(VB.NET) Use Socket Object for the Connection

The Chilkat Socket API provides many features for establishing connections, which includes the following:

• Connect through an HTTP proxy
• Connect through a SOCKS proxy
• Connect through an SSH tunnel
• Binding to a local IP address
• Client-side Certificates (two-way SSL/TLS)
• Public Key Pinning for TLS connections
• Controlling TLS ciphers

Rather than reproducing all of the properties and methods required for these features, the REST object can use a Socket object's connection by calling the UseConnection method. This allows for an application to use the features of the Socket API to establish the connection, and then use it from the REST API.

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' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' This example shows how to use the Chilkat socket object's connection.
Dim rest As New Chilkat.Rest
Dim socket As New Chilkat.Socket

' Establish the connection using the socket object:
Dim bTls As Boolean = True
Dim port As Integer = 443
Dim maxWaitMs As Integer = 5000
Dim success As Boolean = socket.Connect("www.alphavantage.co",port,bTls,maxWaitMs)
If (success <> True) Then
    Debug.WriteLine("Connect Failure Error Code: " & socket.ConnectFailReason)
    Debug.WriteLine(socket.LastErrorText)
    Exit Sub
End If


Dim bAutoReconnect As Boolean = True

' Use the connection:
success = rest.UseConnection(socket,bAutoReconnect)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' Get a stock quote:
' Sending GET request to https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=MSFT&apikey=my_api_key
success = rest.AddQueryParam("function","TIME_SERIES_DAILY")
success = rest.AddQueryParam("symbol","AAPL")
success = rest.AddQueryParam("apikey","my_api_key")
Dim responseJson As String = rest.FullRequestNoBody("GET","/query")
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


Debug.WriteLine(responseJson)

' Sample response:
' {
'     "Meta Data": {
'         "1. Information": "Daily Prices (open, high, low, close) and Volumes",
'         "2. Symbol": "AAPL",
'         "3. Last Refreshed": "2019-12-06",
'         "4. Output Size": "Compact",
'         "5. Time Zone": "US/Eastern"
'     },
'     "Time Series (Daily)": {
'         "2019-12-06": {
'             "1. open": "267.4800",
'             "2. high": "271.0000",
'             "3. low": "267.3000",
'             "4. close": "270.7100",
'             "5. volume": "25447644"
'         },
'         "2019-12-05": {
'             "1. open": "263.7900",
'             "2. high": "265.8900",
'             "3. low": "262.7300",
'             "4. close": "265.5800",
'             "5. volume": "18661343"
'         },
'         "2019-12-04": {
'             "1. open": "261.0700",
'             "2. high": "263.3100",
'             "3. low": "260.6800",
'             "4. close": "261.7400",
'             "5. volume": "16810388"
'         },
' ...
'         "2019-07-18": {
'             "1. open": "204.0000",
'             "2. high": "205.8800",
'             "3. low": "203.7000",
'             "4. close": "205.6600",
'             "5. volume": "18582161"
'         }
'     }
' }