I'm playing around with calling some objective-c code in the Mac system
frameworks, because there are a lot of useful goodies in there. I'm
generally having more success than I deserve. Thanks to some code that I
saw in Tk.jl, I am able to send messages to objects, using various
frameworks, and get the right results most of the time. The problem I've
run into is with messages that take a structure as an argument. For
example, if I try to make a window, I define these types (as defined in the
Foundation framework, IIRC).
immutable NSPoint
x::Cdouble
y::Cdouble
end
immutable NSSize
w::Cdouble
h::Cdouble
end
immutable NSRect
point::NSPoint
sz::NSSize
end
string(r::NSRect) = "{$(r.point.x), $(r.point.y)}, {$(r.sz.w), $(r.sz.h)}"
NSRect(x, y, w, h) = NSRect(NSPoint(x, y), NSSize(w, h))
Then I create the window like so using something like (based on a comment
from stevenj
here<https://groups.google.com/forum/?fromgroups=#!searchin/julia-users/ccall$20struct/julia-users/kBNNGbHhJm8/ZD65gDweOrAJ>
):
window = ccall(:objc_msgSend, Ptr{Void}, (Ptr{Void}, Ptr{Void}, NSRect, Uint64,
Uint64, Int),
oms(ogc("NSWindow"), "alloc"), msg, NSRect(0, 0, 200, 200), 11, 2, true)
# `oms(obj, msg, type)` sends a message to object
# `ogc(class)` gets a pointer to an objective-c class
Unfortunately, querying the window size gives me garbage:
@show oms(window, "frame", NSRect) # expect ((0, 0,), (200, 200))
oms(window,"frame",NSRect) =>
NSRect(NSPoint(1.390671161566996e-309,5.432309224866e-312),NSSize(NaN,NaN))
Changing the origin or the dimensions of the rectangle has no effect on the
output, so I can't even sort out if it's an alignment issue.
So, a fairly open-ended question, does anyone have any tips for getting
this to work? I've been following issue
3466<https://github.com/JuliaLang/julia/pull/3466>,
does that mean that this is hopeless (for the moment)?
