VB实现URL编码与解码

Private Sub Command1_Click()
Text2.Text = URLEncode(Text1.Text)
End Sub


Public Function URLEncode(ByRef strURL As String) As String
Dim I As Long
Dim tempStr As String
For I = 1 To Len(strURL)
If Asc(Mid(strURL, I, 1)) < 0 Then
tempStr = "%" & Right(CStr(Hex(Asc(Mid(strURL, I, 1)))), 2)
tempStr = "%" & Left(CStr(Hex(Asc(Mid(strURL, I, 1)))), Len(CStr(Hex(Asc(Mid(strURL, I, 1))))) - 2) & tempStr
URLEncode = URLEncode & tempStr
ElseIf (Asc(Mid(strURL, I, 1)) >= 65 And Asc(Mid(strURL, I, 1)) <= 90) or (Asc(Mid(strURL, I, 1)) >= 97 And Asc(Mid(strURL, I, 1)) <= 122) Then
URLEncode = URLEncode & Mid(strURL, I, 1)
Else
URLEncode = URLEncode & "%" & Hex(Asc(Mid(strURL, I, 1)))
End If
Next
End Function

Public Function URLDecode(ByRef strURL As String) As String
Dim I As Long

If InStr(strURL, "%") = 0 Then URLDecode = strURL: Exit Function

For I = 1 To Len(strURL)
If Mid(strURL, I, 1) = "%" Then
If Val("&H" & Mid(strURL, I + 1, 2)) > 127 Then
URLDecode = URLDecode & Chr(Val("&H" & Mid(strURL, I + 1, 2) & Mid(strURL, I + 4, 2)))
I = I + 5
Else
URLDecode = URLDecode & Chr(Val("&H" & Mid(strURL, I + 1, 2)))
I = I + 2
End If
Else
URLDecode = URLDecode & Mid(strURL, I, 1)
End If
Next
End Function

Private Sub Command2_Click()
Text3.Text = URLDecode(Text2.Text)
End Sub

Private Sub Form_Load()
Text1.Text = "微迈互联"
End Sub  

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