Now I have a ImageData file,but I don't know its data type,I want to transform it to BMP type.How to do? Thanks for your reply. ----------------------------------------------------------- 网易126专业电子邮局，为您提供卓越电子邮件服务，http://www.126.com/ 全国最大的免费邮箱，260兆空间12兆附件，强力杀毒反垃圾，界面无广告