I set a form(not the main form) as auto-created in the project. It seems that I do not need to free it manually when the main form is destroyed. If I do so, then I will get "Invalid Pointer" error. I do not see any document mention that.
Do I need to free auto-created form in Delphi?
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All auto-created Form objects are owned by the
TApplicationobject. It will free them for you when itself is freed. But if you want to free them yourself beforehand, it is safe to do so, provided you don't try to access them after you free them (which, it sounds like you are). When freed, they will remove themselves from theTApplicationobject so it does not try to free them again.