objective c - Display NSImage on a CALayer -

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i've been trying display nsimage on calayer. realised need convert cgimage apparently, display it...

i have code doesn't seem working

calayer *layer = [calayer layer];      nsimage *findericon = [[nsworkspace sharedworkspace] iconforfiletype:nsfiletypeforhfstypecode(kfindericon)];     [findericon setsize:(nssize){ 128.0f, 128.0f }];      cgimagesourceref source;     source = cgimagesourcecreatewithdata((cfdataref)findericon, null);     cgimageref finalicon =  cgimagesourcecreateimageatindex(source, 0, null);      layer.bounds = cgrectmake(128.0f, 128.0f, 4, 4);     layer.position = cgpointmake(128.0f, 128.0f);     layer.contents = finalicon;          // insert layer root layer     [mainlayer addsublayer:layer];

why? how can work?

from comments: actually, if you're on 10.6, can set calayer's contents nsimage rather cgimageref...

if you're on os x 10.6 or later, take @ nsimage's cgimageforproposedrect:context:hints: method.

if you're not, i've got in category on nsimage:

-(cgimageref)cgimage {     cgcontextref bitmapctx = cgbitmapcontextcreate(null/*data - pass null let cg allocate memory*/,                                                     [self size].width,                                                      [self size].height,                                                     8 /*bitspercomponent*/,                                                     0 /*bytesperrow - cg calculate if it's allocating data.  might padded out bit better alignment*/,                                                     [[nscolorspace genericrgbcolorspace] cgcolorspace],                                                     kcgbitmapbyteorder32host|kcgimagealphapremultipliedfirst);      [nsgraphicscontext savegraphicsstate];     [nsgraphicscontext setcurrentcontext:[nsgraphicscontext graphicscontextwithgraphicsport:bitmapctx flipped:no]];     [self drawinrect:nsmakerect(0,0, [self size].width, [self size].height) fromrect:nszerorect operation:nscompositecopy fraction:1.0];     [nsgraphicscontext restoregraphicsstate];      cgimageref cgimage = cgbitmapcontextcreateimage(bitmapctx);     cgcontextrelease(bitmapctx);      return (cgimageref)[(id)cgimage autorelease]; }

i think wrote myself. it's entirely possible ripped off somewhere else stack overflow. it's older personal project , don't remember.


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