我有一段取得图片二进制数据的代码，我读不懂，希望各位大侠指点迷津！！

response.buffer=true formsize=request.totalbytes formdata=request.binaryread(formsize) ,一下的读不懂

bncrlf=chrB(13) & chrB(10) divider=leftB(formdata,clng(instrb(formdata,bncrlf))-1) datastart=instrb(formdata,bncrlf & bncrlf)+4 dataend=instrb(datastart+1,formdata,divider)-datastart mydata=midb(formdata,datastart,dataend)

在此先谢了！！！