+ XPUI_CUSTOMFUNCTION_GUIINIT myFunction - Define this to call custom function "myFunction" during the installer's GUI initialization.
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+ XPUI_CUSTOMFUNCTION_GUIEND myFunction - Define this to call custom function "myFunction" during the installer's GUI de-initialization. Use this to unload any plugins you have and delete any temporary files that you dumped on to the user's hard drive.
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+ XPUI_PAGE_CUSTOMFUNCTION_PRE myFunction - Call function "myFunction" during the early initialization of an installer page.
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+ XPUI_PAGE_CUSTOMFUNCTION_SHOW myFunction - Call function "myFunction" right before an installer page shows.
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+ XPUI_PAGE_CUSTOMFUNCTION_LEAVE myFunction - Call function "myFunction" while an installer page is unloading.
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+ NOTE: After defining the XPUI_PAGE_CUSTOMFUNCTION symbols, insert the page of your choice, and that will be the page that calls your custom functions. You will need to define the CUSTOMFUNCTION symbols for every page that you want a custom function for.
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