about exit code=216

[7vinbaby]

i want to ask what are the reasons of exit code 216?

[Handoko]

Perhaps this link can be useful:
http://www.freepascal.org/docs-html/user/userap4.html

[Thaddy]

User manual appendix D.
-----------------------------------------
 216 General Protection fault
    The application tried to access invalid memory space. This can be caused by several problems:

        Dereferencing a nil pointer.
        Trying to access memory which is out of bounds (for example, calling move with an invalid length).
----------------------------------------

In other words, there is a huge bug in your code

[Thaddy]

We seem to cross eachother again

[Handoko]

In other words, there is a huge bug in your code

That can happen if you 'play' with the memory, usually using pointer, but you do not manage the memory well.

1. You need to request memory space before you use it
2. You have to free the space if you don't need it anymore
3. If you follow #1 & #2 properly and the you get error 216, it can be you do not dereferencing the pointer correctly.

Read more about dereferencing pointer here:
http://www.freepascal.org/docs-html/ref/refse15.html

[7vinbaby]

Does the lack of initialization be the one reason?

[Handoko]

Maybe. The bug can happen on anywhere in the code. Initialize variables, objects and pointers before you use it always is a good thing to do.

[7vinbaby]

Maybe. The bug can happen on anywhere in the code. Initialize variables, objects and pointers before you use it always is a good thing to do.

all right.Thx

[Thaddy]

Does the lack of initialization be the one reason?

Try to compile with rangechecks on: the error chould change from 216 into 210 if you try to use a virtual method from a class that has not been initialized.
This does not catch use-after-free, though, which can also cause a 216.