Manipulate image correct?

code:

- (char *)getframebuffer { cgimageref imageref = cgdisplaycreateimage(displayid); if(imageref  == null)    return null;  cgcontextref context = [size="3"][color="red"]createargbbitmapcontext[/color][/size](imageref ); if(context == null)   return null;  size_t w = cgimagegetwidth(imageref ); size_t h = cgimagegetheight(imageref); cgrect rect = {{0,0},{w,h}};  rfblog("111"); cgcontextdrawimage(context, rect,imageref ); rfblog("222");   char *returnvalue = (char *)cgbitmapcontextgetdata(context);  return returnvalue; }    /////////////////////////////////////////////// cgcontexref createargbbitmapcontext(cgimageref inimage) { int bitmapbytesperrow; int bitmapbytecount; cgcolorspaceref colorspace; char *bitmapdata; cgcontextref context = null; size_t pixelswidth = cgimagegetwidth(inimage); size_t pixelsheight = cgimagegetheight(inimage); bitmapbytesperrow = pixelswidth * 4; bitmapbytecount = bitmapbytesperrow  * pixelsheight ; colorspace = cgcolorspacecreatewithname(kcgcolorspacegenericrgb); if(colorspace == null )   return null;  bitmapdata = (char *)malloc(sizeof(char ) * bitmapbytecount  ); if(bitmapdata== null )  {    cgcolorspacerelease（colorspace）；    return null;  }     context = cgbitmapcontextcreate（bitmapdata，                                     pixelswidth ，                                     pixelsheight，                                     8，                                     bitmapbytesperrow ，                                     colorspace ，                                     kcgimagealphapremultipliedlast）;   if(context == null)      free(bitmapdata);    cgcolorspacerelease(colorspace);    return context; }

code error "cgimagedatalock : cannot allocate memory" after printing "111".

spent time on still don't find reason。

thks!!!

 

what trying image?

 

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