Are Windows window classes case-sensitive?

Question

MS文档显然是泥浆（并且类名称字符串没有经常引用），我想知道Win32 窗口类的类名是否实际上区分大小写？

Answer 1

They are not case-sensitive. Window class names are string ATOMS, and according to MSDN ,

• Case is not significant in searches for an atom name in an atom table. Also, the entire string must match in a search operation; no substring matching is performed.
• The string associated with a string atom can be no more than 255 bytes in size. This limitation applies to all atom functions.