VS 2008 - Getting Error When Importing Class To Form
Jul 16, 2010
When I import a class to a form and use it I get this error:
An error occurred creating the form. Additional information is found in Exception.InnerException. Error: The document refers to itself of the default instance created during the formation of infinite recursion. Set a reference to the form constructor using the form attribute of Me.
The code is...
Imports TCP.SystemBuild
Public Class MainForm
Dim SystemBuild As New SystemBuild
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Aug 13, 2009
I'm trying to program in a true object oriented manner and its causing me to re-learn a few things. Specifically, I'm having some trouble with error handling. I have all of my data access being performed by an adapter class in a seperate project. I can catch duplicate records without any problems, but I want to be able to send a message back to the user. Here's what I have so far:
[Code]...
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Dec 11, 2011
Ok, I've been fighting this for days and so far haven't found very much helpful information on the web. Apparently this isn't a very popular thing to do since there isn't much out there. I'm hoping someone here can help me out. I don't know very much about dll's or implementing classes in vb, so please correct me if my thinking is wrong.If it's relavent I'm using Visual Studio 2010.I'm working on a much larger project, so I've created a greatly simplified version to test and and ask questions about.Here's the situation:I've created a class in c++ that I now need to create an interface for in vb. As I said before I've created a much simpler class and compiled it as a dll. There are two functions in the dll:
[code]...
The setTestVar function simply sets the value of a member variable, and getTestVar returns the value of that variable. I load the setTestVar function from the dll like this:
[code]...
Then when I click a button, I call:setTestVar(9) This results in an "AccessViolationException was unhandled" error. "Attempted to read or write protected memory...."After thinking about it, I guess this would make sense if the constructor in the dll was never called (and thus the variable into which I'm trying to store data doesn't exist).So the question becomes, how do I call the constructor in the dll from vb such that I have some sort of handle or reference to that object when the call returns from the dll? Without a handle, I won't be able to access any of the member variables. Is this thinking close to being correct? Or is the problem something entirely different?So again, how do I call the constructor in the dll (from vb) and somehow have access (from vb) to the object that it creates?
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Mar 24, 2010
I am working on a Java project and I am having some difficulties with importing a .class file. Unfortunately I do not have access to the source code of the file?
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Jul 4, 2011
the problem i met is that i have iis 7 running on my pc.in the root file, wwwroot, i have a website folder, namely [apex] which is a virtual directory. in the folder is a bin folder containing a compiled class with namespace.then in an aspx file, i tried to import the namespace and use the class inside the namespace.
[code]...
the namespace and classname has been checked well, no mistake. but at compiling stage, i got "type is not defined " message. ok,then, in iis 7 control panel, i convert the whole website folder from "virtual directory" to "application" type. the problem goes away!
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Oct 27, 2011
We have a typelib where we define some constants. One of our sets of constants is created using the module keyword:
module MyConstants
{
const int Const1 = 1;
};
I use tlbimp.exe in a bat file to generate a primary interop assembly for internal use.If I create a VB .net project and add a reference and browse to the .tlb file and import it, the result I see in the browser window is a class named MyConstants. If I click the class, the right hand pane is empty - the class contains absolutely nothing.
If I add a reference to the primary interop assembly, I also see the class MyConstants int he browser window. When I click the class, the constants show up.This is in Visual Studio 2010 (RTM). Why does VB .NET add reference via brwose to the .tlb file differ in this case? Is this a bug in VB .NET or the tlbimp.exe tool?
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Nov 16, 2011
Here is what I have in my file
Option Strict On
Imports MyNameSpace.MyEnum
Public Class AwesomeClass
[Code].....
But since MyEnum isn't defined in the subclass it won't work. I am not very familiar with what these types of things are called, but I think that I am import a type definition of sorts. Since I am Importing, and not defining, it is only available in the first file. Basically, I want to include MyEnum as part of the class but I don't how to do it. I don't want to copy/paste it over, and I don't really want to write Imports ... at the top of all of my subclasses.
