asp中有关字符编码转换的几个函数

asp中有关字符编码转换的几个函数

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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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