VB應用XMLHTTP完成Post與Get的辦法

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本文所述為visual basic6.0的一個模塊辦法，是應用XMLHTTP完成Post與Get功效，固然是一個老代碼，然則可以替換Inet控件，完成數據通信。很值得進修自創一下。

重要模塊代碼以下：

'==========================================================
'| 模 塊 名 | XMLHTTP
'| 說  明 | 替換Inet控件，完成數據通信
'==========================================================Public Enum DataEnum
  ResponseText = 1
  ResponseBody = 2
End Enum
 
Public Function GetData(ByVal Url As String, ByVal DataStic As DataEnum) As Variant
  
  On Error GoTo ERR:
  Dim XMLHTTP As Object
  Dim DataS As String
  Dim DataB() As Byte
  
  Set XMLHTTP = CreateObject("Microsoft.XMLHTTP")
  
  XMLHTTP.Open "get", Url, True
  XMLHTTP.send
  
  While XMLHTTP.ReadyState <> 4
    DoEvents
  Wend
  '--------------------------------------函數前往
  Select Case DataStic
  Case ResponseText
    '--------------------------------直接前往字符串
    DataS = XMLHTTP.ResponseText
    GetData = DataS
  Case ResponseBody
    '--------------------------------直接前往二進制
    DataB = XMLHTTP.ResponseBody
    GetData = DataB
  Case ResponseBody + ResponseText
    '------------------------------二進制轉字符串[直接前往字串湧現亂碼時測驗考試]
    DataS = BytesToStr(XMLHTTP.ResponseBody)
    GetData = DataS
  Case Else
    '--------------------------------有效的前往
    GetData = ""
  End Select
  '--------------------------------------釋放空間
  Set XMLHTTP = Nothing
  Exit Function
ERR:
  GetData = ""
End Function
 
Public Function PostData(ByVal StrUrl As String, ByVal StrData As String, ByVal DataStic As DataEnum) As Variant
  On Error GoTo ERR:
  
  Dim XMLHTTP As Object
  Dim DataS As String
  Dim DataB() As Byte
  
  Set XMLHTTP = CreateObject("Microsoft.XMLHTTP")
  
  XMLHTTP.Open "POST", StrUrl, True
  XMLHTTP.setRequestHeader "Content-Length", Len(PostData)
  XMLHTTP.setRequestHeader "CONTENT-TYPE", "application/x-www-form-urlencoded"
  XMLHTTP.send (StrData)
  
  Do Until XMLHTTP.ReadyState = 4
    DoEvents
  Loop
  '-----------------------------函數前往
  Select Case DataStic
  Case ResponseText
    '--------------------------------直接前往字符串
    DataS = XMLHTTP.ResponseText
    PostData = DataS
  Case ResponseBody
    '--------------------------------直接前往二進制
    DataB = XMLHTTP.ResponseBody
    PostData = DataB
  Case ResponseBody + ResponseText
    '---------------------------二進制轉字符串[直接前往字串湧現亂碼時測驗考試]
    DataS = BytesToStr(XMLHTTP.ResponseBody)
    PostData = DataS
  Case Else
    '--------------------------------有效的前往
    PostData = ""
  End Select
  '------------------------------------釋放空間
  Set XMLHTTP = Nothing
  Exit Function
ERR:
  PostData = ""
End Function
 
Function BytesToStr(ByVal vIn) As String
  strReturn = ""
  For i = 1 To LenB(vIn)
    ThisCharCode = AscB(MidB(vIn, i, 1))
    If ThisCharCode < &H80 Then
      strReturn = strReturn & Chr(ThisCharCode)
    Else
      NextCharCode = AscB(MidB(vIn, i + 1, 1))
      strReturn = strReturn & Chr(CLng(ThisCharCode) * &H100 + CInt(NextCharCode))
      i = i + 1
    End If
  Next
  BytesToStr = strReturn
End Function