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Nov 5, 2010
I am having trouble importing mySQL to my project. When I use the syntax Imports MySql.Data.MySqlClient a warning shows up saying that "namespace or type specified in the (code) doesn' contain any public member or cannot be found"
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Apr 5, 2009
I created a new form in VB2008. I added a COM componet to the toolbox, "Shockwave Flash Object", and before I even begin the coding, I simply just try to run the form with the Shockwave Flash Object on my form. I seem to get this error?
An error occurred creating the form. See Exception.InnerException for details. The error is: Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).
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Aug 19, 2011
When the connections is successful (which it does when ran). Button 1 Writes to the text file (which it does successfully). Button 2 deletes the contents of the table and not the table itself (which it does successfully). Last, button 3 is supposed to read the text file and insert each field which is separated by a comma back into the existing table. However, at the "addComm.ExecuteNonQuery()" step I receive an error (An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in system.data.dll). I have spent many hours trying to find a solution but can't seem to get it to rewrite the text file back to the table.[code]...
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Jun 6, 2010
I have a VB.NET Console Application that depends on a C++ project in the same solution. I'm importing the C++ dll for use in the VB project. When I compile and then run the application, I get the runtime error R6034. Anything wrong going here?
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Apr 22, 2010
I have 2 projects. The first project has a form called Form1 in it and I want to import this form into Project 2 and have it fully working without any problems.
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Aug 25, 2011
i have added a winsock control to my program. I know that vb 2008 dosent really support winsock no more but its needed for my project.Anyways i have form1 with a button that does "form2.show"This works as it should and opens form2 but when i add a winsock control to form2 then i get this error when i click the button to show form2
"An error occurred creating the form. See Exception.InnerException for details. The error is: Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))"
I dont get it, there are no classes apart from the form class.
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Apr 15, 2010
I have put this code in the global form Inherits System.Windows.Forms.Form. And then in the form that will inherit this from the global Inherits MenuStrip. "MenuStrip" is what the global form is called. But keep getting this error: Error1Base class 'MenuStrip' specified for class 'Lesson2' cannot be different from the base class 'System.Windows.Forms.Form' of one of its other partial types.
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Sep 7, 2010
importing form contents (controls) to ms word in vb.net???
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May 27, 2010
Why do i keep getting "Keyword not valid as indentifier" error in Declare statemens even after importing system.runtime.interop?
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Feb 15, 2012
The issue I have is being able to import a batch file (text file) into a vb form. I have test data for a system in this text file that needs importing into a textbox on a form. I have a button named importbutton that when pressed, will import this file into the text area, that contains over 30 rows worth of data. (Data being single sentences related to IT issues).
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Nov 17, 2009
does any one know if this is possible and if so , how? importing a excel graph and viewing it on a vb form? sample code would be very nice
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Jun 12, 2007
i am putting this article in the right section. Actually i need a way to import all the controls i have in my html file on the vb.net application windows form.Basically i want a way to have a replica of my html page on to the vb.net windows form.in finding a way to read the content of the html file as we read the content of the xml file in vb.net.
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Mar 9, 2010
I have an array of pictureboxes in my form and i want to use the picture boxes in a class. I know you have to use a constructor for this but i'm not sure how to code it exactly. I have tried many things but it just does'nt want to work..here is the code of my array in the form and the constructor
Dim Deler As dealer Protected cardPlace_array() As PictureBox = {picDKaart1, picDKaart2, picDKaart3, picDKaart4, picDKaart5, picDKaart6, picDKaart7, _ picUKaart1, picUKaart2, picUKaart3, picUKaart4, picUKaart5, picDKaart6, picUKaart7}
[Code]...
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Nov 26, 2010
I'm upgrading a project from VB6 to VB2008.I have a routine that clears a combo box, named 'cmbDataTable' which could be on any form. I pass the form and the combo box is cleared.
[code]...
I assumed it would be the same in VB2008 but I get the error.'cmbDataTable' is not a menber of 'System.Windows.Forms.Form'I am working my way through the project, first updating the global procedures - this is one - I haven't written the calls so cmbDataTable doesn't yet exist.
