Loading classes at run-time: How?

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2 total messages Started by Frank Hartlep Mon, 14 Sep 1992 13:04

#1016

Author: Frank Hartlep
Date: Mon, 14 Sep 1992 13:04

14 lines
1264 bytes

I do not want to use the objc_{load,unload}Module routines because
of their FIFO behaviour. Just loading the class file with rld isn't
enough, my app still complains 'class MyClass not linked into application'.
I can only guess why it reacts like that: There's a hash table containing
the Class structures of all classes known to the app, and by trying
objc_getClass ("MyClass") I get the same error message. So I suppose I
have to insert MyClass into the table by hand. This can be done with
objc_addClass (). The only problem is that I can't find any way to
obtain the Class structure of MyClass, which I need as an argument for
objc_addClass (). Any ideas from where to get this little beast?


Frank
mauriti@cs.tu-berlin.de

Re: Loading classes at run-time: How?

#1055

Author: Frank Hartlep
Date: Tue, 15 Sep 1992 13:47

19 lines
1656 bytes

In article <TA168WJ@mailgzrz.tu-berlin.de>, mauriti@cs.tu-berlin.de (Frank Hartlep) writes:
> I do not want to use the objc_{load,unload}Module routines because
> of their FIFO behaviour. Just loading the class file with rld isn't
> enough, my app still complains 'class MyClass not linked into application'.
> I can only guess why it reacts like that: There's a hash table containing
> the Class structures of all classes known to the app, and by trying
> objc_getClass ("MyClass") I get the same error message. So I suppose I
> have to insert MyClass into the table by hand. This can be done with
> objc_addClass (). The only problem is that I can't find any way to
> obtain the Class structure of MyClass, which I need as an argument for
> objc_addClass (). Any ideas from where to get this little beast?

Found the solution yesterday:
getsectdatafromheader (MyMachHeader, "__OBJC", "__class", &Size) returns
a pointer to an array of Class structs defining the loaded classes.
If somebody's interested in example code showing how to load/unload
classes in a random order, I'll post it.

Frank

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