Researching A .dll File For Potential Cause Of Exception?
Oct 26, 2011
I've been having difficulties with a Win32Exception related to the Drawing.dll. After many man-hours of research and a couple creative attempts to work around it, I'm left with the likelihood that the cause of my angst rests with a .dll file provided by the vendor of the database against which I'm querying and through which I'm attempting to post updates. The vendor stated that the .dll wasn't designed with VB 2008 in mind. Though the .dll still posts the data, it's possible that something in its function is causing hiccups with the redrawing of my form and its associated treeview.
I am thinking about ways to protect software and after spending a few days researching different ways such as using instalShield, etc. i was wondering how would you go about creating your own license server.
Would it be having a part of your install procedure writing a registry file to state if it was first time used. Then from there on first load having the user enter in the information such as (Name, Organization and serial number), then the software connect to the website or server hosting the database and then have the serial number and details checked against it if not in add to the database with the MAC Address and other unique code form system ('Unsure what') and then return true which would then allow to open the software, if already present check how many times it is present through RowCount if more than say 3 to allow change of systems or upgrades then return false and return msg and stop the system.
Is this the basic princaple of it and how difficult would it be to create? is it just like preforming an SQL query against a database or would there be alot more as part of it?what could be the possible loop holes it? would it also be benificial to check the details are correct silently say every 30days to ensure that it is not copied software?
I need to do this in the MDI: Generate Form1 to maximize the potential in MDI. And mdi form to generate second Form2 order has always been above Form1. When clicking on the form 1 form2 disappear under it. Normally, when you click on the form1 Form2 hides under it. All must appear in the MDI.
I am developing an application that runs on a network. It needs to contact to database (access database) very very often, which is stored in server. Around 30 Client computers contact the database almost every 2-3 seconds. I need to know could there be potential manifest problem in with the application? Could there will be a problem if database is being updated by one client, at the same time other client contacts it?
Until now, I have not create any massive applications using ASP.Net. However, I am looking to create an application that has the potential to be very performance intensive. So I am looking for some tools or best practices when it comes to performance. I would like to be able to know how to:
See my current performance (good or bad) View items that need fixing And being able to compare two performance variable items would be great as well.
I have that code running into a windows service and the service seem to have a memory leak, something is wrong for sure. After looking at the whole code, I think it might be inside one of these function but I cannot seem to find where it could be.
I've read that making a class sealed in C# is advisable in high-performance scenarios because it frees the compiler to make certain optimizations (e.g., inlining property getters) that it wouldn't be able to make otherwise. Is the same true for NotInheritable in VB.NET?
I have a class with a static list of keys, and I have a static method called Remove() that removes a key from that list.Now what I understand from the contracts post conditions is that as the programmer of the class, I guarantee that the current public method does something specific, in this case : removing the element of the list.
Here's what I've written:
private static List<Keys> m_usedKeys; // private list of keys public static void Remove(Keys _key) {
[code]....
What I'm trying to "Ensure" here, is that the Remove() method removes the key for real from the list (Yes this might be a trivial example, but I get the error there.)when I write the Contract.Ensures() line, VS2010 gives me the following error :
Error 3 Detected expression statement evaluated for potential side-effect in contracts of method 'LibJungleTimer.KeyBind.Remove(System.Windows.Forms.Keys)'. (Did you mean to put the expression into a Requires, Ensures, or Invariant call?) C:UsersJoelDocumentsProgrammationJTJungleTimerLibJungleTimerKeyBind.cs 51
I think this error says that the expression m_usedKeys.remove(_key); has a potential side-effect. In fact, it has a side-effect, it removes a key from the list!If I try to write something like this instead :
It is possible to catch an exception and throw a new exception which wraps the first exception as an inner exception: [URL] Also, if I call a function and it throws a certain error, but I catch it, will the calling code's catch handler execute? If so, and it is of a higher exception type, is this not wrapping the exception? eg I can throw exception ex of type IndexOutOfRange, log it but rethrow, catch a higher up exception and do something, or I can throw a new exception and wrap an inner exception like:
I'm trying to get a save file dialogue to overwrite a file with the same name.
Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click If RadioButton16.Checked Then
[code]....
I keep getting an error saying "Unhandled exception has occurred in your application." Then the next paragraph says "The process cannot access the file 'E:Copy of Release+Fontsob.txt' because it is being used by another process."
I'm developing a very simple app that does nothing more than launch two other apps. I'm developing this under the .NET 2.0 framework for WinCE 5.0 in VS2005.No matter what I do, I keep getting file not found exceptions not handled, and the program crashes. (Yes I should probably have a try/catch block, but this isn't the issue.)
Now, the label change here is not important, I only do this to output the full path of the directory, and strDrivePath is "whatever.exe"
If Directory.Exists(fullPath) Then If File.Exists(fullPath & strDrivePath) Then Me.Label1.Text = "EXISTS!!!"
[code].....
The irritating thing is after getting and displaying the full path (I know it's there) I check with the first IF to prove to the program it's there. No problem.I then use the second IF to prove to the program that the executable is there, and change the label output on screen to prove to myself the code is executed. The label changes. The file is there.
Then when I run the program, File not found exception. It's driving me insane. I've tried in multiple OSes (Vista and CE 5.0), I've tried in directories with spaces and no spaces, I've tried using Process.Start() and setting up the file details through the info command.I've tried putting a path in there directly instead of using variables. I've tried wrapping the whole kit and kabodle in quotes like this Shell("" & fullPath & strDrivePath & "" ) and like this Shell("""" & fullPath & strDrivePath & """").I've searched high and low on forums around the globe, including multiple threads here and I just cannot get it to work.
