iphone - How to save image from NSData after doing the action of appendData? -

i want save image nsdata after appending additional bytes nsmutabledata. below sample code requirement.

nsdata *sourcedata = = uiimagejpegrepresentation([info objectforkey:@"uiimagepickercontrolleroriginalimage"], 1);  nsmutabledata *concatenateddata = [nsmutabledata data]; [concatenateddata appenddata:sourcedata]; [concatenateddata appenddata:sourcedata];  uiimage *myfinalimage = [[uiimage alloc] initwithdata:concatenateddata];  uiimagewritetosavedphotosalbum(myfinalimage, self, nil, nil);  

i appending sourcedata 2 times final image saving 1 sourcedata bytes.

am missing here?

here sample:

cgsize newsize = cgsizemake({here give width}, {here give height});      uiimage *myfinalimage1 = [[uiimage alloc] initwithdata:concatenateddata];        uiimage *myfinalimage2 = [[uiimage alloc] initwithdata:concatenateddata];           // set width height values.         cgsize newsize = cgsizemake(width, height);         uigraphicsbeginimagecontext( newsize );          [myfinalimage1 drawinrect:cgrectmake(0,0,newsize.width,newsize.height)];          [myfinalimage2 drawinrect:cgrectmake(newsize.width,newsize.height,newsize.width,newsize.height*2) blendmode:kcgblendmodenormal alpha:1.0];          uiimage *mergedimage = uigraphicsgetimagefromcurrentimagecontext();          uigraphicsendimagecontext();