и её версию (может быть, к примеру, 32-битная или 64-битная версии), и загрузите пакет драйверов на рабочий стол (например, это может быть файл наподобие SP54360.exe).

Прим. переводчика: это также может быть ZIP-архив, тогда предварительно распакуйте его содержимое в любую временную папку.

3. Откройте Device Manager (менеджер устройств), как было показано в предыдущей секции «Переустановка сетевого адаптера Wi-Fi».

4. Раскройте узел Network Adapters (Сетевые платы).

5. Сделайте правый клик на Вашем сетевом адаптере и выберите Update Driver Software (обновить драйвер).

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7. Следуйте инструкциям при установке. По завершению процесса нажмите кнопку Close.

[Оптимизация настроек Wi-Fi (изменение Wi-Fi Internet Settings)]

Прим. переводчика: если Вы подключаетесь к Интернет по Wi-Fi через домашнюю точку доступа, то выберите у неё поддержку стандарта 802.11n. Это самый современный стандарт, который позволяет добиться физической скорости подключения 150 мегабит. Конечно же, сетевой адаптер компьютера также должен поддерживать этот стандарт (если ноутбук или сетевая карта современные, то скорее всего 802.11n поддерживается).

Чтобы Ваш Wi-Fi Интернет на Windows 8 работал быстрее, важно оптимально установить настройки сети и её конфигурацию. Эту задачу лучше выполнить с помощью специального программного обеспечения, которое оценит состояние Вашей сети и соответственно настроит её конфигурацию. Выполните следующие шаги:

1. Загрузите и установите программу RegInOut Internet Optimizer [3].

2. Кликните на кнопку Start в панели задач, появится экран запуска программ. С помощью поиска или визуально найдите RegInOut System Utilities, и кликните на этом значке.

3. В левой части окна кликните на закладку Internet Optimizer.

4. Укажите, что скорость Интернет медленная.

5. Нажмите Analyze и затем кнопку Optimize.

Прим. переводчика: Вы можете посмотреть, на какой физической скорости организовано соединение Wi-Fi, если откроете свойства сетевого соединения. Для этого выберите в Панели управления раздел «Центр управления сетями и общим доступом», в просмотре активных сетей щелкните на ссылку возле подключения, и откроется окно состояния подключения, в нем будет показана скорость соединения.

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[Запретите фичу глобальной автонастройки (Global Auto-Tuning Feature)]

Global Auto-Tuning связана с передачей данных трафика HTTP. Вы можете столкнуться с медленной работой Wi-Fi, если автонастройка по какой-то причине работает неправильно (подробнее про технологию астонастройки см. [2]). Запретите эту фичу с помощью следующих шагов:

1. Запустите окно поиска, как было показано в предыдущих разделах.

2. В строке поиска введите Command Prompt (командная строка).

3. Кликните на иконку Apps (приложения).

4. Сделайте правый клик на Command Prompt в результатах поиска.

5. Выберите иконку Run as Administrator (запуск с правами администратора).

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6. Откроется черное окно консоли. Ведите следующие команды:

7. Посмотрите на результат выполнения команд. Auto-Tuning отключен? Если да, то все хорошо, иначе нужно проверить, правильно ли введены команды, и попробовать их ввести заново.

8. В завершение наберите команду EXIT и нажмите ENTER.

[Удалите поддержку дифференциальной компрессии (Uninstall Remote Differential Compression API Support)]

В Windows встроена технология Remote Differential Compression (RDC). Её работа может также замедлить работу Wi-Fi. Деинсталлируйте RDC следующим образом:

1. Откройте Панель управления, как это было показано в разделе «Переустановка сетевого адаптера Wi-Fi».

2. Кликните на Programs (Программы).

3. Кликните на Turn Windows Features On or Off под секцией Programs and Features.

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4. Снимите галочку, которая называется Remote Differential Compression API Support.

5. Кликните OK, и дождитесь завершения процесса.

Примечание: если Вы хотите снова включить эту функцию, то понадобится исходный инсталляционный DVD Windows 8.

[Очистка DNS]

Аббревиатура DNS обозначает Dynamic Name System (служба поддержки имен серверов в Интернете). Это проверенная временем технология, которая конечно же поддерживается и в Windows 8. Попробуйте очистить кэш DNS, что может оптимизировать скорость Wi-Fi на Windows 8:

1. Откройте консоль командной строки, как это было описано в разделе «Disable Global Auto-Tuning Feature».

2. Введите и выполните следующую команду:

3. После выполнения команды введите EXIT и нажмите ENTER. Обратите внимание, что между «IPCONFIG» и символом «/» должен быть пробел.

[Улучшите антенну Wi-Fi]

Wi-Fi может работать медленнее из-за проблем с антенной на Вашем роутере, или из-за наличия радиопомех. Замените антенну на более мощную, если это возможно.

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