生成HTTP组件
自己动手，丰衣足食，下面介绍如何生成自己的AspHttp组件。
使用Winsock控件，下面将介绍怎么来建立一个简单的HTTP组件。
记住先选择mswinsck.ocx控件
下面的代码是在VB6中编译的。
代码如下：
Private WithEvents objWinSock As MSWinsockLib.Winsock
Private strURL As String
Private strURI As String
Private strServer As String
Private nPort As Long
Private strHead As String
Private strData As String
Private bConnected As Boolean

Public Function httpGet(URL As String) As String
Set objWinSock = New MSWinsockLib.Winsock
strURL = URL
ParseURL
Connect
SendRequest
objWinSock.Close
strHead = Left(strData, InStr(strData, vbCrLf & vbCrLf))
strData = Right(strData, Len(strData) - InStr(strData, vbCrLf & vbCrLf))
httpGet = strData
End Function

Private Sub ParseURL()
If LCase(Left(strURL, 7)) = "http://" Then
If InStr(8, strURL, "/") = 0 Then
strServer = Right(strURL, Len(strURL) - 7)
strURI = "/"
Else
strServer = Mid(strURL, 8, InStr(8, strURL, "/") - 8)
strURI = Right(strURL, Len(strURL) - InStr(8, strURL, "/") + 1)
End If
If InStr(strServer, ":") <> 0 Then
nPort = CLng(Right(strServer, Len(strServer) - InStr(strServer,
":")))
strServer = Left(strServer, InStr(strServer, ":") - 1)
End If
If nPort = 0 Then nPort = 80
Else
Err.Raise vbObjectError, "Error", "错误的URL"
End If
End Sub

Private Sub Connect()
Dim dtStart As Date
dtStart = Now()
objWinSock.RemoteHost = strServer
objWinSock.RemotePort = nPort
objWinSock.Connect
Do Until bConnected
DoEvents
If DateDiff("s", dtStart, Now) > 30 Then
Err.Raise vbObjectError, "Error", "连接超时"
End If
Loop
End Sub

Private Sub SendRequest()
Dim strCmd
Dim dtStart As Date
dtStart = Now()
strCmd = "GET " & strURI & " HTTP/1.0" & vbCrLf
strCmd = strCmd & "User-Agent: aspHttp.http" & vbCrLf
strCmd = strCmd & "Accept: */*" & vbCrLf
strCmd = strCmd & vbCrLf
objWinSock.SendData strCmd
Do Until objWinSock.State = sckClosing
DoEvents
If DateDiff("s", dtStart, Now) > 60 Then
Err.Raise vbObjectError, "Error", "请求超时"
End If
Loop
End Sub

Public Property Get Head() As Variant
Head = strHead
End Property

Public Property Get Body() As Variant
Body = strData
End Property

Private Sub objWinSock_DataArrival(ByVal bytesTotal As Long)
Dim strTemp
objWinSock.GetData strTemp, vbString
strData = strData & strTemp
End Sub

Private Sub objWinSock_Connect()
bConnected = True
End Sub

Private Sub objWinSock_Error(ByVal Number As Integer, Description As String, _
ByVal Scode As Long, ByVal Source As String, ByVal HelpFile As String, _
ByVal HelpContext As Long, CancelDisplay As Boolean)

Err.Raise vbObjectError, "Error", "Winsock Error: " & Number &
vbCrLf & Descripti

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