Installation Phases and In- Script Execution Options for. Custom Actions in Windows Installer. This article was originally published in the August 2. Install. Shield Newsletter. More Windows Installer articles. InstallShield 2010, InstallScript, Directory Properties and Windows Environment Variables. Figure 12 Custom Action: setInstallFolder parameters.Walkthrough: Using a Custom Action to Display a Message at Installation.NET Framework 2.0 Other Versions Visual Studio 2010.NET Framework 3.5; Visual Studio.NET 2003. Make sure the InstallerClass property is set to True. Abstract: When creating a custom action in Install. Shield. Professional - Windows Installer Edition you have several in- script execution. Immediate execution. Deferred execution. Rollback execution. Commit execution. Deferred execution in System Context. This article explains what these options mean and how they affect in. It also. helps you to insert the custom action in the correct location in the user. Transaction not started. By default there is none, but you could insert an immediate. Then it goes through the script and actually executes the commands. This. second phase is where the target computer is modified, i. Because of these two phases it may look as if the installer went through the. However. that's not exactly true. In addition to script creation and script execution there are two special. Immediate Execution during Script Creation. While the installer builds the script, only immediate execution custom. All other actions (standard actions like. Install. Files and deferred execution custom actions) are only noted in the.
All properties are stored in the script, and can no longer be changed until. Any conditions on actions are evaluated in this phase. Deferred Execution during Script Execution. When the script is built (i. Install. Finalize is reached) the installer. On NT based systems this phase runs in a separate. All the script execution takes place . They are executed in the order they have been. Because this phase runs in a separate process, deferred execution customs. Rollback Execution. While the installer executes the installation script, it builds a rollback. For any standard action in the installation script, a rollback command. The installer cannot automatically undo changes. Instead it adds any rollback. In addition, backup copies of any files that the installer overwrites are. Rollback actions are added in the order they are encountered in the. If the installation is cancelled by the user or aborted because of an error. This is when the rollback custom. The rollback script is processed from bottom up, i. They are added to. Commit actions are added to the commit script only if their condition was. The commit script is executed at the end of the Install. Finalize action, when. The purpose of commit actions is to remove any backup information that had. A sample for the use of deferred, rollback and commit. Imagine a custom action that would modify an existing file. This should. be a deferred execution custom action, so that this change can be undone if. Therefore the custom action would first make a. The rollback custom action would delete the modified file and replace it. It would also delete the backup file. The commit custom action would delete the backup file, because it is no. If Rollback has been disabled on the target computer, no commit script is. Commit is the counterpart of rollback. If rollback is disabled, your. Deferred Execution in System Context. This is a special sort of deferred custom action that is used to perform. On NT/2. 00. 0 systems Windows Installer runs as a. However to restrict. Windows Installer uses Impersonation. This. custom action type is also called . They should only make changes that. This ensures proper rollback in. The rollback custom action should have the same condition as the. This ensures that both actions are. Custom actions that should run with elevated privileges must be of type. Deferred, rollback and commit custom actions can only be placed between. Install. Initialize and Install. Finalize. Not following this rule will result in. Transaction not started. They will not be executed if rollback. About the Author. Stefan Krueger is working as freelance setup consultant, offering support. Install. Shield Software. Corporation. Besides his contract work, he answers questions in various. Install. Site. org web site, a place where setup. If you have any comments about this article, or want to suggest a topic that. Stefan should discuss in a future article, please write to. To read Stefan's articles from previous. Install. Shield Newsletter, please visit. More Windows Installer articles. Copyright . Impressum,Datenschutzerkl.
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