I have been using C a lot lately, and want to explore programming more than just console applications. However, most GUI libraries are object-oriented, and it is very difficult to program with them in programming languages which are not object-oriented such as C. Even object-oriented GUI libraries such as GTK+ that are designed for C require a lot of boilerplate. Because I am having difficulty with these object-oriented libraries I am wondering what GUI libraries are not object-oriented?
I don't know of any modern GUI toolkit that isn't object oriented. OO is simply a very useful programming technique, even in C.
The only toolkit I can mention that I think is not OO is Athena. I haven't really used it, but did have one short CS lab assignment a long time ago that used Athena.
I suppose you could use xlib directly, if you really want to avoid OO.
来源：https://stackoverflow.com/questions/12013693/what-gui-libraries-are-not-object-oriented