macOS C++ version of NSScreen frame

[MACaveli7]

I have heard that you can use NSScreen frame to get the current resolution of the screen, is there an alternative version that doesn't need objective c code?

 

[lloyddean]

Yes - look in CGDirectDisplay.h

 

[Thomas Harte]

Even if there weren't, it would be sufficient to declare:

ScreenFrame.h:

#ifdef __cplusplus
extern "C" {
#endif

CGRect GetMainScreenFrame();

#ifdef __cplusplus
}
#endif

ScreenFrame.m:

CGRect GetMainScreenFrame()
{
    return [[NSScreen mainScreen] frame];
}

Or even just rename your .cpp file to .mm (Objective-C++) and put the [[NSScreen mainScreen] frame] right in there. Apple allow Objective-C, C and C++ to be freely intermingled.

Note that you'll get the frame of the main screen. You can use [[window screen] frame] to get the frame for the screen that a particular NSWindow is on.

 

[kainjow]

^ NScreen should only be used within a proper GUI app. Otherwise you should use CGDisplay.

IMO, NSScreen is a poorly written API and the CGDisplay functions are much clearer. e.g. mainScreen != CGMainDisplayID