求ASP BASE64位编码的函数，请说明使用注意事项比如网页的编码什么的。

[wintergoes]

从网上找了不少代码，但是都不行，还行各位大侠帮忙，谢谢了。

[tantaiyizu]

自己用vb或vc写一个吧
然后在asp中去调用

[littlelam]

与网页编码无关，BASE64位编码的函数是将　字符串转换为　BASE64位编码
你看到的结果是BASE64位编码

[cow8063]

'-------------------------------------------------
'函数功能：文字加密解密Base64算法
'加密函数：base64Encode(str) as String
'解密函数：base64Decode(str) as String
'-------------------------------------------------
const BASE_64_MAP_INIT = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
dim nl
' zero based arrays
dim Base64EncMap(63)
dim Base64DecMap(127)

' must be called before using anything else
PUBLIC SUB initCodecs()
' init vars
nl = "<P>" & chr(13) & chr(10)
' setup base 64
dim max, idx
max = len(BASE_64_MAP_INIT)
for idx = 0 to max - 1
' one based string
Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1)
next
for idx = 0 to max - 1
Base64DecMap(ASC(Base64EncMap(idx))) = idx
next
END SUB

' encode base 64 encoded string
PUBLIC FUNCTION base64Encode(plain)
if len(plain) = 0 then
base64Encode = ""
exit function
end if
dim ret, ndx, by3, first, second, third
by3 = (len(plain) \ 3) * 3
ndx = 1
do while ndx <= by3
first = asc(mid(plain, ndx+0, 1))
second = asc(mid(plain, ndx+1, 1))
third = asc(mid(plain, ndx+2, 1))
ret = ret & Base64EncMap((first \ 4) AND 63 )
ret = ret & Base64EncMap(((first * 16) AND 48) + ((second \ 16) AND 15 ) )
ret = ret & Base64EncMap(((second * 4) AND 60) + ((third \ 64) AND 3 ) )
ret = ret & Base64EncMap(third AND 63)
ndx = ndx + 3
loop
' check for stragglers
if by3 < len(plain) then
first = asc(mid(plain, ndx+0, 1))
ret = ret & Base64EncMap((first \ 4) AND 63 )
if (len(plain) MOD 3 ) = 2 then
second = asc(mid(plain, ndx+1, 1))
ret = ret & Base64EncMap(((first * 16) AND 48) + ((second \16) AND 15 ))
ret = ret & Base64EncMap(((second * 4) AND 60))
else
ret = ret & Base64EncMap((first * 16) AND 48)
ret = ret & "="
end if
ret = ret & "="
end if
base64Encode = ret
END FUNCTION

' decode base 64 encoded string
PUBLIC FUNCTION base64Decode(scrambled)
if len(scrambled) = 0 then
base64Decode = ""
exit function
end if
' ignore padding
dim realLen
realLen = len(scrambled)
do while mid(scrambled, realLen, 1) = "="
realLen = realLen - 1
loop
dim ret, ndx, by4, first, second, third, fourth
ret = ""
by4 = (realLen \ 4) * 4
ndx = 1
do while ndx <= by4
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
third = Base64DecMap(asc(mid(scrambled, ndx+2, 1)))
fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1)))
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3))
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15) )
ret = ret & chr( ((third * 64) AND 255) + (fourth AND 63) )
ndx = ndx + 4
loop
' check for stragglers, will be 2 or 3 characters
if ndx < realLen then
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
ret = ret & chr( ((first * 4) AND 255) + ((second \ 16) AND 3))
if realLen MOD 4 = 3 then
third = Base64DecMap(asc(mid(scrambled,ndx+2,1)))
ret = ret & chr( ((second * 16) AND 255) + ((third \ 4) AND 15) )
end if
end if
base64Decode = ret
END FUNCTION

' initialize
call initCodecs