Differences between true and true in upper case in C ++

1. Differences in C ++
True is of the bool type;
True is int type, which is defined by MS in VC;

C ++ does not allow two functions to be differentiated by different return types

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You wrote it wrong ...... The original function declaration is
Virtual bool initinstance ();

Your function declaration is bool, so you need to write it as bool.
Bool and bool are different.

 2. What do "DWORD" and "hwnd" mean respectively?
DWORD type indicates "dual", which is an integer value of four bytes. In windef. H, DWORD is defined as follows:
Typedef unsigned long DWORD; that is, DWORD is the same as unsigned long.
In the same windef. h file, hwnd is defined as follows:
Struct hwnd __{ int unused;}; typedef hwnd _ * hwnd;
That is to say, hwnd is a pointer to the hwnd _ type, and the type hwnd _ is obviously something like a placeholder. Simply put, hwnd is a pointer used to define the handle of a window.

3. Is there any difference between "false" and "false" in MFC?
There are differences. False is a bool value of the byte size. False indicates the bool value, and bool indicates the typedef int bool, which is four bytes in size. Although the values of false and false are both 1, one is four bytes and the other is one byte.