what is wrong with this code?

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when i run my program with this code, it says "has encountered an error and needs to close", the last line is causing the error

Code:

wstring windowNameWstr = L"Untitled - Notepad";
        HWND windowHandle = FindWindowW(NULL, windowNameWstr.c_str());
        cout << windowHandle;
        DWORD* procID;
        GetWindowThreadProcessId(windowHandle, procID);

what is wrong?

@_corn_
i dont know
but try replacing HWND windowHandle = FindWindowW(NULL, windowNameWstr.c_str());
with HWND windowHandle = FindWindowA(NULL,"Untitled - Notepad")