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			E-book. Free VB eBook - The most elementary single-thread Proxy in Visual Basic. In creating this manual we set ourselves the task to develop a minimum program code playing the role of Proxy-server (transmitting information from one port to another). It is easy to add filtration functions to the program (it will be shown in the supplement), log records, information substitution records (link addresses, advertisement in HTML - for web site promotion).  [ >>>> ]           Create standard Visual Basic project. Deploy element Label “this computer’s IP” on the form                    Connect a new Winsock component to the project for work with the network according to TCP/IP protocol                         - Winsock component      Free Visual Basic ebooks     Deploy two Winsock copies on the form. Winsock1 – for the server part and Oflameron for the client part. The server part (Winsock1) receives queries from the Web-browser (for example, Internet Explorer) through the port, for example, 125 and transmits it to the client part. The client part Oflameron (Winsock2) through standard port 80 transmits queries to the real Web-server.    VB ebook >>>>  Free ebook >>>>  Free Visual Basic ebook >>>>  Free download >>>>
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			Write the Proxy server part          Private Sub Form_Load()     Form1.Visible = True     Do  ''Switch the server part to port listening ( Listen )       If Winsock1.State <> sckConnected And Winsock1.State <> sckListening Then  ''If there is no connection yet and the port cannot be heard       Beep         Winsock1.Close  ''Close the connection         Winsock1.LocalPort = 125  ''Port number for listening         Winsock1.Listen  ''Begin listening port 125       End If       DoEvents     Loop ''Repeat     End Sub          Connections processing          Private Sub Winsock1_ConnectionRequest(ByVal requestID As Long)  ''If there is query for connection     Winsock1.Close  ''Stop listening the port     Winsock1.Accept requestID  ''Connect the client (browser) according to the number of the query     End Sub          Winsock1_ConnectionRequest – query for connection

Announce the variable     Dim ToServer As String  ''To send the query from the client part of Proxy to Web-server               Private Sub Winsock1_DataArrival(ByVal bytesTotal As Long)  ''Processing of incoming data (queries from Web-browser)     Dim ServerData As String  ''Announce the variable for the received data ServerData     Winsock1.GetData ServerData  ''Accept data into the variable     ToServer = ServerData  ''Copy the query into the variable for sending to the Web-server     Oflameron_SendToWebserver  ''Send the query to the Web-server     End Sub          Line “ToServer = ServerData” - is not mandatory, it is worthwhile, if it is necessary to process data writing in the log, filter, search for data in queries, substitute information (for example, change URL in downloaded web-pages for one’s own) etc.          The entire VB project of this development stage is in the file vbpt1.zip            Free Visual Basic ebook >>>>  Free VB ebook >>>>  Free ebook >>>>  Ebook download >>>> Free VB ebooks          Write the Client part of Proxy          For work with real Web-server. Connection to Web-server, sending of queries and data receipt.          Announce the variables          Dim Webport  ''Port number     Dim Data As String  ''To receive data from Web-server          Private Sub Oflameron_SendToWebserver()  ''Connect to Web-server     Oflameron.Close  ''Close the connection     Oflameron.RemoteHost = "10.62.182.54"  ''Web-server address or its IP address     Oflameron.RemotePort = 80  ''Port number. Standard for HTTP     Oflameron.Connect  ''Connect to Web-server       Webport = Oflameron.RemotePort  ''Remember the port number (optional line)     End Sub          Procedure Oflameron_Connect performs actions as soon as the Web-server is connected          Private Sub Oflameron_Connect()  ''Sent query to Web-server     If Oflameron.State <> sckConnected Then Exit Sub  ''Check. If there is no connection, abandon the procedure     Oflameron.SendData ToServer  ''Send the query line to the Web-server     End Sub          The procedure of data receipt from the Web-server          Private Sub Oflameron_DataArrival(ByVal bytesTotal As Long)  ''The call will be initiated as soon as some data is received from the Web-server       Text1.Text = Oflameron.State     If Oflameron.State <> sckClosing Then       Oflameron.GetData Data  ''It will contain data obtained from the Web-server       Winsock1.SendData Data  ''Send the obtained data from Web server to Web-browser     End If     End Sub

- put port number 125 for the server part of Proxy          Change Proxy and port settings in Internet Explorer, if you use IE                    So that queries were sent to our Proxy                    LAN adjustment                    Where - the address of our Proxy (IP-address of your computer) and port 125, which will listen to the server part of your Proxy          Upload the page from the Web-server to Internet Explorer website                    Proxy-server operates –sends queries and received data.      Visual Basic ebooks     This is a working example of a most elementary Proxy-server in the minimal code configuration. It allows to understand important specifics of network programming, create a working copy of the program.          The entire VB project of this development stage is in the file vbpt2.zip          flashcardspdf.zip >>     Full archive - 56 Mbytes in ZIP from Google Drive. No preview. Download only                Neural Networks

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