C++ (Xcode, MAC) EXPERT NEEDED

There's a line of code missing, I need some help.

USING XCODE ON MAC // IF YOU'RE NOT AN EXPERT IN C++ ON MAC, DON'T APPLY.

I need a code that downloads an image from a given URL.

THAT'S IT. THE REST OF THE CODE IS DONE. Please don't waste my time, if you KNOW how to do this, DM ME (don't wait for me to dm you). I will select a candidate immediately.

Thanks