[dba-VB] VB.Net Wait for file to Download before launching

You can use a small text file on the drive as a flag.  Start it when you call the installer and then keep checking for it at intervals.  When it's no longer there (the installer removes it), launch the application.  Or you could do it the other way around and have the installer remove a file you create just before you call it.

Charlotte

-----Original Message-----
From: dba-vb-bounces at databaseadvisors.com [mailto:dba-vb-bounces at databaseadvisors.com] On Behalf Of David McAfee
Sent: Wednesday, January 20, 2010 2:28 PM
To: Discussion concerning Visual Basic and related programming issues.
Subject: [dba-VB] VB.Net Wait for file to Download before launching

Does anyone know how to do this?

I have this program that checks for updates :

            If IsUpdateAvailable() Then
                DownloadUpdate()
                LaunchUpdateInstaller()
                LaunchApp()
            Else
                LaunchApp()
            End If

The Update detection and Download work great:

    Private Sub DownloadUpdate()
        If Directory.Exists(InstallFilesPath) Then 'if the local path
exists then check for the actual file
            If File.Exists(InstallFilesPath + InstallFile) Then 'Check
to see if the new file is already installed
                'Delete file
                File.Delete(InstallFilesPath + InstallFile)
                'Then download it
                DownloadFile(NetPath + InstallFile, InstallFilesPath +
InstallFile)
            Else ' If the source file can't be found, Download new copy
                DownloadFile(NetPath + InstallFile, InstallFilesPath +
InstallFile)
            End If
        Else 'Directory did not exist, so create it and copy new file over
            Directory.CreateDirectory(InstallFilesPath)
            DownloadFile(NetPath + InstallFile, InstallFilesPath + InstallFile)
        End If
    End Sub

    Private Sub LaunchApp()
        'This sub launches the actual Program
        System.Diagnostics.Process.Start(AppPath + AppName)
    End Sub


The trouble is that it wants to run the LaunchApp() sub immediatley
after calling the LaunchUpdateInstaller() sub.
I was thinking of putting in a timer of some sort, but I was wondering
if there is some quicker/better way of doing this.

MTIA,
David McAfee
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