Heap Corruption while using CreateWindowExW

Question

I have some problems with heap corruption. The warning can be observed while using CreateWindowExW function. I know that it is usually a memory error, but how could I search

Answer 1

As pointed out above, heap corruption is often detected after the real corruption has already occurred by some DLL/module loaded within your process. From your post it looks like this issue is windows platform specific so I would suggest you to use WinDBG/Pageheap and find out where actual memory corruption is happening. One very very good article about heap memory corruption analysis can be found from the book "Advanced Windows Debugging, Author: By: Mario Hewardt; Daniel Pravat" Chapter 06

http://advancedwindowsdebugging.com/ch06.pdf

Answer 2

Change

WNDCLASSEX wcex = { sizeof(WNDCLASSEX) };

to

WNDCLASSEX wcex = { 0 };

You're initializing pointer members of WNDCLASSEX to non-null (but nonsensical values, namely sizeof(WNDCLASSEX)).