objective c - Copy a directory including all contents and subdirectories -

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i'm making mac app , i'm trying copy content , subdirectory of folder , paste another.
i've tried files being copied. there way that?
i'm using copyitematpath: api , here of code:

nsstring *partsfromstring = ksppartsfrompathstring; nsstring *partstostring = ksppartstopathstring;  nserror  *error  = nil; manager = [nsfilemanager defaultmanager];  bool result = [manager copyitematpath:partsfromstring topath:partstostring error:&error];  if (!result && error) {     nslog(@"there error copying file directory! %@", [error localizeddescription]); }


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