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

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)).