Using Conditions With Features - Symantec WINDOWS INSTALLER EDITOR 8.0 Reference

Using Conditions With Features

Windows Installer Editor Reference
placed by the end user. To do this, you can call Windows Installer functions, such as
MsiGetComponentPath.
Note
Only the files that are in the directory you select or in its child directories will be
installed in the new directory that the end user selects. Example: Suppose FeatureA
installs File1 in the Sample\FeatureA\ directory and File2 in the Windows directory.
During installation, the end user specifies Sample\A\ for the new directory. Only
File1, which was originally in the FeatureA\ directory, is actually installed in the A\
directory. File2 is still installed in the Windows directory.
Required Feature
Mark this if the feature is required for installation. During installation, end users
cannot deactivate installation of a required feature. If you select Never install this
feature in Level (above), it overrides this option.
Disable advertising if not supported by OS
Mark this to ignore any choices you made in the Advertising drop-down list if the
operating system on the destination computer does not support advertising. See
Platform Support of Advertisement in the Windows Installer SDK Help.
See also:
Configuring a Feature Using Its Drop-Down List
You can add conditions to features to specify different actions based on installation
properties, system configuration, end user choices, and so on. Both conditions and
features are listed in the Current Feature drop-down list, which appears on all
Installation Expert pages in the Feature Details page group. Just as you can specify
options on a per-feature basis, you can also specify options on a per-condition basis.
Options on these pages that you associate with a condition are installed only if the
condition is true and the feature is installed.
Example:
Suppose your core application files are stored in a feature named Application. If your
application is installed on Windows 95/98/Me, you want to also install Application9x.dll,
but if your application is installed on operating system later than Windows Me, you want
to install ApplicationNT.dll. You do not want to install both .DLLs, but instead want to
install one or the other based on the version of the operating system. To do this, you:
Add two conditions under the Web_Creator feature, Version9X (which specifies an
OS of Windows 95/98/Me) and VersionNT (which specifies an OS later than Windows
Me).
On the Files page, select the VersionNT condition from the Current Feature drop-
down list, then add the ApplicationNT.dll file.
On the Files page, select the Version9X condition from the Current Feature drop-
down list, then add the Application9x.dll file.
During installation, the files contained within the conditions are installed only if the
condition is true.
Version9X and VersionNT are properties that are set by Windows Installer. See
VersionNT Property and Version9X Property in the Windows Installer SDK Help.
Defining an Installation Project
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