ASP关于编码的几个有用的函数小结(utf8)

1、'UTF转GB---将UTF8编码文字转换为GB编码文字

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 x<2^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

2、'GB转UTF8--将GB编码文字转换为UTF8编码文字

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

3、'GB转unicode---将GB编码文字转换为unicode编码文字

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_unicode&chr(38) 
Str_unicode=Str_unicode&chr(35) 
Str_unicode=Str_unicode&chr(120) 
Str_unicode=Str_unicode& Hex(ascw(Str_one)) 
Str_unicode=Str_unicode&chr(59) 
next 
chinese2unicode=Str_unicode 
end function

4、'URL解码

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 v<128 then 
deStr=deStr&chr(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=deStr&chr(v) 
i=i+5 
else 
v=eval("&h"+Mid(enStr,i+1,2)+cstr(hex(asc(Mid(enStr,i+3,1))))) 
deStr=deStr&chr(v) 
i=i+3 
end if 
else 
destr=destr&c 
end if 
end if 
else 
if c="+" then 
deStr=deStr&" " 
else 
deStr=deStr&c 
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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