VB使用XMLHTTP实现Post与Get的方法
本文所述为visual basic6.0的一个模块方法，是使用XMLHTTP实现Post与Get功能，虽然是一个老代码，但是可以替代Inet控件，实现数据通讯。很值得学习借鉴一下。
主要模块代码如下：
'==========================================================
'| 模 块 名 | XMLHTTP
'| 说 明 | 替代Inet控件，实现数据通讯
'==========================================================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
'--------------------------------------函数返回
Select Case DataStic
Case ResponseText
'--------------------------------直接返回字符串
DataS = XMLHTTP.ResponseText
GetData = DataS
Case ResponseBody
'--------------------------------直接返回二进制
DataB = XMLHTTP.ResponseBody
GetData = DataB
Case ResponseBody + ResponseText
'------------------------------二进制转字符串[直接返回字串出现乱码时尝试]
DataS = BytesToStr(XMLHTTP.ResponseBody)
GetData = DataS
Case Else
'--------------------------------无效的返回
GetData = ""
End Select
'--------------------------------------释放空间
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
'-----------------------------函数返回
Select Case DataStic
Case ResponseText
'--------------------------------直接返回字符串
DataS = XMLHTTP.ResponseText
PostData = DataS
Case ResponseBody
'--------------------------------直接返回二进制
DataB = XMLHTTP.ResponseBody
PostData = DataB
Case ResponseBody + ResponseText
'---------------------------二进制转字符串[直接返回字串出现乱码时尝试]
DataS = BytesToStr(XMLHTTP.ResponseBody)
PostData = DataS
Case Else
'--------------------------------无效的返回
PostData = ""
End Select
'------------------------------------释放空间
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
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