Code Blocks: can i add the #include "stdafx.h"?

[Cambalinho]

can i add the #include "stdafx.h" on Code Blocks?
using 'afx_msg' i can create functions for use the '::' on global section(correct me if i'm wrong):
afx_msg void OnDestroy();

[Thomas1965]

"stdafx.h" is normally used by Visual Studio when you use pre-compiled headers.
afx_msg is used in MFC applications.
You can create a stdafx.h file in CodeBlocks and define afx_msg, however I am not sure what you actually want to do.
http://stackoverflow.com/questions/35320149/what-does-afx-msg-do-mfc

[Cambalinho]

so maybe i'm thinking wrong on what i can do with it :(
but see these sample:

class testafx
{
    public: afx_msg void test()
    {
        MessageBox(NULL, "hello 1","hi", MB_OK);
    }
};

testafx a;
void a::test()
{
    MessageBox(NULL, "hello 1","hi", MB_OK);
}

now you see how i need to use it. unless i'm wrong on what i can do with 'afx_msg'.
like you see, the 'test' isn't declareted on 'a'. but i get these error:
"'a' is not a class, namespace, or enumeration"

[mbozzi]

Line 10 must be void testafx::test()
The behavior "test" belongs to the class of a type, not to an individual instance of that type.
In other words, the test function belongs to every testafx, not a.

[Cambalinho]

"The behavior "test" belongs to the class of a type, not to an individual instance of that type."
so how can i make to an individual instance of that type without redefinition?