ASP中有關字元編碼轉換的幾個有用函數

編碼|函數|轉換

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1、'UTF轉GB---將UTF8編碼文字轉換為GB編碼文字
function UTF2GB(UTFStr)

for Dig=1 to len(UTFStr)
  '如果UTF8編碼文字以%開頭則進行轉換
  if mid(UTFStr,Dig,1)="%" then
     'UTF8編碼文字大於8則轉換為漢字
    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編碼文字將轉換為漢字
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

'二進位代碼轉換為十六進位代碼
function c2to16(x)
   i=1
   for i=1 to len(x) step 4
      c2to16=c2to16 & hex(c2to10(mid(x,i,4)))
   next
end function

'二進位代碼轉換為十進位代碼
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

'十六進位代碼轉換為二進位代碼
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

'十進位代碼轉換為二進位代碼
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轉UTF8--將GB編碼文字轉換為UTF8編碼文字

Function toUTF8(szInput)
    Dim wch, uch, szRet
    Dim x
    Dim nAsc, nAsc2, nAsc3
    '如果輸入參數為空白，則退出函數
    If szInput = "" Then
        toUTF8 = szInput
        Exit Function
    End If
    '開始轉換
     For x = 1 To Len(szInput)
        '利用mid函數分拆GB編碼文字
        wch = Mid(szInput, x, 1)
        '利用ascW函數返回每一個GB編碼文字的Unicode字元代碼
        '註：asc函數返回的是ANSI 字元代碼，注意區別
        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編碼文字的Unicode字元代碼在0800 - FFFF之間採用三位元組模版
                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轉unicode---將GB編碼文字轉換為unicode編碼文字

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解碼
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

'判斷是否為有效十六進位代碼
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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