Option Explicit
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' Copyright ©1996-2011 VBnet/Randy Birch, All Rights Reserved.
' Some pages may also contain other copyrights by the author.
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' on any media without express permission.
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Private Declare Function InternetGetConnectedState Lib "wininet" _
(ByRef dwFlags As Long, _
ByVal dwReserved As Long) As Long
'Local system uses a modem to connect to the Internet.
Private Const INTERNET_CONNECTION_MODEM As Long = &H1
'Local system uses a LAN to connect to the Internet.
Private Const INTERNET_CONNECTION_LAN As Long = &H2
'Local system uses a proxy server to connect to the Internet.
Private Const INTERNET_CONNECTION_PROXY As Long = &H4
'No longer used.
Private Const INTERNET_CONNECTION_MODEM_BUSY As Long = &H8
Private Const INTERNET_RAS_INSTALLED As Long = &H10
Private Const INTERNET_CONNECTION_OFFLINE As Long = &H20
Private Const INTERNET_CONNECTION_CONFIGURED As Long = &H40
Private Sub Command1_Click()
Text1.Text = IsNetConnectViaLAN()
Text2.Text = IsNetConnectViaModem()
Text3.Text = IsNetConnectViaProxy()
Text4.Text = IsNetConnectOnline()
Text5.Text = IsNetRASInstalled()
Text6.Text = GetNetConnectString()
End Sub
Private Function IsNetConnectViaLAN() As Boolean
Dim dwflags As Long
'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)
'return True if the flags indicate a LAN connection
IsNetConnectViaLAN = dwflags And INTERNET_CONNECTION_LAN
End Function
Private Function IsNetConnectViaModem() As Boolean
Dim dwflags As Long
'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)
'return True if the flags indicate a modem connection
IsNetConnectViaModem = dwflags And INTERNET_CONNECTION_MODEM
End Function
Private Function IsNetConnectViaProxy() As Boolean
Dim dwflags As Long
'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)
'return True if the flags indicate a proxy connection
IsNetConnectViaProxy = dwflags And INTERNET_CONNECTION_PROXY
End Function
Private Function IsNetConnectOnline() As Boolean
'no flags needed here - the API returns True
'if there is a connection of any type
IsNetConnectOnline = InternetGetConnectedState(0&, 0&)
End Function
Private Function IsNetRASInstalled() As Boolean
Dim dwflags As Long
'pass an empty variable into which the API will
'return the flags associated with the connection
Call InternetGetConnectedState(dwflags, 0&)
'return True if the flags include RAS installed
IsNetRASInstalled = dwflags And INTERNET_RAS_INSTALLED
End Function
Private Function GetNetConnectString() As String
Dim dwflags As Long
Dim msg As String
'build a string for display
If InternetGetConnectedState(dwflags, 0&) Then
If dwflags And INTERNET_CONNECTION_CONFIGURED Then
msg = msg & "You have a network connection configured." & vbCrLf
End If
If dwflags And INTERNET_CONNECTION_LAN Then
msg = msg & "The local system connects to the Internet via a LAN"
End If
If dwflags And INTERNET_CONNECTION_PROXY Then
msg = msg & ", and uses a proxy server. "
Else
msg = msg & "."
End If
If dwflags And INTERNET_CONNECTION_MODEM Then
msg = msg & "The local system uses a modem to connect to the Internet. "
End If
If dwflags And INTERNET_CONNECTION_OFFLINE Then
msg = msg & "The connection is currently offline. "
End If
If dwflags And INTERNET_CONNECTION_MODEM_BUSY Then
msg = msg & "The local system's modem is busy with a non-Internet connection. "
End If
If dwflags And INTERNET_RAS_INSTALLED Then
msg = msg & "Remote Access Services are installed on this system."
End If
Else
msg = "Not connected to the internet now."
End If
GetNetConnectString = msg
End Function Write, Run & Share VB.net code online using OneCompiler's VB.net online compiler for free. It's one of the robust, feature-rich online compilers for VB.net language, running on the latest version 16. Getting started with the OneCompiler's VB.net compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as VB.net. OneCompiler also has reference programs, where you can look for the sample code to get started with.
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Visual Basic is a event driven programming language by Microsoft, first released in the year 1991.
Variable is a name given to the storage area in order to identify them in our programs.
Simple syntax of Variable declaration is as follows
Dim variableName [ As [ New ] dataType ] [ = initializer ]
variableName = value
If condition-expression Then
'code
End If
If(conditional-expression)Then
'code if the conditional-expression is true
Else
'code if the conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
Else If(conditional-expression) Then
'code if the above conditional-expression is true
Else
'code if the above conditional-expression is false
End If
If(conditional-expression)Then
'code if the above conditional-expression is true
If(conditional-expression)Then
'code if the above conditional-expression is true
End If
End If
Select [ Case ] expression
[ Case expressionlist
'code ]
[ Case Else
'code ]
End Select
For counter [ As datatype ] = begin To end [ Step step ]
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ counter ]
For Each element [ As datatype ] In group
'code
[ Continue For ]
'code
[ Exit For ]
'code
Next [ element ]
While conditional-expression
'Code
[ Continue While ]
'Code
[ Exit While ]
'Code
End While
Do { While | Until } conditional-expression
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop
Do
'Code
[ Continue Do ]
'Code
[ Exit Do ]
'Code
Loop { While | Until } conditional-expression
Procedure is a sub-routine which contains set of statements. Usually Procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Procedures are of two types.
Functions return a value when they are called.
[accessModifiers] Function functionName [(parameterList)] As returnType
'code
End Function
Sub-procedures are similar to functions but they don't return any value.
Sub ProcedureName (parameterList)
'Code
End Sub