Handle The Errors Inside .dll Files When Creating Them In .Net?
Jan 9, 2012
I know this idea of - if message boxes are used to display error messages inside a .dll and when the .dll is installed in a different computer (possibly a server machine), errors occurring inside that .dll will be shown in the server and not to the user. Since practically there will not be a person near the server to click 'OK' to the error message every time it occurs it will stuck the programs using the .dll.
So how to write exception handling to a .dll project?
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Apr 30, 2012
I am making an invoicing application. I have a label (lblCost) inside of a UserControl (InvoiceEntry) inside of a FlowLayoutPanel (pnlEntries). InvoiceEntry represents a line item on the invoice, and pnlEntries is the "body" of the invoice. pnlEntries can hold several InvoiceEntry controls.
I am attempting to sum all of the lblCost values from each InvoiceEntry control to make a subtotal, and I want that subtotal to change automatically if costs are changed (e.g., a change in quantities being ordered). Is there a way to handle when the lblCost.Text property of any of the InvoiceEntry controls contained within pnlEntries changes?
InvoiceAdd.vb:
' Instantiate objects of the various database interaction classes.
Private mCustomer As New Customers
Private mItem As New Items
[code]....
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Mar 10, 2010
I am making a vb.net program that calls several other subprograms. None of them effect the other.If there is an error in 1 of them, how do you record the error but continue on to the next subprogram with out stopping everything ?
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Mar 12, 2011
how can I make an app that knows when it crashed and why.I had some thinking, and came up with the idea that I'll have a separate process, working in parallel with my app, and looking after it, and know when and why it had crashed.Can I make my app know when an imminent crash is coming and dump unsaved user data, not to be lost?Let's say that I have an app, that need's "GoRun.dll" to work, but it isn't there, so my app will crash, but can I make my app run long enough to download the "GoRun.dll" file from [URL]?(or have a parallel process to do it, started by the original process, that downloads the "GoRun.dll" file and restart my original app)
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Oct 4, 2009
is it possible to add some VB.net code to handle all the errors in my application. (and not to go in each sub and add the on error intruction) I want to handle every error.
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Jan 9, 2012
I am using Visual C# 2010 Express and Visual Basic 2010 Express on my Windows 8 developer preview PC.Before, there was no problem, both VB and C# work fine.But today, both VB and C# can't handle errors. I have created a simple application with VB and C#. (.Net framework 4.0) the codes are here:[code]But visual studio shows the dialog shown in first image instead of this dialog. So, I can't debug my program.If I enable break exception when thrown in Exceptions dialog, the problem solves, but at that point, visual studio breaks on EVERY exception , even handled exceptions... I don't want to break on every exception...
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Mar 10, 2011
how do I handle the errors that may appear from the user of my program. For example, I have an triangle area program in wich I ask the user of the program to insert the length of the base and height of the triangle in a textbox. But what if he inserts a letter or something else, like a sign....my program will crash...
I know that one method would be to use On Error GoTo but I don't know how. If maybe you can direct me to some link or you could explain how do I handle errors, I would be grateful. Maybe you can even show me other ways to avoid errors from the user input.
This is my small program so far:
Private Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Handles Button1.Click
Dim , Height, ARIA As Integer
[Code]....
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Dec 6, 2010
I'm trying to read rows in a DataGridView and the following error is thrown up. The DataGridView was filled from an Excel Sheet with a column of currency. Ideally when the For Next loop finds a cell it doesn't like, I want to to ignore and resume the loop. The error message is: Object reference not set to an instance of an object
HTML
Try
For Each row As DataGridViewRow In Me.DataGridView2.Rows
FirstString = row.Cells(0).Value.ToString
[CODE]...
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Aug 8, 2010
I'm familiar with Throw New Exception(), and how this causes an application to "break" with an error at the Throw line itself.But what I'm after is a way to throw the exception within a function, and for the application to break at the line which called the function - not at the Throw statement itself.Is there a way of doing this, but without having to wrap the function call within a Try-Catch?
