[Problem] WinApi Keyboard Hook

Hi, i make little program for my friend and it's very important. In my program I use winapi keyboard hook but that hook no detect uppercase and lowercase. Any return from hook are uppercase. Because I live in poland I use polish letters e.g ąćęłó ... But hook never returns the polish letters which me are needed. But it's no all. Hook never returns special chars e.g " ' . , < > ! @ # ect. I write that post because I believe can you give me some help. just I need polish letters, detection of upper case and lowercase and special chars. I only have modified hook code from scite help but i don't know what i must write more in hook code for good working.  For end sorry for my english because my friend google translator is to use on ass.

It's my modified code:
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Please help me i think those forum it very helpful. Regards.