A simple qusetion, when do we use DIB or DDB? and how to use?
Such like windows? when we save raster image to disk we use dib,
we want to display raster image on screen we use ddb?
I dont think so.
I think when we use ddb we can save the screen by IDisPlay_GetDeviceBitMap
then we use IBitMap_CreateCompatibleBitMap to set up .
When we use Dib we USe IDisPlay_CreateDIBitmap.
Is it right?
I have already read the API Reference,but I still dont understand the stucture
and use time like IFont ,IDisplay or IDIB ,DDb. What should I read up?
or should I read the api reference at length? But where have the example
to read or have any document should I must read?

thank!