Internet Status
Determines if a connection to the internet has been established, also retrieves the type of connection. I recently submitted an article entry titled Internet Status. The methods in which I used to determine the same information was incorrectly used as I was miss-informed by ApiViewer 2002. I have resolved those problems. PS. Don't ever depend on APIViewer for accurate Function declarations.
AI
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كود المصدر
<pre>Private Declare Function InternetGetConnectedState Lib "wininet.dll" (ByRef lpdwFlags As Long, ByVal dwReserved As Long) As Integer Private Const INTERNET_CONNECTION_PROXY = &H4 Private Const INTERNET_CONNECTION_CONFIGURED = &H40 Private Const INTERNET_CONNECTION_LAN = &H2 Private Const INTERNET_CONNECTION_MODEM = &H1 Private Const INTERNET_RAS_INSTALLED = &H10 Private Const INTERNET_CONNECTION_OFFLINE = &H20 Private Type tConnectionStatus Connected As Boolean ConnectionType As String RASInstalled As Boolean End Type 'general declarations.... Private Function GetConnectionInfo(ConnectionStatus As tConnectionStatus) As Boolean Dim pdFlags& 'Dimensionalize pdFlags as long data type If InternetGetConnectedState(pdFlags&, 0) Then 'Call InternetGetConnectedState to initialize pdFlags with the current connection information flags GetConnectionInfo = True 'InterNetGetConnectedState function was successful, return true If (pdFlags& And INTERNET_CONNECTION_PROXY) = INTERNET_CONNECTION_PROXY Then 'Perform a Bitwise And operation to determine if the variable pdFlags specifies the Internet_Connection_Proxy constant ConnectionStatus.ConnectionType = "Local system uses a proxy server to connect to the Internet." 'Initialize ConnectionStatus's ConnectionType member with the appropriate connection description ConnectionStatus.Connected = True 'Initialize this structures Connected member End If If (pdFlags& And INTERNET_CONNECTION_CONFIGURED) = INTERNET_CONNECTION_CONFIGURED Then ConnectionStatus.Connected = True ConnectionStatus.ConnectionType = "Local system has a valid connection to the Internet, but it might or might not be currently connected." End If If (pdFlags& And INTERNET_CONNECTION_LAN) = INTERNET_CONNECTION_LAN Then ConnectionStatus.ConnectionType = "Local system uses a local area network to connect to the Internet." ConnectionStatus.Connected = True End If If (pdFlags& And INTERNET_CONNECTION_MODEM) = INTERNET_CONNECTION_MODEM Then ConnectionStatus.ConnectionType = "Local system uses a modem to connect to the Internet." ConnectionStatus.Connected = True End If If (pdFlags& And INTERNET_CONNECTION_OFFLINE) = INTERNET_CONNECTION_OFFLINE Then ConnectionStatus.ConnectionType = "Local system is in offline mode." ConnectionStatus.Connected = False End If If (pdFlags& And INTERNET_RAS_INSTALLED) = INTERNET_RAS_INSTALLED Then ConnectionStatus.RASInstalled = True End If End If End Function Private Sub Command1_Click() Dim MyConnectionStatus As tConnectionStatus 'Dimensionalize MyConnectionStatus as user-defined type structure tConnectionStatus GetConnectionInfo MyConnectionStatus 'See this sub routine for more info... MsgBox "Connected: " & MyConnectionStatus.Connected & vbCrLf & "Type: " & MyConnectionStatus.ConnectionType 'Show MsgBox modal dialog to display the connection info... End Sub</pre>
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