6

How to Conversion ? (Objective C Class -> Delphi XE4 )

and How to use Objective-C Class in static Library from Delphi XE ?

Following is the my first trial. But It makes error.

Objective C Source 

// objective C : test.h ----------------------------------------
@interface objc_test : NSObject {
  BOOL busy;
} 
- (int) test :(int) value;
@end

// objective C : test.m ----------------------------------------
@implementation objc_test
- (int) test :(int) value {
    busy   = true;
    return( value + 1);
 }
@end

Here is wrong my conversion code. How to fix that ?

Delphi Source 

// Delphi XE4 / iOS  -------------------------------------------
{$L test.a} // ObjC Static Library 

type
 objc_test = interface (NSObject)
 function  test(value : integer) : integer; cdecl;
end;

Tobjc_test = class(TOCLocal)
  Public
   function  GetObjectiveCClass : PTypeInfo; override;
   function  test(value : integer): integer; cdecl; 
end;

implmentation  

function  Tobjc_test.GetObjectiveCClass : PTypeInfo;
 begin
  Result := TypeInfo(objc_test);
 end;

function  Tobjc_test.test(value : integer): integer;
 begin
  // ????????
  //
 end;

Thanks

Simon,Choi

user1497524
  • 101
  • 1
  • 5
  • You appear to be implementing the function in both obj-c and pascal. Don't you want to implement in obj-c and consume in pascal? – David Heffernan May 13 '13 at 07:04
  • What's more, I'm sure that the compiler does more than "make error". The compiler makes the effort to describe the error. Why can't you make the effort to tell us what it says? – David Heffernan May 13 '13 at 08:05

1 Answers1

6

When you want to import a Objective C class you have to do the following:

type
  //here you define the class with it's non static Methods
  objc_test = interface (NSObject)
    [InterfaceGUID]
    function  test(value : integer) : integer; cdecl;     
  end;

type
  //here you define static class Methods 
  objc_testClass = interface(NSObjectClass)
    [InterfaceGUID]
  end;

type
  //the TOCGenericImport maps objC Classes to Delphi Interfaces when you call Create of TObjc_TestClass
  TObjc_TestClass = class(TOCGenericImport<objc_testClass, objc_Test>) end;

Also you need a dlopen('test.a', RTLD_LAZY) (dlopen is defined in Posix.Dlfcn)

Then you can use the code as following:

procedure Test;
var
   testClass: objc_test;
begin
   testClass := TObjc_TestClass.Create;
   testClass.test(3);

end;
Lars
  • 512
  • 1
  • 3
  • 13