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VB Examples

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Amazon S3
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VB Strings
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Download HTML Web Page

VB6 socket component example code showing how to download a simple HTML web page from a Web server.

Dim WithEvents socket As ChilkatSocket
Dim bAbort As Boolean

Private Sub AbortButton_Click()
    ' Cause the socket operation to be aborted in the next heartbeat callback.
    bAbort = True
End Sub

' The heartbeat event callback is called during blocking socket operations.
' If abort is set to True, the socket operation is aborted.
Private Sub socket_Heartbeat(ByVal objectID As Long, abort As Long)
    ' If abort is set to True, the socket operation is aborted.
    abort = bAbort
End Sub

Private Sub Command1_Click()

    Set socket = New ChilkatSocket
    bAbort = False
    
    socket.UnlockComponent "anything for 30-day trial"
    
    ' Get heartbeat event callbacks every .2 seconds to assure that
    ' the component is not hung.  The heartbeat event includes an abort
    ' flag that can be set by the application to abort the socket
    ' operation while in progress.
    socket.HeartbeatMs = 200
    
    ' The Chilkat Socket component provides a convenience method to
    ' build simple HTTP Get requests.
    Dim getReq As String
    getReq = socket.BuildHttpGetRequest("http://www.htmlfeed.com/")
    
    ' Connect to the web server.
    success = socket.Connect("www.htmlfeed.com", 80, 5000)
    If (success = 0) Then
        MsgBox socket.LastErrorText
        Exit Sub
    End If
    
    ' Send the HTTP GET.
    success = socket.SendString(getReq)
    If (success = 0) Then
        MsgBox socket.LastErrorText
        Exit Sub
    End If
    
    ' Internal to the socket component, read in 40K chunks
    socket.ReceivePacketSize = 40000
    
    ' Set the maximum idle time while reading to 10 seconds
    socket.MaxReadIdleMs = 10000
    
    ' Read the 1st line of the HTTP response, which is the
    ' status line, such as "HTTP/1.1 200 OK"
    Dim status As String
    status = socket.ReceiveUntilMatch(vbCrLf)
    If (Len(status) = 0) Then
        MsgBox socket.LastErrorText
        Exit Sub
    End If
    StatusLine.Text = status
    
    ' Now get the HTTP response header, which ends in a double CRLF
    Dim responseHeader As String
    responseHeader = socket.ReceiveUntilMatch(vbCrLf & vbCrLf)
    If (Len(responseHeader) = 0) Then
        MsgBox socket.LastErrorText
        Exit Sub
    End If
    HeaderText.Text = responseHeader
    
    ' Use the Chilkat MIME ActiveX to parse the HTTP response header.
    Dim mime As New ChilkatMime
    mime.UnlockComponent "anything for 30-day trial"
    
    mime.LoadMime responseHeader
    
    ' Get the Content-Length header field.
    Dim contentLenStr As String
    contentLenStr = mime.GetHeaderField("content-length")
    
    Dim contentLen As Integer
    contentLen = Val(contentLenStr)
    
    ' Read the exact number of bytes specified by contentLen
    ' Note: Percentage completion event callbacks are available
    ' for socket receive operations where the number of bytes to
    ' be received is known in advance.
    Dim htmlPage As Variant
    htmlPage = socket.ReceiveBytesN(contentLen)
    
    ' We have the HTML page as a Variant containing byte data.
    ' As we all know, HTML pages can use any charset encoding,
    ' such as utf-8, iso-8859-1, windows-1252, shift_JIS, etc.
    
    ' We'll now draw upon the Chilkat Charset ActiveX to determine
    ' the charset of the HTML page and convert it to a string for
    ' display.
    Dim cc As New ChilkatCharset2
    cc.UnlockComponent "anything for 30-day trial"
    
    CharsetText.Text = cc.GetHtmlCharset(htmlPage)
    If (Len(CharsetText.Text) = 0) Then
        ' No charset was specified within the HTML, assume windows-1252
        CharsetText.Text = "windows-1252"
    End If
    
    cc.FromCharset = CharsetText.Text
    HtmlText.Text = cc.ConvertToUnicode(htmlPage)
    
End Sub



 

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