Hi there! I wanna create my own custom file format which em-beds and
holds a bitmap image and some text within the file.(let's call it .dip)

When the user serializes(saves) the file, I wanna store the data bits
and information about the bitmap in member variables, so that when the
file is saved, the file size will be much much lighter, cos' the bitmap
isn't physically saved to disk, just the information about the bitmap,
so that when the user clicks the Open menu item, the bitmap bits and
information are read and united into a bitmap at run-time.

Hope u can reply and give me your views! Thanks! :-D