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How Do You Use Variables in WiX?

Last updated on October 1, 2022 @ 4:13 am

Variables in WiX are used to parameterize your installation. For example, you can use a variable to represent the name of the install directory. This way, if you need to change the install directory, you only need to update the variable rather than search through the code for every reference to the old directory name.

To use a variable in your code, you first need to declare it. This is done using the <?define> element. The <?define> element takes two attributes: Name and Value. The Name attribute is used to give the variable a name and the Value attribute is used to assign a value to the variable.

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You can also use the Value attribute to reference another variable. For example:

<?define MyVariable="MyValue" ?>
<?define MyOtherVariable="! (wix.MyVariable)" ?>

In this example, we’ve declared two variables: MyVariable, which has a value of “MyValue”, and MyOtherVariable, which has a value of “!(wix.MyVariable)”. The exclamation mark is used as a prefix to indicate that the value of MyOtherVariable should be resolved at compile time. In other words, when WiX sees this code it will replace MyOtherVariable with “MyValue”.

NOTE: You cannot use the ! (wix.) notation to reference built-in WiX variables.

PRO TIP: When working with WiX, be careful when using variables. If not used correctly, they can cause your installer to malfunction. Always test your installer thoroughly after making any changes, and make sure to back up your files before making any changes.

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: How Do You Use Variables in WiX? You use variables in WiX by first declaring them using the element.

The element takes two attributes: Name and Value. The Name attribute is used to give the variable a name and the Value attribute is used to assign a value to the variable.

Madison Geldart

Madison Geldart

Cloud infrastructure engineer and tech mess solver.