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Tip of the Day
Language: VB5,VB6
Expertise: beginner
Oct 13, 2001



Application Security Testing: An Integral Part of DevOps

Check for a valid URL

Before posting an Internet request you should check that the user has entered a valid Internet address. You can do this with a parsing routine, or use the following routine based on the IE5 library:

Private Declare Function IsValidURL Lib "urlmon" (ByVal pBC As Long, _
    url As Byte, ByVal dwReserved As Long) As Long
Dim url As String
Dim b() As Byte

url = "http://www.vb2themax.com/default.asp"
' We need this because we're passing a Unicode string
b = url & vbNullChar

If IsValidURL(0, b(0), 0) = 0 Then    
    ' valid URL
    ' invalid URL
End If

Francesco Balena
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