ofxiOSGetDeviceInfo for querying device type and major / minor versions.

[ofTheo]

As discussed in #2872

This is a more future proof approach for determining version of iOS devices ( vs the older approach of listing every single possible device i.e.: OFXIOS_DEVICE_IPHONE_3GS OFXIOS_DEVICE_IPHONE_3GS_CHINA etc )

It returns ofxiOSDeviceInfo which contains device type, device string and major and minor versions of the device.
In the future we could add more info to ofxiOSDeviceInfo i.e.: bHasCamera bRetina etc

Here is how it currently works with the an iPhone 5 and the simulator.

ofxiOSDeviceInfo info = ofxiOSGetDeviceInfo();
cout << "device type " << (int)info.deviceType <<endl;
cout << "device string " << info.deviceString <<endl;
cout << "versionMajor " << info.versionMajor <<endl;
cout << "versionMinor " << info.versionMinor <<endl;

device type 0  // ( OFXIOS_DEVICE_IPHONE )
device string iPhone5,2
versionMajor 5
versionMinor 2

device type 0 // ( OFXIOS_DEVICE_IPHONE )
device string iPhone Simulator
versionMajor 0
versionMinor 0

pinging @julapy @admsyn

[bilderbuchi]

comparison operators which smartly compare major,minor versions would be useful, I'd think.

[julapy]

@ofTheo, like it!
it would good if there also was a string to tell you the device model, ie iPhone4, iPhone5s, iPadAid etc.
as @danoli3 pointed out, the major number does not always corrolate with the iPhone model number.
we have the ofxiOSDeviceType already, so many a ofxiOSDeviceModel?
and ofxiOSGetDeviceInfo() would contain the logic for working out the device model...
what do you think?

[kylemcdonald]

just reviewing this during the irc meeting, it looks fine to merge and then add @julapy's suggestion after merging.