Question

I want to add scripting support for an Objective-C project using the objc runtime. Now I face the problem, that I don’t have a clue, how I should call an Objective-C method which takes several named arguments.

So for example the following objective-c call

[object foo:bar];

could be called from C with:

objc_msgSend(object, sel_getUid("foo:"), bar);

But how would I do something similar for the method call:

[object foo:var bar:var2 err:errVar];

??

Best Markus

Answer 1

objc_msgSend(object, sel_getUid("foo:bar:err:"), var, var2, errVar);

If one of the variables is a float, you need to use @Ken‘s method, or cheat by a reinterpret-cast:

objc_msgSend(..., *(int*)&var, ...)

Also, if the selector returns a float, you may need to use objc_msgSend_fpret, and if it returns a struct you must use objc_msgSend_stret. If that is a call to superclass you need to use objc_msgSendSuper2.