Function strUnicodeLen(asContents) '计算unicode字符串的Ansi编码的长度 asContents1="a"&asContents len1=len(asContents1) k=0 for i=1 to len1 asc1=asc(mid(asContents1,i,1)) if asc1<0 then asc1=65536+asc1 if asc1>255 then k=k+2 else k=k+1 end if next strUnicodeLen=k-1 End Function
Function strUnicode2Ansi(asContents) '将Unicode编码的字符串，转换成Ansi编码的字符串 strUnicode2Ansi="" len1=len(asContents) for i=1 to len1 varchar=mid(asContents,i,1) varasc=asc(varchar) if varasc<0 then varasc=varasc+65536 if varasc>255 then varHex=Hex(varasc) varlow=left(varHex,2) varhigh=right(varHex,2) strUnicode2Ansi=strUnicode2Ansi & chrb("&H" & varlow ) & chrb("&H" & varhigh ) else strUnicode2Ansi=strUnicode2Ansi & chrb(varasc) end if next End function
Function strAnsi2Unicode(asContents) '将Ansi编码的字符串，转换成Unicode编码的字符串 strAnsi2Unicode = "" len1=lenb(asContents) if len1=0 then exit function for i=1 to len1 varchar=midb(asContents,i,1) varasc=ascb(varchar) if varasc > 127 then strAnsi2Unicode = strAnsi2Unicode & chr(ascw(midb(asContents,i+1,1) & varchar)) i=i+1 else strAnsi2Unicode = strAnsi2Unicode & chr(varasc) end if next End function
Function Base64encode(asContents) '将Ansi编码的字符串进行Base64编码 'asContents应当是ANSI编码的字符串（二进制的字符串也可以） Dim lnPosition Dim lsResult Dim Char1 Dim Char2 Dim Char3 Dim Char4 Dim Byte1 Dim Byte2 Dim Byte3 Dim SaveBits1 Dim SaveBits2 Dim lsGroupBinary Dim lsGroup64 Dim m4,len1,len2
len1=Lenb(asContents) if len1<1 then Base64encode="" exit Function end if
m3=Len1 Mod 3 If M3 > 0 Then asContents = asContents & String(3-M3, chrb(0)) '补足位数是为了便于计算
IF m3 > 0 THEN len1=len1+(3-m3) len2=len1-3 else len2=len1 end if
lsResult = ""
For lnPosition = 1 To len2 Step 3 lsGroup64 = "" lsGroupBinary = Midb(asContents, lnPosition, 3)
