objective c - Use of Cocoa in C++ like in Delphi -


there pattern in delphi work cocoa classes. blog pattern here:

using os x apis directly delphi

i wonder, how works , whether can done xcode in c++ too.

as example take function "internalgetmacospath" system.ioutils.pas. put excerpts of involved code @ end of post. line of code interested in is:

  nsfile := tnsfilemanager.wrap(tnsfilemanager.occlass.defaultmanager);

in essence following equivalent in c++:

nsfilemanagerclass* pfmanagerclass; nsfilemanager* pfmanager;   // getocclass void* cls = objc_getclass("nsfilemanager"); pfmanagerclass = import(cls);  // wrap pfmanager = import(pfmanagerclass->defaultmanager());

i know whether dummy function "import" can defined use of objective-c runtime functions. guess delphi has use objective-c runtime functions in end too. else have informations vtables?

code snippets:

nsfilemanager = interface(nsobject)   ['{9736df94-95e9-4111-8c94-82d5eff52a81}']   function urlfordirectory(directory: nssearchpathdirectory; indomain: nssearchpathdomainmask; appropriateforurl: nsurl; create: boolean; error: ppointer): nsurl; cdecl; ...  nsfilemanagerclass = interface(nsobjectclass)   ['{e666adeb-9dbe-4bf0-bee0-5912cf9f5ab4}']   {class} function defaultmanager: pointer; cdecl; end;  tocimport = class(trawvirtualclass, ilocalobject) tocgenericimport<c: iobjectivecclass; t: iobjectivecinstance> = class(tocimport) tnsfilemanager = class(tocgenericimport<nsfilemanagerclass, nsfilemanager>)  end;   class function tocgenericimport<c,t>.getocclass: c; var   classimport: tocimport;   clsid: pointer;   itypeinfo: ptypeinfo;   ctypeinfo: ptypeinfo; begin   itypeinfo := typeinfo(t);   ctypeinfo := typeinfo(c);   clsid := objc_getclass(marshaledastring(shortstrtoutf8string(@itypeinfo^.name)));    fclassvtable := tocvtable.create(ctypeinfo, false);   classimport := tocimport.create(clsid, nil, fclassvtable);   classimport.queryinterface(gettypedata(ctypeinfo)^.guid, focclass);   result := focclass; end;   class function tocgenericimport<c,t>.wrap(p: pointer): t; var   objid: pointer;   obj: tocimport;   itypeinfo: ptypeinfo; begin   itypeinfo := typeinfo(t);   obj := tocimport.create(p, nil, getinstancevtable);   obj.queryinterface(gettypedata(itypeinfo)^.guid, result); end;    class function tpath.internalgetmacospath(const searchedpath: nssearchpathdirectory; const searchmask: nssearchpathdomainmask): string; var   nsfile: nsfilemanager;   url: nsurl; begin   nsfile := tnsfilemanager.wrap(tnsfilemanager.occlass.defaultmanager);   url := nsfile.urlfordirectory(searchedpath, searchmask, nil, true, nil);


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