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When an MSI-based application is launched (by clicking on an advertised shortcut or file type association), Windows Installer checks the existence of key path items.
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Every component is assigned a unique component code GUID. A resource can be a file, registry key, shortcut, or anything else that may be installed. Self-healing, installon- demand and user profile fix-up operate at the Feature level.Ĭomponents are collections of resources that are always installed or removed as a unit from a user’s system. Windows Installer configuration commands operate only on Features (installing, advertising, Uninstalling).
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For example, an MSI might install French and English versions of a program, each of which is a different product.įeatures are buckets for Components. A product is not the same as a package: a single MSI package might install multiple different products. A product is identified by a unique GUID (the ProductCode property). Components (Collection of files and Registries)Ī single, installed, working program (or set of programs) is a product.Each of these tables contains instructions and set-up information. It is actually a database that contains several tables (80+). It is an installation, in the form of a single file. Application Packaging Interview Questions Once the installation is complete, the rollback script and the saved files are deleted. These files are kept in a hidden,system directory. In addition to the rollback script, the installer saves a copy of every file it deletes during the installation. When the installer processes the installation script, it simultaneously generates a rollback script. Rollback: If an installation is unsuccessful, the installer restores the original state of the computer. These actions query the installation database and generate a script that gives a step-by-step procedure for performing the installation.Įxecution: The installer passes the information to a process with elevated privileges and runs the script. MSI Installation Mechanism (Background Mechanism)?Īcquisition: The Installer first installs the feature and then progresses through the actions specified in the sequence tables of the installation database. It is positioned as an alternative to stand-alone executable installer frameworks such as older versions of InstallShield and Wise Package Studio (later versions of both supports Windows Installer) and NSIS.ġ0. New features include a GUI framework and automatic generation of the uninstallation sequence. Windows Installer contains significant changes from its predecessor, Setup API. The installation information, and often the files themselves, are packaged in installation packages, loosely relational databases structured as OLE COM Structured Storages and commonly known as “MSI files”, from their default file extension.
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It is an engine for the installation, maintenance, and removal of software on modern Microsoft Windows systems. It provides a standard method for developing, customizing, installing and updating applications. Windows Installer (previously known as Microsoft Installer) is a built-in Operating System service for Installing and Managing Applications. Microsoft Systems Management Server (SMS).WIX (It cannot be used for re-packaging).Most common reasons for Re-packaging are as follows Why repackaging is required & what are the problems in Legacy Installation? Release the package to end users (Deployment).Ĥ.Repackage the application (Setup capture).Analyze the vendor package (Tech Review).Review the packaging requirements (User Requirement Review).It is not necessary to do setup capture to call it repackaging, even creating must files or is files can be called application repackaging. Repackaging (Customized Installation) is the process of capturing the changes made by an Installation Program (Package) and it is customized to support company standards and distribution methods. The Main difference between packaging and re-packaging is that the source files does not come in the form of package in packaging where as in re-packaging they come in a form of a package, which might be MSI or legacy package (such as executable, batch files, etc). Usually in it binary files provided by developers are packaged to form a package. Process of creating an installer for an application is called application packaging. Application Packaging Interview Questions for freshers experienced :.
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