For example:
1. Main code calls function "DoThis()"
2. DoThis() runs and throws an exception
3. Code breaks at "Call DoThis()"
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Jul 17, 2009
i have an old VB6 system that generates plain text files. When this old system writes "A" into the file, it writes (hex) "41". For an "ä" (a-umlaut, special gernam character), it writes (hex) "E4".
Now i have to process files like this in VB.Net. when i open such a file in the IDE, it displays correctly "ä" (But not always!). To see what i mean, please open a notepad and create a new file "ae.txt" with content: äöü. Now your file contains exactly 3 bytes: (hex) E4 F6 FC.
But when i write code like
Dim strTest As String
strTest = File.ReadAllText("ae.txt")
Debug.Print(InStr(strTest, "ä"))
i get 0 - so i cannot find back the "ä" - what do i need to do, to find it? And 2) for compatibility reasons, i have also to be able to create such files. How to do that? Seems the different encoding types do not work as i think.
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Apr 26, 2009
[code]the program keeps trying to create the folders in the runtime directory not in my documents under ipceloyn any ideas why this is not working?
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Aug 5, 2011
What is the best way to handle a function that might occasional fail to evaluate, but even when it does fail does not require a halt of the parent routine, though sometimes might require an explanation to the user?I have such a function, deep in my code, that returns a number. Codingwise, the simplest approach would be to make the function nullable, and return null when it can't evaluate. That way the calling routine can continue while also knowing the function failed to return a number.
However, depending upon the circumstances, sometimes I want to display the reason for the fail to the user so they know what to fix. Obviously just returning null isn't enough information. Should I be raising messages inside the function itself as it evaluates for anonymous listeners to catch, to be displayed if desired?(For those rightfully pointing out that logic functions shouldn't be responsible for creating user messages, I didn't mean to imply the function generates the full text message, just somehow transmits the reason for the problem so that the UI could later parse that into a message)
The other option I suppose would be throw exceptions inside the function if it can't evaluate, then catch and interpret to user messages if desired. However, as stated the inability to evaluate typically does not signify a halt to the routine, and now I'd have to put a Try...Catch block around the function call everytime I use it.
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Apr 13, 2011
I cretaed a vb application where I concatenate a string to build XML code and Im getting an error stating that I must include a matching PURCHASE-ORDER-SHIP-TO end tag which clearly exists see below:
sMyXml = sMyXml + " <PURCHASE-ORDER-SHIP-TO>" sMyXml = sMyXml + " <DIRECT-QUESTIONS-TO>ATHOS PETROU</DIRECT-QUESTIONS-TO>" sMyXml = sMyXml + " <address:ADDRESS xmlns:address=""http://www.removed"">" sMyXml = sMyXml + " <address:NAME-LINE-1>Addr1</address:NAME-LINE-1>" sMyXml = sMyXml + " <address:NAME-LINE-2></address:NAME-LINE-2>"
[Code]...
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Nov 20, 2010
I have a small program that contains a webbrowser object, 2 labels, and 3 listboxes. For some reason, whenever I try to hit Debug, it gives me the following error:
System.InvalidOperationException was unhandled
Message=An error occurred creating the form. See Exception.InnerException for details. The error is: Object reference not set to an instance of an object.
Source=Test3
[Code]...
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Jun 20, 2010
which are the control used to display word files and excel sheets inside vb.net forms ? (i have already added reference lib.)
Platform: Vb.net (framework : 3.5)
language : visual basic
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Sep 21, 2009
I'm creating that sets up project directories based on a template and also allows users to select folders from the template to add to a selected path (their project dir). I've got everything figured out as to creating the directory initially except for 1 thing that ties into another (stick with me here). I'd like to create the directories based on a text file or some sort of config file. Essentially, I would have a text file that contains lines like:
oot
ootsub1
ootsub2
[code]....
etc. Then when I create the directories, I can create them based on these lines. I think I can figure that part out myself. Where I'm stuck is on comparing the selected dir to the template dir. Right now I have a treeview control with checkboxes that is populated based on a path that the user selects from the folderbrowserdialog. What I need to do is compare the selected directory with the directories in the text file and if the directories exist (match) then they are checked. If they don't exist in the selected directory then they are unchecked.
