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ExitUserDLL and Old Style MFC Extension DLLs

In SOLIDWORKS 2006 and later, the return value of the exported function ExitUserDLL() is checked to see if an add-in allows or disallows unloading by SOLIDWORKS. The return value is of type BOOL, where:

  • TRUE means the add-in can safely be unloaded by SOLIDWORKS.

  • FALSE means the add-in should not be unloaded by SOLIDWORKS.

Add-ins should typically disallow unloading when there are pending references on automation objects managed by the add-in. Continuing the unload process will typically crash SOLIDWORKS if an attempt to free these objects occurs after the add-in has been unloaded.



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