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It is hard to know what the problem is without seeing some code. However, one of the common causes for such a behavior is accesing a dangling pointer. This means trying to do something with a pointer you have already deleted (for example, deleting it again or trying to dereference it).<br />
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If you post some code, we may be able to provide better help.<br />

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It is hard to know what the problem is without seeing some code. However, one of the common causes for such a behavior is accesing a dangling pointer. This means trying to do something with a pointer you have already deleted (for example, deleting it again or trying to dereference it).

If you post some code, we may be able to provide better help.


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the problem is in a MFC application:<br />
when closing a dialog by system menu, an unhandled exeption occurs. 
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the problem is in a MFC application:
when closing a dialog by system menu, an unhandled exeption occurs. 

an unhandled exeption when closing a dialog

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.