mfc子对话框如何知道父对话框是否按“取消”按钮？

Question

I made Child dialog in Parent dialog's tab control like this. dialog

Child dialog uses database, so it has to be "db.Close()" when I push Parent dialog's "cancel" button.

In this case, How can Child dialog know if Parent dialog push "cancel" button?

OR...

How can Child dialog know right before destroyed by Parent dialog?

Answer 1

1) You could make a message handler in child's class and send it a message from it's parrent.

2) Other way is to make a public method in child's class who clears the window when DB is closed. From the parent call this method on child's object.

The first is much better and much safer solution.