Why is an access violation add address error reported when the program is closed?

左手倒影

This error is reported every time the program is closed. What is going on?

apple_058

Give me some code to know

左手倒影

Where does this code go? When I close the program, I call Application-> Terminate () directly, and then I report an error, but I have no problem with following the breakpoint here, and I can exit normally.

Kaysin

This problem is hard to say. It is estimated that you have terminated it before anything is closed, but setting a breakpoint run has given enough time to complete that task.

mad_diablo

After some memory was released, it was accessed again.

cooler42

See what you did when running the program, which caused this error.
For example: If after running the program, the program exits directly and an error occurs, it may be that during some program startup events, there is a problem with some piece of code, the pointer may be out of bounds and the like. Try to block this code or some of it to see if it still makes a mistake, so as to determine where the code is wrong.

左手倒影

I opened a child window, after running some code in the child window, closing the child window, an error occurred when closing the main window, but there was no error when closing the child window.

wsmyth

You'd better release the dynamically allocated memory in your program explicitly, such as: free, dealloc ..., Close, etc., especially the release of some object instances, such as: form

wsmyth

Personally think that you have a problem when closing the child window and the main window. Generally, a form1 calls another form2 (dynamically created) process: Form2 = new TForm2 (this);
          Form2-> ShowModal ();
          Form2-> Close ();
          Form2 = Null;

左手倒影

Thank you Rufeng, I changed the program a little bit.

Now I want to send a message to the main form when the child window is closed, delete the subform pointer and assign NULL

Here is the added message map
    BEGIN_MESSAGE_MAP
        MESSAGE_HANDLER (WM_FORM_CLOSE, TMessage, CMMessage)
    END_MESSAGE_MAP (TForm1)

Custom message, the program runs together hereEND_MESSAGE_MAP (TForm1) Here is the stack overflow, why is this?