I'm using FileIO.FileSystem.CopyFile to copy an Access database but get a "File in use" exception. How do you make a file not in use and after copying the file make it back in use?
for the program I am creating I want the computer to check if the configuration file has been created or not. I wrote this function to do that but I don't how to handle a file exception. Here's my code currently but obviously it returns an error if the configuration file doesn't already exist. So how do I add a check for an exception?
Public Function CheckIfRunBefore() Dim ConfDirectory As String ConfDirectory = "" Dim StreamReader As New IO.StreamReader("C:\VRAI\Conf.txt")
On an error (thrown exception), the file being processed should be moved to the folder for files with errors (app.config setting).
The problem: The only way that I can of handling this is to have a nested Try/Catch inside of the main Try/Catch to try to move the file, that way if the move fails, another exception is thrown. I know that I can do my best to make sure the directory exists, rights are given, but since it is a network drive... I just know an error is bound to happen at some point.
Example
Try (Do Some Logic, but an error happens) Catch ex As Exception Try
[Code]....
Actually that came out even more horrible than what I was thinking it would look like.
How should I really be trying to handle a possible error occuring in the catch, so that I can still move files and try to call my event?
How would I write an exception to a textfile? When the user hits OK I would like to save the exception to a textfile and display the path and file name in a second message box.[code]...
Currently to check if a file is in use (before attempting to move or send it by FTP etc) we try and open it with exclusive right and trap the System.IO.IOException that would occur if anotehr process is reading or writing the file.
However - how can we do this without the bad paractice of using an exception handler for unexceptional process flow?
I am trying to create a log file to log when an exception occurs (if it does) and what exceptions occured. I have posted the code I have so far. What I would like to do is be able to set the path I want it to go to (ie: C:VB ProjectLogs). I can run my code with the current Logging code but cannot find the file. Is there some sort of create command i need to use first?
Sub LogWrite(ByVal ex) Dim time As String Dim Path As Microsoft.VisualBasic.Logging.LogFileLocation
In VB.NET or C#, I'm trying to read the contents of a text file that is in use by another program (that's the point, actually, I can't stop the program or it stops writing to the text file, and I want to periodically read out what is currently in the text file in another program)[code]in VB the code is above (a C# answer would be fine as well), however, it still throws the IO exception "The process cannot access the file 'file.txt' because it is being used by another process." Are there any workarounds in this scenario?
During file copy, I'm giving the absolute file name. But the compiler says file not found always. Is it a problem in my system or any error in my program.
Public Sub backupDB() Try Dim FileToCopy As String
I am writing a program that creates a file and attaches it to an email. I use a loop to create the attachment, send the email and then do it again with different information in the attachment. This works well for one tim through the loop, but on the second time through I get an error when I try to open the file for output to create the new version of the file. I get an unhandled exception of "The process cannot access the file 'c:ProjectArticles1Article.txt' because it is being used by another process.". How can I release the file from being used once the email has been sent?
im making a program and it needs to load 95 files on form load.im trying to make it to if the file cant be found that it will give a error instead of a JIT debug thing. i triedadding
HTML Catch ex As Exception MsgBox("Error: " & ex.Message)
I'm trying to build a program updater based around downloading XML files from a server. The idea being that the servers XML file contains the current version number and installer location. the updater either gets dumped in the startup folder or gets installed as a service, etc. The program successfully reads and parses the current version xml file and it successfully downloads the xml file from the server.
However when I try to parse the newly downloaded file from the server I get the error: 'IOException was unhandled' 'The process cannot access the file 'C:Program Files (x86)TestServerVersion.xml' because it is being used by another process.'
The code is as follows with the error marked by a comment on line 52: Imports System.IO Imports System.Xml.XmlTextReader Imports System.Net Module Module1 [Code] .....
It's still work in progress but there's not much point in writing code to download and execute the installer if I can't work out the location of the new version. In case it's of use here is the XML: <?xml version="1.0" encoding="UTF-8"?> <VersionConfig> <AvailableVersion>2.0.0.0</AvailableVersion> <ApplicationUrl>http://192.168.2.226/EPI/2.0.0.0/</ApplicationUrl> </VersionConfig>
I have a large project where we have 2-3 dll projects that are converted from VB6 to VB.NET. We have fixed all the issues that caused compilation errors, and most of obvious issues in running, so now we have basically a program up and running. The exe is created from scratch in VB.NET, using a lot of functionality from the converted dll's (including GUI forms). What I wonder is when I run the program in debug mode, I get a bunch of warnings in the "Immediate Window" saying:
A first chance exception of type 'System.Exception' occurred in Microsoft.VisualBasic.dll
...and some of other type (but most of them in Microsoft.VisualBasic.dll).I was wondering if this is common in projects converted from VB6, or if it is caused by bad design in our code...
When I try to create a instance of a COM class it throws an exception as Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
When I try to create a instance of a COM class it throws an exception as Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))
My application has encountered a problem and needs to close.Of course Microsoft is sorry for the inconvenience, but how am i supposed to debug my app?Which dll fails to load?
The error report contains between others, system.io.fileloadexception
Somehow the User.Config file was corrupted for an instance of my VB .NET app. When access one of my user level config property (My.Settings.MyProp) I get the a ConfigurationErrorsException with the message "Configuration system failed to initialize." I looked at the User.Config file and found that it is empty, it can be opened but there is no XML text contained within.I would like to programmatically fix the file if an exception is seen. When I attempt to use any of my user level properties, I continue to get the same exception. I've tried calling the Reset() but that yeilds the same exception. I then tried Save() to see if it would write out a default version, but it appears to do nothing (the file is not updated). My.Settings appears to be useless at this point.How can I reinitialize the User.Config file to the default config settings without deleting the old file? I would think that there should be some mechanism for restoring this file back to its default. And how can I update/reinitialize the My.Settings instance so that I can access the properties normally?
