ASP关于编码的几个有用的函数小结(utf8)

function UTF2GB(UTFStr)

for Dig=1 to len(UTFStr)
'如果UTF8编码文字以%开头则进行转换
if mid(UTFStr,Dig,1)="%" then
'UTF8编码文字大于8则转换为汉字
if len(UTFStr) >= Dig+8 then
GBStr=GBStr ConvChinese(mid(UTFStr,Dig,9))
Dig=Dig+8
else
GBStr=GBStr mid(UTFStr,Dig,1)
end if
else
GBStr=GBStr mid(UTFStr,Dig,1)
end if
next
UTF2GB=GBStr
end function

'UTF8编码文字将转换为汉字
function ConvChinese(x)
A=split(mid(x,2),"%")
i=0
j=0
for i=0 to ubound(A)
A(i)=c16to2(A(i))
next
for i=0 to ubound(A)-1
DigS=instr(A(i),"0")
Unicode=""
for j=1 to DigS-1
if j=1 then
A(i)=right(A(i),len(A(i))-DigS)
Unicode=Unicode A(i)
else
i=i+1
A(i)=right(A(i),len(A(i))-2)
Unicode=Unicode A(i)
end if
next

if len(c2to16(Unicode))=4 then
ConvChinese=ConvChinese chrw(int("H" c2to16(Unicode)))
else
ConvChinese=ConvChinese chr(int("H" c2to16(Unicode)))
end if
next
end function

'二进制代码转换为十六进制代码
function c2to16(x)
i=1
for i=1 to len(x) step 4
c2to16=c2to16 hex(c2to10(mid(x,i,4)))
next
end function

'二进制代码转换为十进制代码
function c2to10(x)
c2to10=0
if x="0" then exit function
i=0
for i= 0 to len(x) -1
if mid(x,len(x)-i,1)="1" then c2to10=c2to10+2^(i)
next
end function

'十六进制代码转换为二进制代码
function c16to2(x)
i=0
for i=1 to len(trim(x))
tempstr= c10to2(cint(int("h" mid(x,i,1))))
do while len(tempstr)4
tempstr="0" tempstr
loop
c16to2=c16to2 tempstr
next
end function

'十进制代码转换为二进制代码
function c10to2(x)
mysign=sgn(x)
x=abs(x)
DigS=1
do
if x2^DigS then
exit do
else
DigS=DigS+1
end if
loop
tempnum=x

i=0
for i=DigS to 1 step-1
if tempnum>=2^(i-1) then
tempnum=tempnum-2^(i-1)
c10to2=c10to2 "1"
else
c10to2=c10to2 "0"
end if
next
if mysign=-1 then c10to2="-" c10to2
end function

Function toUTF8(szInput)
Dim wch, uch, szRet
Dim x
Dim nAsc, nAsc2, nAsc3
'如果输入参数为空，则退出函数
If szInput = "" Then
toUTF8 = szInput
Exit Function
End If
'开始转换
For x = 1 To Len(szInput)
'利用mid函数分拆GB编码文字
wch = Mid(szInput, x, 1)
'利用ascW函数返回每一个GB编码文字的Unicode字符代码
'注：asc函数返回的是ANSI 字符代码，注意区别
nAsc = AscW(wch)
If nAsc 0 Then nAsc = nAsc + 65536

If (nAsc And HFF80) = 0 Then
szRet = szRet wch
Else
If (nAsc And HF000) = 0 Then
uch = "%" Hex(((nAsc \ 2 ^ 6)) Or HC0) Hex(nAsc And H3F Or H80)
szRet = szRet uch
Else
'GB编码文字的Unicode字符代码在0800 - FFFF之间采用三字节模版
uch = "%" Hex((nAsc \ 2 ^ 12) Or HE0) "%" _
Hex((nAsc \ 2 ^ 6) And H3F Or H80) "%" _
Hex(nAsc And H3F Or H80)
szRet = szRet uch
End If
End If
Next

toUTF8 = szRet
End Function

function chinese2unicode(Str)
dim i
dim Str_one
dim Str_unicode
if(isnull(Str)) then
exit function
end if
for i=1 to len(Str)
Str_one=Mid(Str,i,1)
Str_unicode=Str_unicodechr(38)
Str_unicode=Str_unicodechr(35)
Str_unicode=Str_unicodechr(120)
Str_unicode=Str_unicode Hex(ascw(Str_one))
Str_unicode=Str_unicodechr(59)
next
chinese2unicode=Str_unicode
end function

Function URLDecode(enStr)
dim deStr
dim c,i,v
deStr=""
for i=1 to len(enStr)
c=Mid(enStr,i,1)
if c="%" then
v=eval("h"+Mid(enStr,i+1,2))
if v128 then
deStr=deStrchr(v)
i=i+2
else
if isvalidhex(mid(enstr,i,3)) then
if isvalidhex(mid(enstr,i+3,3)) then
v=eval("h"+Mid(enStr,i+1,2)+Mid(enStr,i+4,2))
deStr=deStrchr(v)
i=i+5
else
v=eval("h"+Mid(enStr,i+1,2)+cstr(hex(asc(Mid(enStr,i+3,1)))))
deStr=deStrchr(v)
i=i+3
end if
else
destr=destrc
end if
end if
else
if c="+" then
deStr=deStr" "
else
deStr=deStrc
end if
end if
next
URLDecode=deStr
end function

'判断是否为有效的十六进制代码
function isvalidhex(str)
dim c
isvalidhex=true
str=ucase(str)
if len(str)>3 then isvalidhex=false:exit function
if left(str,1)>"%" then isvalidhex=false:exit function
c=mid(str,2,1)
if not (((c>="0") and (c="9")) or ((c>="A") and (c="Z"))) then isvalidhex=false:exit function
c=mid(str,3,1)
if not (((c>="0") and (c="9")) or ((c>="A") and (c="Z"))) then isvalidhex=false:exit function
end function
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