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.NET Forum / Languages / C# / June 2007Missing .NET and Exceptions
Hi All, I've been reading about Application.ThreadException, Application.SetUnhandledExceptionMode & AppDomain,CurrentDomain.UnhandledException. I'm trying to determine if there is a mechanism where if the .NET framework is missing, is there any way at all to gracefully catch it in my code and inform the user of what's wrong. Is this even possible? If so, how can I catch it and nicely inform the user of the problem - Microsoft's "The application failed to initialize properly..." message is basically useless to a user. If it's even possible & anyone has any code to share, I'd be much appreciative. TIA,  SignatureJohn C. Bowman Software Engineer II Thermo Fisher Scientific <Remove this before reply> john.bowman@thermofisher.com WORLDWIDE CONFIDENTIALITY NOTE: Dissemination, distribution or copying of this e-mail or the information herein by anyone other than the intended recipient, or an employee or agent of a system responsible for delivering the message to the intended recipient, is prohibited. If you are not the intended recipient, please inform the sender and delete all copies. Hi, Not, unfortunatelly all those events, classes, etc that you mention, well they are part of the framework in tehr first place :) You would have to create an unmanaged process to detect the presence of the framework. Or convince MS to create another message :D > Hi All, > [quoted text clipped - 9 lines] > > TIA, John, It's impossible, since the code you would write is managed code, and without the framework installed, managed code won't run. You would have to create an unmanaged stub to check for the existence of the framework, and then show the appropriate message if it is not installed. If it is, then you would just create a new process and run your managed executable then. Signature- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com > Hi All, > [quoted text clipped - 9 lines] > > TIA, Ignacio & Nicholas, Thanks for the info. That's what I suspected. Unfortunately, the case in question is a setup/installation like process that already has a stub written in C++ that does exactly that, once the framework is installed, then the stub runs the main C# .exe program. Unfortunately, there's no way to prevent the user from trying to run the main .exe program directly w/o the stub 1st. If the user does this, then they crash and have no idea why because the message is "engineerese". What's really needed is the loader's crash message to be more usfully informative to the average non-engineer user, or the ability to substitute your own graceful message into the loader in the event the proper .NET framework is not present. John > John, > [quoted text clipped - 19 lines] >> >> TIA, Hi, > Ignacio & Nicholas, > [quoted text clipped - 8 lines] > user, or the ability to substitute your own graceful message into the > loader in the event the proper .NET framework is not present. What if you rename your managed EXE to some other extension , like _EX. in this way t will not be executed. As a step in your install process you can rename it back to the correct extension. Ignacio, Thanks for the idea, but that won't work either because it's distributed on a CD/DVD - so renaming it as part of hte install process is not an option. However, this does give me an idea I hadn'tr considered before. I wonder if the CreateProcess Win32 API method which is used in the stub to launch the .NET .EXE can handle something that's not named .EXE? I've never tried/thhought of that. If so, then I could rename the .NET .EXE and the user could never double click it & try to run it directly. But the stub could then successfully launch it. I'll have to look into this possibility. A quick look at the MSDN for CreateProcess doesn't really mention anything directly, but it does mention the possibility of not having a file extension. Thanks! John > Hi, > [quoted text clipped - 16 lines] > As a step in your install process you can rename it back to the correct > extension. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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