If a user wants to add a directory from the template, they check the box for the dir they want and uncheck the boxes for the ones they dont. Then hit apply and the app will either create or delete the checked/unchecked dirs. What's the best way to handle the template dir? Should I do the text file thing or should I simply have the directory structure setup somewhere where the app can copy the dirs from the template to the selected directory? Or should I use an ini file? I want to make the app flexible so that down the road, if they change the template layout, or where the template lives, the app can be told that. So I need to add a way for the users for example to choose the template directory (but not everytime!) or specify the path that the template dir txt file lives.
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Jun 19, 2009
I want to create a .txt and then run a batch file which runs a .pyc which uses this file as a parameter. When I do this, I get a message that says the python program was unable to access the file. However, if I break after creating the .txt, then manually open, save, and close it (note: open close only doesn't work), and then continue running my code, it works fine. I think that my program still has control of the text file when the python program tries to access it, however I don't know how to release control.
'array input is system.arraylist of all words that I want to have in the grammar
Dim fso As FileSystemObject
fso = CType(CreateObject("Scripting.FileSystemObject"), FileSystemObject)
[Code]....
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Apr 30, 2011
I've been trying to find a Windows API function I can use to generate a virtual file handle in Windows. I'm working with VPC/xVM and I want to create a virtual machine that actually points to my physical hard drive - the methods provided with VPC and xVM for this really suck (I've never been able to get it to work with either virtualization product).
[Code]...
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May 21, 2010
There are three forms on this application and they are a MDI Frame(frmMain) and two child forms (frmSearchEmp, frmEmpDetail).
What I am trying to do is opening a "frmEmpDetail" by executing "CallEmpDetail()" on "frmSearchEmp".[code]....
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Aug 23, 2009
In vb.net and made a proj. in vb2005. but when i try to load a particular form(opens up in a mdi container like all others in the project) , an error-error creating windows handle pops up, the line is frmadmn(the form).show
What shall i do? i read a lil on the net about too many handles, user objects etc. but the stats of my proj. at the time of error are-handles-350,threads-17,user objects-235 gdi objects - 159. have these anything to do with the prob.. then what should i do..? i read about the dispose command also about how to use it ? what to dispose...?
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Aug 27, 2010
I get this error as below when I open my "frmAddPrivate" more than 5 times. How I can overcome it?
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Sep 14, 2011
I've a little program that has got tabControl with 2 tabs - "results" and "log". My idea was that when an error occurs the tab will switch automatically on tbLog to show what the problem was. Most arguably the problem is in threading. This is the code that..I use:
Dim thread As New Thread(AddressOf ExecuteQuery)
thread.Start()
ExecuteQuery executes the query and I'm making an error deliberately to see if I'll be automatically switched to the log tab which is in Try-EndTry procedure:
tbGrid.SelectedTab = tbGrid.TabPages(1)
The program indeed switches to tabLog (which is number 1) but I don't see any controls on it (txtLog), then when I'm trying to switch tabs a couple of times I get "Error creating window handle in a thread". I read other forum threads about it where people as how many controls do they have in their programs but my program does not exceed 70 controls on a form.
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Sep 3, 2009
I am using a Thread object to perform a function. This function performs a task and displays its progress in the gridview (like adding rows changing text etc )
The reason I am using a thread for this function is that there is a cancel button on the form. While the task is in progress, user can click on cancel to abort it.
Private Sub BtnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnStart.Click m_Thread = New System.Threading.Thread(AddressOf myfunction) m_Thread.Start() End Sub
The function works fine and thread is completed. But calling any method of datagridview after thread is completed ( outside the worker thread ) generates an error- "Error creating window handle".
That's probably because i am not using the invoke method of datagridview for calling its methods or readingwriting properties Do i have to create separate delegates for all the methods properties used in the function ( worker thread)
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Apr 27, 2012
I'm using MS Visual Basic 2010 Express. The project requires me to refer to a class in another file, which is all well and fine, but it tells me that "Length" is not a member of the file class "Rectangle", when it plainly is. And it's only "Length" and "GetArea", not any of the other variables I refer to. I would've tried to look it up, if I even knew what I was looking for, but this problem has stumped me! I'll add the snippet of code that I'm trying to refer to the "Length" and "GetArea" with, as well as the parts of code that those two are in the "Rectangle" file.
