Rails Flex接口 保存Flex传来的bytearray

	   open( "path999801.png", 'wb' ) do |fo|
	      byteArray[:pngBytes].pack('c*').each do |byte|
		    logger.debug("Hello Tommie#{byte} ")
		   fo<<byte
		   end
	   end

       dt=Time.now()
       path=RAILS_ROOT+"/public/images/snapshot/#{"snapshot"+dt.strftime('%Y%m%d%H%M%S')}.png"	   
	   fout = File.open( path, 'wb' );
	   data = byteArray[:pngBytes].pack('c*');
	   fout.puts(data);
	   fout.close
	   snap=Livesnap.new()
	   snap.update_attributes(:path=>path,:create_dt=>dt)

其中，对应pack和unpack的含义如下：

引用

   a = [ "a", "b", "c" ]
   n = [ 65, 66, 67 ]
   a.pack("A3A3A3")   #=> "a  b  c  "
   a.pack("a3a3a3")   #=> "a\000\000b\000\000c\000\000"
   n.pack("ccc")      #=> "ABC"

Directives for pack.

Directive    Meaning
---------------------------------------------------------------
     @     |  Moves to absolute position
     A     |  ASCII string (space padded, count is width)
     a     |  ASCII string (null padded, count is width)
     B     |  Bit string (descending bit order)
     b     |  Bit string (ascending bit order)
     C     |  Unsigned char
     c     |  Char
     D, d  |  Double-precision float, native format
     E     |  Double-precision float, little-endian byte order
     e     |  Single-precision float, little-endian byte order
     F, f  |  Single-precision float, native format
     G     |  Double-precision float, network (big-endian) byte order
     g     |  Single-precision float, network (big-endian) byte order
     H     |  Hex string (high nibble first)
     h     |  Hex string (low nibble first)
     I     |  Unsigned integer
     i     |  Integer
     L     |  Unsigned long
     l     |  Long
     M     |  Quoted printable, MIME encoding (see RFC2045)
     m     |  Base64 encoded string
     N     |  Long, network (big-endian) byte order
     n     |  Short, network (big-endian) byte-order
     P     |  Pointer to a structure (fixed-length string)
     p     |  Pointer to a null-terminated string
     Q, q  |  64-bit number
     S     |  Unsigned short
     s     |  Short
     U     |  UTF-8
     u     |  UU-encoded string
     V     |  Long, little-endian byte order
     v     |  Short, little-endian byte order
     w     |  BER-compressed integer\fnm
     X     |  Back up a byte
     x     |  Null byte
     Z     |  Same as ``a'', except that null is added with *

private function onSnapshot():void
            {
                var snapshot:ImageSnapshot = ImageSnapshot.captureImage(_traceBox);

                messageService.save_snapshot.send({image_buffer:_imageBuffer});
            }
            
            private function onSaveSnapshot(event:ResultEvent):void
            {
                if(event.result.hasOwnProperty("success"))
                {
                    if(event.result.success == true)
                    {
                        if(event.result.hasOwnProperty("file"))
                        {
                            trace("Save file \"" + event.result.file + "\" successfully.");
                        }
                    }
                }
                
                trace("Save file failed");
            }