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Apr 9, 2010
I am trying to import a CSV file to SQL Server 2005. The CSV file has several fields, but I am not sure of the best way to import them. This is what I have so far.
[Code]...
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Dec 14, 2011
As of the moment I have 24 buttons that are keys to a piano.24 of the button codes have a call method that calls the note to be played.24 of the private subs that are called have an .wav audio playback command within them. I was hoping I could move the .wav private subs into a separate class, and just call them from my main form, therefore cleaning up the lines of code I have at the moment. [code]That example only counts for one Button "The Key of C", and the audio file that is called with it. Multiply that by 24 and you get a big mess of repetitive junk.Can I move the audio subs into a class and call them from my main form?
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Apr 1, 2010
I need some help to understand my options to get this working. I try to update a textbox control by a property-changed event from a class variable. I've digged around for a day and have a vague understanding that this can be solved in three ways:
1. Using some "if InvokeRequired", "Invoke" code in the handler method
2. By programming a special delegate class for this variable
3. By using a databinding directly linking the control (textbox) to the class event
Now.. Are these options correct? And would it be possible to get some help to show these three solutions in actual code (relevant to mine)? I can't seem to manage to sort all the information to a working code. Also, what are the pros and cons of the different solutions?
As my code stands now, it's obviously none of the above, as it gives a cross-thread error, as indicated.
[Code]...
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Jun 8, 2011
"How to import or put Microsoft 3d Movie maker in VB 2008?"
I have searched in internet but got none.. I also tried to but I don't get it.
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May 21, 2010
I have this script that reads the accelerometer on my m200 tablet pc but I don't know how to use it in a windows form, how to import or declare it it would be nice.
The .cs script is
using System;
using System.Runtime.InteropServices;
class Accel
[Code].....
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Dec 8, 2009
I have a form that creates an instance of a New Class. The code is simple so there is no issues with the programming.
I can step through the code on the Main Form without issues. Stepping Into moves from 1 line to the next.
I can't seem to debug the code within the class though. I set breakpoints but "stepping into" doesn't work. The code gets executed, but it doesn't step through each instruction.
I've tried changing many of the options within Tools > Debug with no luck.
I've tried deleting files from bindebug and obdebug.
Not being able to debug my programs.
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Dec 16, 2010
I've been coding a Windows applicaton for the past seven months but there aren't a lot of "windows" in the application so I have a question on getting and returning data from forms. I display a form and the user makes a listbox selection then presses Ok. Normally I can proceed from there (in a class module) with values from the config file, but sometimes his selection will require me to ask for more information. So I want the class to display a form, pass control to it, then when the user hits OK on this form, return to the class. What is happening is the class continues with all its inline code and function calls and doesn't show the form until the end of its current function.
Dim flClientInputFile As New CFile
Dim flPreparedOutputFile As New CFile
Dim lRecordCount As Long
Dim sProcessing As String
Dim sTest As String
Dim frmAbc As New frmAbc
frmAbc.Show()
frmAbc.Activate()
x()
When I run and step through this code, I find I'm in x() before I even saw the form. x() needs the data the user has entered on frmAbc in order to continue.
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May 16, 2011
What i want to do is when button1 is clicked it disables tmr1 on the main form, and then opens up an instance of a new form, when that instance form is closed, the tmr1 on the main form is enabled again....how do i enable the timer control when the instance is closed?
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Aug 7, 2009
I have inherited a VB.net web app that I'm making some changes on. I'm perfectly capable with the programming side (VB and MSSQL) but I'm getting lost with the tools. I was given a zip file of the code and everything. I opened the sln file in Visual Studio 2005 and it worked fairly easily with little modification.
Running the app works perfectly. Problem is, I need to write some new SPs so need the database admin. SQL Server 2008 Express is installed but it doesn't see any database and I have no idea how to import it.I have a folder App_Data in the project with the file ASPNETDB.MDF. Opening this in VS gived the error: This server version is not supported. You must have Microsoft SQL Server 2005 Beta 2 or later.
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