Objective-C Value to C wrapper - Unity Plugin (ios app check)

Question

Hey all, need some quick help with my objective-c plugin. All it does it check to see if Facebook or yelp is installed.

The problem is, I'm not familiar with Objective-C or retrieving the value in the extern C wrapper. see my code below.

I appreciate any help provided. Thanks y'all,

  //
     //  UnityPluginTest-1.mm
     //  
     //  Created by OJ on 7/13/16.
     //
   #import <Foundation/Foundation.h>    
     @interface SampleClass:NSObject
     /* method declaration */
     - (BOOL)isYelpInstalledX;
     - (BOOL)isFBInstalledX;
     @end
     
     @implementation SampleClass
     
         - (BOOL)isYelpInstalledX {
              return [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"yelp://"]];
         }
     
         - (BOOL)isFBInstalledX {
             return [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]];
         }
     
     @end
     
     extern "C"
     {
         bool isFBInstalled(){
                     
           // Need to get the Objective C BOOL value from above, my c# script will read get t$$anonymous$$s value once retrieved
          
        
          //return -(Bool) isFBInstalledX value  //--t$$anonymous$$s doesn't work
          //return ..... // I give up  :(
     
         }
         
         bool isYelpInstalled(){
             
             return false;
       }
     }

Answer 1

Best Answer

Answer by OJ3D · Jul 20, 2016 at 01:52 PM

Finally got the answer!

First - Apparently apple now requires you to place the URL schemes you're planning to call in your info.plist -

"If your app is linked on or after iOS 9.0, you must declare the URL schemes you want to pass to t$$anonymous$$s method. Do t$$anonymous$$s by using the LSApplicationQueriesSchemes array in your Xcode project’s Info.plist file. For each URL scheme you want your app to use with t$$anonymous$$s method, add it as a string in t$$anonymous$$s array." - here's that resource Apple UIApplication-canOpenURL

In t$$anonymous$$s case my strings would be fb, and yelp.

Second, feel free to use my attached scripts:

UnityPluginTest-1.mm (put t$$anonymous$$s in your "Assets>plugins>ios" folder)UnityPluginTest-1.mm
GetMyOjbectiveCUnityPlugin.cs ( t$$anonymous$$s is the bridge. Place t$$anonymous$$s in the same folder)GetMyOjbectiveCUnityPlugin.cs
delete the "txt" portion in the file extension to get them to work

To call the FB/Yelp status from a script of your own you can do:

int testfb = GetMyOjbectiveCUnityPlugin().WegotFBApp(); //0 is No, 1 yes

int testyelp = GetMyOjbectiveCUnityPlugin().WegotYelpApp(); //0 is No, 1 yes

FYI - I have a similar response in another Unity Forum - Objectiv-C to Unity Plugin ios app Status - OJ3D)

Cheers, OJ

unityplugintest-1mm.txt (1.5 kB)

getmyojbectivecunityplugincs.txt (1.3 kB)

Add comment · Show 2 · Share

OJ3D · Jul 20, 2016 at 02:43 PM 0

Share

If you get a value of 20,40 for the status's that still means a "NO". I accidentally left them there from an earlier test. You can spot those "param" values in the "UnityPluginTest-1.mm" file and update them to 0 if you'd like within their respective Objective-C methods.

My forum version has those values updated - ObjC-UnityPlugin-AppStatus

Anyone wanting to do the plist pre-loaded so you don't have to do it manually try these xcode techniques from unity -https://community.unity.com/t5/Unit...Xcode-project-targets-Info-plist/td-p/2235796

Also here's a list of popular URL schemes: http://wiki.akosma.com/IPhone_URL_Schemes

chilemanga · Apr 11, 2018 at 08:08 PM 0

Share

Thank you very much for the detailed responses and sharing. However, there's no need to add "fb" as an URL scheme to open facebook app. If you add that to your Info.plist, the device will open "fb://" links with your app, so be careful.

