請問各位前輩，我寫了一個含有Form的dll，當我從Form1呼叫dll Form的時候可以設定它的parent為Form1嗎？如果可以該如何實現呢？謝謝

MDI form or form inside panel? I think you can do it in 2 ways: 1) pass the global variable Application from you main form to the dll and assign it to the same global variable inside dll 2) build with runtime package IMHO, 2) is easier since in 1) the main form and the dll are running 2 different instances of VCL (something make screw up, e.g. is operator). Of course you need to pass the main form instance to the dll and make it its parent in both case.

謝謝william版主，我會試看看的，如果有問題再上來請教