Use ADO stream for base64 encoding and decoding

'*************************************** * <Br/> '* Module name: modbase64.bas <br/> '* module functions: base64 encoding and decoding functions <br/>' * Author: lyserver <br/> '********************************** * ***** </P> <p> Option explicit </P> <p> '-------------------------------------------------<br/>' function description: base64 encoding <br/> '---------------------------------------------<br/> Public Function base64encode (Varin as variant) as string <br/> dim adostream as object <br/> dim xmldoc as object <br/> dim xmlnode as object </P> <p> set adostream = Createobject ("ADODB. stream ") <br/> adostream. charset = "gb2312" <br/> If vartype (Varin) = vbstring then <br/> adostream. type = 2 'adtypetext <br/> adostream. open <br/> adostream. writetext Varin <br/> elseif vartype (Varin) = vbbyte or vbarray then <br/> adostream. type = 1 'adtypebinary <br/> adostream. open <br/> adostream. write Varin <br/> else <br/> exit function <br/> end if <br/> adostream. position = 0 <br/> adostream. type = 1 'adtypebinary </P> <p> set xmldoc = Createobject ("msxml2.domdocument") <br/> set xmlnode = xmldoc. createelement ("mynode") <br/> xmlnode. datatype = "bin. base64 "<br/> xmlnode. nodetypedvalue = adostream. read <br/> base64encode = xmlnode. text <br/> adostream. close <br/> end function </P> <p> '---------------------------------------------<br/>' function description: base64 decoding <br/> '-------------------------------------------<br/> Public Function base64decode (Varin as variant, optional byval returnvaluetype as vbvartype = vbstring) as byte () <br/> dim adostream as object <br/> dim xmldoc as object <br/> dim xmlnode as object </P> <p> set xmldoc = Createobject ("msxml2.domdocument ") <br/> set xmlnode = xmldoc. createelement ("mynode") <br/> xmlnode. datatype = "bin. base64 "<br/> If vartype (Varin) = vbstring then <br/> xmlnode. TEXT = Replace (Varin, vbcrlf, "") <br/> elseif vartype (Varin) = vbbyte or vbarray then <br/> xmlnode. TEXT = Replace (strconv (Varin, vbunicode), vbcrlf ,"") <br/> else <br/> exit function <br/> end if </P> <p> set adostream = Createobject ("ADODB. stream ") <br/> adostream. charset = "gb2312" <br/> adostream. type = 1 'adtypebinary <br/> adostream. open <br/> adostream. write xmlnode. nodetypedvalue <br/> adostream. position = 0 <br/> If returnvaluetype = vbstring then <br/> adostream. type = 2 'adtypetext <br/> base64decode = adostream. readtext <br/> else <br/> base64decode = adostream. read <br/> end if <br/> adostream. close <br/> end Function