# Activation user defined functions Reference

Below is a complete list of the user defined functions available in AutoIt. Click on a user defined function name for a detailed description.

When using them you need to add a #include <GDIPlus.au3>.

User Defined Function | Description
--- | ---
_GDIPlus_RectFCreate | Create a $tagGDIPRECTF structure
_GDIPlus_Shutdown | Clean up resources used by Microsoft Windows GDI+
_GDIPlus_Startup | Initialize Microsoft Windows GDI+