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copied!<p>I have run into a few issues upgrading our source to VFP9. Most of them rather minor, though.</p> <p>The first thing you need to do is review the What's New documentation for VFP7, VFP8 and VFP9. I know this seems like a pain, but it should be your first stop when upgrading a project. Documentation for VFP6 and up can be found on <a href="http://msdn.microsoft.com/en-us/library/ms950411.aspx" rel="nofollow">MSDN</a>.</p> <p>Many new properties and methods have been added to classes. If one of these conflicts with custom properties/methods, you'll run into errors.</p> <p>Also, you will need to become aware of <a href="http://msdn.microsoft.com/en-us/library/bb530410.aspx" rel="nofollow">Vista UAC requirements</a> and <a href="http://fox.wikis.com/wc.dll?Wiki~MeetingTheChallengesOfVistaUserAccountControl~VFP" rel="nofollow">how to deal with them</a>. Programs compiled with VFP8 or below are executed in "compatibility" mode. With VFP9 programs are compiled with a Vista Application Manifest, meaning the requestedExecutionLevel in the application manifest is set to asInvoker. VFP8 and below do not include this in the manifest (or do not include a manifest at all), hence the compatibility mode.</p> <p>This means that when running the program on Vista, several things will fail or cause errors.</p> <ol> <li>Attempting to write to HKEY_LOCAL_MACHINE in the registry will fail.</li> <li>Attempting to write a file to %programfiles% or any protected folder will generate an error. Programs should only write to <a href="http://msdn.microsoft.com/en-us/library/bb762494%28VS.85%29.aspx" rel="nofollow">common folders</a>.</li> </ol> <p>You have the option of <a href="http://blogs.msdn.com/b/calvin_hsia/archive/2007/04/13/add-a-manifest-to-control-your-application-vista-uac-behavior.aspx" rel="nofollow">updating the Application Manifest</a>, but I wouldn't necessarily recommend it, unless your program absolutely requires administrative priviledges.</p> <p>Finally, there are a number of Vista incompatibilities - <a href="http://fox.wikis.com/wc.dll?Wiki~VistaAeroIssues" rel="nofollow">some dealing specifically with Aero</a> - that were fixed with VFP9 SP2. So, if you are going to be using VFP9, be sure to use Service Pack 2.</p>

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