CODEWITHSUNDEEP
c++block
Walking Corpse
Walking Corpse

Reputation: 93

How to get rid of bogus _BLOCK_TYPE_IS_VALID assertion failure during delete?

When I built my visual C++project in debug mode, just with two lines of code

TEnviron * fk = new TEnviron();
delete fk;

it throws an assertion failure error _BLOCK_TYPE_IS_VALID from _CrtIsValidHeapPointer. The comment for it says 

Verify pointer is not only a valid pointer but also that it is from the 'local' heap.

The TEnviron is from a different dll than my main program so it is failing. I'm in a desperate need to identify a "real" memory corruption in my software so I came to use debug build with the hope it can catch the corruption, but it is just making bogus noise, and would not let me continue beyond that statement. Can't a man write a delete statement? Please help before I get fired.

Upvotes: 1

Views: 194

Answers (1)

Al Kepp
Al Kepp

Reputation: 5980

If we talk about MSVC, I personally create and delete objects of classes imported from a DLL only in that DLL. So they always exist in the DLL's heap, not main heap. I do it using a pair of static functions create/destroy. This way I can safely create and delete objects from anywhere. Maybe this is not the best solution for you, but it solves your problem.

Upvotes: 1

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