'displays cost of sod
Dim floor As New Rectangle
Dim dblPriceSqYd As Double
[code]....
As you can see, it's obviously there. The code for the "Width" is exactly the same as the "Length" with a few name changes. My problem here is: I can't figure out why it's having trouble calling those two, when it calls the "Width" just fine. I've tried changing around the names, and nothing seems to work.
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Apr 16, 2009
This does not work because it will not write when the writers closed how do I keep it open? What do I have to change?
Dim tring As Integer
Dim startnumber1 As Integer
Dim bas As New System.IO.StreamWriter(SandboxLocation.Text & "internetconectivity.bat")
bas.InitializeLifetimeService()
[Code] .....
If tring is more than one it doesn't work, it cant write to a closed bat file.
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Mar 2, 2009
I've taken a few vb courses a few years ago but I've been wanting to write a script that will search my harddrive(C:) for any ".dda" extention and list the location to a listbox. I eventually want the script to also copy the file to the location of the build but I can't seem to get the first part working at all. [code]A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll.
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Jul 25, 2011
Possible Duplicate: Can .NET intercept and change css files?
I have configured IIS6 to get .NET to handle css files.I did the following steps
Launch IIS Manager Right-click on Default Web Site Click on the Home Directory tab Under Application Settings click on Configuration.Add a new association for .css and map it to .NET executable:
C:WINDOWSMicrosoft.NETFrameworkv2.0.50727aspnet_isapi.dll
How can I check if this is working, i.e. I want to change the default style of a page depending on the url, i.e. if the referer url is http://intranet, it should continue to use the old existing style style1.css, if the referer url is http://intranetv2, it should use the new style style2.css.
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Feb 25, 2009
how to make VB handle my associated files.I made a program that opens fine when from the EXE file. But however, when I try to open it from the associated file, it behaves the same way as if opened from the EXE.So, where (in what method?) do I tell VB how to handle those files?
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May 22, 2012
Ok I know this question has been asked to death but I still have not seen a good answer. I have created an application in VS2010 using VB.NET. In my application I have an error log that is an XML file located in the Public gstLocalErrorLogLocation As String = Application.StartupPath & "ErrorLog"that gets written to in the event of an error so I can trouble shoot application easier. My application also downloads files from our FTP site and puts the files in Public gstLocalDownloadLocation As String = Application.StartupPath & "download"So I have files that get read and written to as well and created and deleted all in the Application.StartupPath which is either "c:Program Files(Application Directory)(Some Directory)(Some File)" or "c:Program Files (x86)(Application Directory)(Some Directory)(Some File)" depending on 32bit or 64bit Windows 7.
After creating the setup I install it on my test machine that have both Windows 7 32bit and 64bit.Everything in the application works great till I have to write to, delete or creat a file in those directories above. I know it is an access issue and the UAC. This will get installed on numerous systems so the options I have seen to change file or folder permission on the computers manually is not an option.What has to happen is after I install the application it just works like when you install it on XP. Some post have suggested that you us a user with administrator privilages or group which is all fine and dandy but the user I have used to test the application has all of that.
So what I am asking is how do you create an application with VS2010 in VB.NET that after creating a setup package and installing on Windows 7 will just work with out "Access to the path c:Program Files(Application Directory)(Some Directory)(Some File) is denied." If I have to install this on 100 Windows 7 computers it has to be a concreate no manually doing anything just install and work like when we installed on XP.
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Jul 14, 2012
I'm in the process of converting a VB6.0 application to VB.Net (2008 Express). I have a MDI parent form, I'll call mdiBackground, and 4 MDI child forms, frmStatus, frmShow, frmQwerty, and frmSentence.The layout is as follows:mdibackground - has the menus at top and is a container for the child forms.frmSentence - appears at the top frmShow & frmQwerty - appear at the left and when one is closed the other one is in the same position.frmStatus - appears at the right, it has buttons which control when frmShow and frmQwerty are to appear I have a couple of regular forms that act as dialog forms. The Me.Close() works fine on these.
[Code]...
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