BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Throwing exceptions in wizards: good or bad?          BorlandTalk.com Forum Index -> Delphi OpenToolsAPI View previous topic :: View next topic   Author Message Andrea Raimondi Guest Posted: Sun Feb 11, 2007 5:52 pm    Post subject: Throwing exceptions in wizards: good or bad? Hello. I have the need to abort a wizard if a project isn't selected. My first attempt was to use MessageDlg but I receive an exception when I try to use it. This is my code: procedure TReadMeWizard.Execute; begin if Not Assigned( FCurrentProject ) then begin MessageDlg( 'Can not start wizard. No project assigned.',mtError,[mbOk],0 ); end; // Stuff here end; Now I was thinking that throwing an exception may be a good solution, but then I have to use MessageDlg in other points too and I can't throw exceptions for confirmations and other stuff like that. Maybe I should be using the output window? I would rather use a custom dialog at this point. Another option maybe is to have it enabled/disabled according to the presence/absence of a selected project, but would it work with the New dialog? I thought it would only work with menu items but who knows... Any thoughts? Andrew -- You can subscribe my blog at http://www.andrearaimondi.net/rss.php or http://www.andrearaimondi.net/atom.php Back to top Sergio Sette Guest Posted: Tue Feb 13, 2007 4:02 pm    Post subject: Re: Throwing exceptions in wizards: good or bad? Quote: Another option maybe is to have it enabled/disabled according to the presence/absence of a selected project, but would it work with the New dialog? I thought it would only work with menu items but who knows... Are you using D2006 ? In D2006 your wizard can implement the IOTAFormWizard100 interface. (take a look at the IsVisible function) Ciao sergio sette Back to top Erik Berry Guest Posted: Thu Feb 15, 2007 4:37 pm    Post subject: Re: Throwing exceptions in wizards: good or bad? Andrea Raimondi wrote: Quote: I have the need to abort a wizard if a project isn't selected. My first attempt was to use MessageDlg but I receive an exception when I try to use it. This sounds like a bug in the IDE. I'd put a simple test case in QC, and maybe someone can them duplicate and promote it into the CodeGear internal bug tracking system. 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