Answer 2

The following is as far as I got to, unfortunately it's returning as false when fb & yelp are actually both installed on my device:

      //  UnityPluginTest-1.mm
      //  Created by OJ on 7/13/16.
      //In unity, You'd place t$$anonymous$$s file in your "Assets>plugins>ios" folder

    //Objective-C Code
    #import <Foundation/Foundation.h>    
      @interface SampleClass:NSObject
      /* method declaration */
      + (BOOL)isYelpInstalledX;
      + (BOOL)isFBInstalledX;
      @end
      
      @implementation SampleClass
      
          + (BOOL)isYelpInstalledX {
               return [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"yelp://"]];
          }
         + (BOOL)isFBInstalledX {
              return [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]];
          }
      @end
 
     //C-wrapper that Unity communicates with
      extern "C"
      {
          bool isFBInstalled(){                     
            // Need to get the Objective C BOOL value from above, my c# script will read get t$$anonymous$$s value once retrieved        
         return [SimpleClass isFBInstalledX]; //Tested with a build but not returning the true status, also not sure if it's bc it's a BOOL vs a bool
          }
          
          bool isYelpInstalled(){
 
        // Need to get the Objective C BOOL value from above, my c# script will read get t$$anonymous$$s value once retrieved 
        return [SimpleClass isYelpInstalledX ]; //Tested with a build but not returning the true status, also not sure if it's bc it's a BOOL vs a bool
        }
      }

Anyone wondering what the C# script that calls t$$anonymous$$s .mm Obj-c, it looks like t$$anonymous$$s:

  using UnityEngine;
   using System.Runtime.InteropServices;
  
     class GetMyOjbectiveCUnityPlugin : MonoBehaviour {
  
        #if UNITY_IOS || UNITY_XBOX360
  
        // On iOS and Xbox 360 plugins are statically linked into
        // the executable, so we have to use __Internal as the
        // library name.
        [DllImport ("__Internal")]
     private static extern bool isFBInstalled();
        [DllImport ("__Internal")]
     private static extern bool isYelpInstalled();
  
        #else
  
        // Other platforms load plugins dynamically, so pass the name
        // of the plugin's dynamic library.
        [DllImport ("PluginName")]
  
        #endif
  
        void Awake () {
   
        //Assign value we receive to these
        bool FBStatus;
        bool YelpStatus; 
  
           // Calls the isFBInstalled function inside the plugin 
        FBStatus = isFBInstalled(); //returns the status if FB installed on ios device in ObjC plugin
       YelpStatus= isYelpInstalled();//returns the status if Yelp installed on ios device in ObjC plugin
  
        }
     }

Anyway, still stuck with getting not$$anonymous$$ng back. :(

Answer 3

Finally got the answer!

First - Apparently apple requires you to place the URL schemes you're planning to call in your info.plist - "If your app is linked on or after iOS 9.0, you must declare the URL schemes you want to pass to t$$anonymous$$s method. Do t$$anonymous$$s by using the LSApplicationQueriesSchemes array in your Xcode project’s Info.plist file. For each URL scheme you want your app to use with t$$anonymous$$s method, add it as a string in t$$anonymous$$s array." - here's that resource Apple UIApplication-canOpenURL In t$$anonymous$$s case my strings would be fb, and yelp.

Second, feel free to use my attached scripts ( I put them in another Unity Forum - Objectiv-C to Unity Plugin ios app Status - OJ3D)

UnityPluginTest-1.mm (put t$$anonymous$$s in your "Assets>plugins>ios" folder)
GetMyOjbectiveCUnityPlugin.cs ( t$$anonymous$$s is the bridge. Place t$$anonymous$$s in the same folder)

To call the FB/Yelp status from a script of your own you can do: int testfb = GetMyOjbectiveCUnityPlugin().WegotFBApp(); //0 is No, 1 yes int testyelp = GetMyOjbectiveCUnityPlugin().WegotYelpApp(); //0 is No, 1 yes

Cheers, OJ

Objective-C Value to C wrapper - Unity Plugin (ios app check)

3 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions