Victimisation C and C++ in an iOS App with Objective-C++

In my late tutorial. I discussed how to break Humanoid apps in C or C++ victimization the Indigene Maturation Kit. Therein tutorial, Ill enclose how to use C or C++ conjointly Objective-C in iOS. Different Humanoid which inevitably a limited API (the NDK) to keep indigene ontogenesis, iOS supports it by nonpayment. C or C++ ontogenesis is more aboveboard with iOS because of a have called Objective-C++. Ill discourse what Objective-C++ is, its limitations and how its ill-used for edifice iOS apps.

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What Is Objective-C++?

Objective-C++ may phone same a new scheduling words, but its not. Its a combining of two languages, Objective-C and C++. Apple provides Objective-C++ as a commodious mechanics for intermixture Objective-C cipher with C++ cypher.

Objective-C is approximately C but with object-oriented features enforced as a cut level on top of C. Its a nonindulgent superset of C which makes any C codification a valid Objective-C broadcast.

Evening though Fleet is now the recommended words for development iOS apps, thither are stillness near reasons to use elderly languages same C, C++ and Objective-C. Disdain the warm ascent of Fleet, Objective-C is lull the rife lyric on iOS because of the slew routine of existent apps and libraries already created with it.

One reasonableness to use Objective-C is to porthole an existent C/C++ platform scripted for another chopine to iOS. Underdeveloped cross-platform apps victimisation C or C++ is potential with around heedful preparation. Disdain Fleet existence clear root, its not yet amply supported early platforms. Another use showcase is the power to leveraging existent aborigine codification libraries that are already useable. This is one of the almost authoritative reasons to lull use C/C++/Objective-C for iOS apps.

Victimization Objective-C++

The last task for this tutorial can be constitute on GitHub.

Produce the Externalize

Unfold Xcode and select Make a new Xcode labor.

In the guide option screenland, take Ace Panorama Lotionfrom the iOS Covering tab and pawl Succeeding.

In the undertaking options cover, gens the merchandise HelloCpp. Introduce your system and constitution identifier in setback area describe fashion.

Because its not truly a speech, theres no choice to make an Objective-C++ labor. Whats usable is either Objective-C or Blue-belly. For this task, prefer Objective-C. Bequeath the early options as they are and chink Adjacentand take a leaflet to economize the externalize.

Sentence to add roughly C++ encrypt. If this is your get-go sentence with C++, cheque this tutorial on the terminology. Consider the Projection Navigatorbattery-acid on the odd. Almost of the files end with either an .hor .m. Those that end with .hare cope files spell those with .mare Objective-C root files.

Produce a C++ family that bequeath be called from an Objective-C register. Make a new register victimisation the Charge -New -Lodgecard particular or pressing s construction should now flavor similar the pursual. Smell unblock to haul files round to ameliorate the system in the Task Navigator.

Unfold Salutation.hppand add the chase cipher betwixt the admit and #endif /* Greeting_hpp */ lines:

Set these methods in Salutation.cppby adding the followers encrypt subsequently the admit Salutation.hpp business:

This is simpleton encrypt that creates a course named Salutation with a individual method named recognize() that returns a thread evaluate.

Objective-C with C++

Now that youve added the mere C++ Salutation form, try career this from Objective-C. Out-of-doors ViewController.mand signification the Salutation.hpphead lodge:

Hold a varying of case Salutation within the ViewControllers @interface stop.

If the Read survive issuesselection is enabled, an mistake expression Stranger eccentric distinguish Salutation volition forthwith seem subsequently adding the late pipeline of encrypt. To fix this exit, rename ViewController.mto ViewController.mm. This dim-witted assignment convening tells Xcode that ViewController wants to mix Objective-C with C++. Astern renaming the register, the fault www.cimshow.co.uk should melt.

Lets shuffling the app more synergistic by adding a push. Blue-ribbon Master.storyboardfrom the Task Navigatorto prove the Aspect Restrainer panorama. Cart a release from the Target Library to the centre of the hold shown beneath. Commute the schoolbook to Tap Me!.

Produce a UIButton vent that points to the lately created clit. Piece hush in the Principal.storyboardsieve, surface the Help Editor by toggling it from the toolbar. Pressing the ascendencekey on the keyboard and cart a connecter from the clitoris to a demarcation beneath the salutation varying. Distinguish this exit helloButton.

Afford ViewController.hand add the next IBAction method betwixt @interface and @end :

Limit this method in ViewController.mmwith the chase cypher inserted afterwards the – (vacancy)didReceiveMemoryWarning use and ahead @end :

This method calls the recognize() method outlined in the C++ grade Salutation and uses the train valuate it returns to supersede the Tap Me!buttons deed. Relate the clit to this activeness victimisation the like mastery + pullproficiency. Recover to the Chief.storyboardscreenland and afford the Help Editor via the toolbar so restraint + carta connecter from the clit to the – (IBAction)showGreeting methods eubstance. The minor holler circuit on the remaining of the – (IBAction)showGreeting method should be excited/filled indicating that the Tap Me!clitoris is now attached thereto fulfill.

Chassis and run the app. Observation that the release appears off-centered on the simulator. Fix this by enabling Automobile Layout constraints victimization the Ascendence + pullproficiency. Associate the release to its container and enable both erect and horizontal focusing. Run the app again to see the improvements.

Limitations

Objective-C++ doesnt really conflate Objective-C with C++ features. Signification, Objective-C classes habit bear features that are useable to C++ and contrariwise. The next inscribe examples instance these limitations:

Vocation a C++ Objective Victimisation Objective-C Syntax Leave Not Study

Constructors or Destructors Cannot Be Added to an Objective-C Objective

The keywords this and ego Cannot Be Exploited Interchangeably

Hi, I billet hither a gossip some the former clause Victimization C and C++ Inscribe in an Humanoid App with the NDK because I cant input complete thither.
This clause is really squeamish and was helpful for me. Nonetheless I suffer about troubles with the purpose SDL_LoadBMP(picture.bmp). I stringently followed the tutorial, but AndroidStudio gaves me the pursuit fault. SDL_LoadBMP: coffee.io.FileNotFoundException: simulacrum.bmp. I well-tried lots of things to debug this mistake but they all failed. May you be more open most how to configure paths or resources or anything else to get me out of this misplay. I dont rattling recognise if persona.bmp is wellspring pie-eyed in the app and if it is the suit, where it is placed. (I work AndroidStudio 1.5.1, on macOS X (El Capitan)).
Thank you ahead !

Ok, I resolved my job Thither is an wrongdoing in your clause. Its scripted To accompaniment this, produce a leaflet named plus in No, the pamphlet bear to be named assets, with an s at the end. Now, it deeds. -)

Did you get the NDK model to oeuvre with API 12 on a Mac. I cannot get the task to synchronise with API 12. I changed it to API 14 so it syncs, but it wont run.

Hi. I would ilk to ask a mates of questions approximately the Humanoid App with NDK card besides. Can you delight enable comments or e-mail me calculate via my LinkedIn invitation.