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 Post subject: Application - Error handler
PostPosted: Sat Nov 26, 2011 9:53 am 
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Joined: Sat May 27, 2006 3:27 pm
Posts: 480
I wanted to share a simple code to use in your application to track down errors.

Mine looks like this when it logs it to a file

Code is below hope this helps

UnhandledException: NilObjectException

Current date: 2011-11-26 09:37:44

Executable Name: My Application
Executable Path: C:\Documents and Settings\Owner\Desktop\****\Error Logs\Log - 2011-11-26 093744.txt

Executable Size: 4.77 MB
Executable ModificationDate: 2011-11-26 09:37:37
Executable CreationDate: 2011-11-26 09:33:00

UserName: ***
Computer Name: ***
OS Version: Windows XP Build 2600 Service Pack 2

Call Stack:

% main

1. Put this code in a buttons action event to make the app have a error

dim f as folderitem = nil = "hello"

2. Put this code in the apps Unhandled exception

Dim d As New Date
Dim f As New FolderItem
Dim CurrentDate As String = ReplaceAll( d.SQLDateTime , ":" , "" )

f = SpecialFolder.CurrentWorkingDirectory.Child( "Error Logs" )

If Not f.Exists Then

f = SpecialFolder.CurrentWorkingDirectory.Child( "Error Logs" ).Child( "Log - " + CurrentDate + ".txt" )

Dim t As TextOutputStream = f.CreateTextFile

If t = NIL Then Return False

t.WriteLine "UnhandledException: " + Introspection.GetType(error).Name + EndOfLine
t.WriteLine "Current date: " + d.SQLDateTime + EndOfLine + EndOfLine
't.WriteLine "Executable Name: " + App.DisplayName
t.WriteLine "Executable Path: " + f.AbsolutePath + EndOfLine
't.WriteLine "Executable Size: " + BytesToString( App.ExecutableFile.Length )
t.WriteLine "Executable ModificationDate: " + App.ExecutableFile.ModificationDate.SQLDateTime
t.WriteLine "Executable CreationDate: " + App.ExecutableFile.CreationDate.SQLDateTime + EndOfLine
't.WriteLine "UserName: " + GetLoggedInUserName
't.WriteLine "Computer Name: " + GetComputerName
't.WriteLine "OS Version: " + OSVersionString
't.WriteLine "ProcessorCount:" + Str( NumberOfProcessors ) + EndOfLine
t.WriteLine "Call Stack: " + EndOfLine
t.WriteLine "Stack: " + EndOfLine + Join( error.Stack, EndOfLine)

MsgBox "An error occured "+ Introspection.GetType(error).Name + EndOfLine + EndOfLine + "A error log has been saved under " + EndOfLine + f.AbsolutePath + EndOfLine + EndOfLine +"App will be closed."



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 Post subject: Re: Application - Error handler
PostPosted: Sat Nov 26, 2011 1:05 pm 
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Joined: Fri Nov 10, 2006 4:10 pm
Posts: 1855
Location: Michigan, USA
Excellent, thanks for the contribution! :)

Is there a reason you commented out some of the WriteLines in your code?

Windows 8 x64
Windows XP Pro SP3
Ubuntu 11.04 via Virtual Box
RS Enterprise 2012r1.1

Programming Tutorials & Free Projects:
"Christianity has not been tried and found wanting; it has been found difficult and not tried." - G.K. Chesterton

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 Post subject: Re: Application - Error handler
PostPosted: Sun Nov 27, 2011 1:39 pm 

Joined: Tue Sep 19, 2006 5:10 pm
Posts: 179
I have been tracking a problem that has stopped me from using newer versions of RealStudio since 2009r5.1. This is in bug report 14990 - "Reading Recordset field fails after reading another field succesfully. No errors reported. Application quits" currently ranked 192. I am currently using 2011r3 - OSX 10.6.8.

I never thought of implementing such a strategy in the UnhandledException EventHandler in App. Being a bit excited now I could see where I could grab some data from the crash using this technique. However my excitement was quickly dashed when I ran the app, it crashed and no file was created. I added a stop in the debugger upon entering UnhandledException and that stop was never reached.

Bummer. I need a fix for this crash so I can move all my apps into the newer releases. I just sent in the latest crash in hopes RS can solve this problem very soon.

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