Custom URL Protocol - linker error

[gabriemarcelo]

Hi guys, I'm pulling my hair with an error in a desktop app in osx. Using FPC 3.0.4, lazarus 2.0.4
I'm trying to allow my app to respond to a custom URL protocol and used this code from https://raw.githubusercontent.com/transmission-remote-gui/transgui/master/urllistenerosx.pas

Code: Pascal  [Select][+][-]

1. unit URLListenerOSX;
2. {$mode objfpc}{$H+}
3. {$modeswitch objectivec2}
4.  
5. interface
6.  
7. uses
8.   Classes, SysUtils, CocoaAll, InternetConfig, AppleEvents;
9.  
10. type
11.   THandlerProc = procedure(const url: string);
12.  
13.   { TAppURLHandler }
14.  
15.   TAppURLHandler = objcclass(NSObject)
16.   public
17.     procedure  getUrlwithReplyEvent(event: NSAppleEventDescriptor; eventReply: NSAppleEventDescriptor); message 'getUrl:withReplyEvent:';
18.   public
19.     callBack: THandlerProc;
20.   end;
21.  
22. procedure RegisterURLHandler(HandlerProc: THandlerProc);
23. var
24.   handler : TAppURLHandler;
25.   eventManager: NSAppleEventManager;
26.  
27. implementation
28.  
29. { TAppURLHandler }
30.  
31. procedure TAppURLHandler.getUrlwithReplyEvent(event: NSAppleEventDescriptor; eventReply: NSAppleEventDescriptor);
32. var
33.   url : NSString;
34. begin
35.   url:=event.paramDescriptorForKeyword(keyDirectObject).stringValue;
36.   callBack(url.UTF8String);
37. end;
38.  
39. procedure RegisterURLHandler(HandlerProc: THandlerProc);
40. begin
41.   handler:=TAppURLHandler.alloc.init;
42.   handler.callBack:=HandlerProc;
43.   eventManager:=NSAppleEventManager.sharedAppleEventManager;
44.   eventManager.setEventHandler_andSelector_forEventClass_andEventID(handler,ObjCSelector(handler.getUrlwithReplyEvent), kInternetEventClass,kAEGetURL);
45. end;
46.  
47. end.
48.  

In the FormCreate event of the main form, I call the code above with the line

Code: Pascal  [Select][+][-]

1. RegisterURLHandler(@HandleMyCustomURLProtocol);
2.  

and this is the only line

The project fails to compile with the error

Error: linker: Undefined symbols for architecture i386:
Error: linker:  "_res_9_ninit", referenced from:
An error occurred while linking
myapp.lpr(24,1) Error: Error while linking

If I remove the line in FormCreate the project compilation succeeds

Anyone knows why it's not working? Where can I find more details about the error? Thanks in advance!!!

[trev]

Are you compiling a 32-bit app? If so, try 64 bit.

[Thaddy]

What is your OSX version?
And indeed: are you trying 32 bit code with the latest OSX?
Because 32 bit support is dropped. You need to compile for 64 bit.
Are you doing that? Again, what OSX version...

[gabriemarcelo]

Thanks guys for your attention but the error was related to another third-party library. Issue was solved by adding this arguments

Code: Pascal  [Select][+][-]

1. fpc -CF64 -k-framework -k"CoreServices" -k-framework -k"Security" -k-macosx_version_min -k10.7 -k/usr/lib/libresolv.dylib -Tdarwin -Sd
2.