Validate Availability of A File on The Web via The URL

Category:

C#, VB.NET, ASP.NET

Type:

Snippets

Difficulty:

Beginning

Author:

Anonymous

Version Compatibility: Visual Basic.NET

More information:

This code is a simple snippet that allows you to check if the full URL path, and the file to which it points exists. Many of the snippets available on-line only show how to check or validate the www.xxx.com part of the URL. This handles both.

Instructions: Copy the declarations and code below and paste directly into your VB project.

Declarations:
Imports System.Net

Code:

Public Sub veriftyURL(ByRef theURL As String)
        ' Created by: Richard C. Daniels, WSDOT, Office of Information Technology
        ' Created on: 2/6/2007
        ' Purpose: This procedure takes a filename or URL as input and verifies if the
        ' file exits at the specified location. Used by the 'Verify Path' button
        ' on the Projection, Data, and Template screen. Requires System.Net.
        Dim theClient As Net.WebClient = New Net.WebClient
        Dim theStream As Stream

If Left(theURL, 7).ToUpper = "HTTP://" Then
            Try
                theStream = theClient.OpenRead(theURLe)
                MsgBox("The selected HTTP path exists.", MsgBoxStyle.Information, "Information")
            Catch e As Exception
                MsgBox("The selected HTTP path does not exist or is invalid.", MsgBoxStyle.Information, "Information")
            End Try
        Else
        MsgBox("Not a valid URL, can not verify the HTTP path.", MsgBoxStyle.Information, "Information")
        End If
        theStream = Nothing
    End Sub