VS 2005 Referencing A COM Object?
Oct 5, 2009
I have a VB6 app that I'm updating to .Net. This app interfaces with PeachTree Accounting through there type library, which I have a reference. When I try to create a reference to Peachtree in .Net,
1. Select References from Myproject
2. Click "Add"
3. Select the "COM" tab
4. Select the "Peachtree Accounting 17.0 Type Library"
When I add the reference, the Path says "<The system cannot find the reference specified>".
There is something different about the way the path is listed. All the other paths are listed like "C:Program Files..." but the Peachtree library is listed like "C:PROGRA~1SagePEACHT~1PAWLegacy.dll"
This is how the old DOS use to list names longer than 8 characters. In my VB6 app the reference path is "C:Program FilesSagePeachtreePAWLegacy.dll"I tested other references with simular paths like "c:progra~1..." and they work fine. It's probably something else. I'm fairly new to .Net so can anyone point me in the right direction?
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Mar 15, 2010
Ive have a listview on my form and need to populate it with data from my Table called "tblCustomers". However I need to only retrieve records based on field that is populated with data called "Joe". In order for the SQL syntax to retrieve the name "Joe" then the SQL syntax needs to reference the Label on the form called "lblName" which will have the name "Joe" as the caption.
How can my dataset have SQL data that references my label object on my form?
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Jun 8, 2012
Referencing an object (class) within a thread fails
I have an object ("a vb class") that needs to run on a separate thread and communicate with the U/I.
Even using sample code, I cannot get the object to run within a thread. I demonstrate this problem with two examples. The first calls a function within the form and it works perfectly. The second creates an object and performs the same calls, but fails.
example #1 [working] (Called within a form)
Private Delegate Sub FuctionToBeRunInThreadDelegate
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
[Code]....
SUMMARY: When the thread creates the object, it appears that the object is not actually running inside of a thread or else form.InvokeRequired would be true. I have other more complex examples where this is strongly verified and evidenced, but I provided these two as a very simple demonstration of my problem.How can I have a thread "own" a series of individual objects so that the objects are run asynchronously and can independently report back to the U/I?
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Dec 30, 2009
i'm trying to reference an object dynamically inside a loop; something like this:[code]
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Sep 19, 2010
Often I have a list of object A, and I have another object type B that needs to hold a reference to one instance in that list. So, as far as I can imagine, it's three ways to hold such reference:
1. Make B hold the instance variable of type A
2. Make B hold some other key/ID of the A instance
3. Make B hold an integer of the list index of the A instance
I guess 3 is quite limited, and mostly suited for use locally inside a method, in a for-next loop etc. But with the other two I tend to have the feeling that I should use 2) over 1), as I believe I shouldn't "duplicate" the object.. But wonder if that is a mistake. I guess it's only holding a reference to the stack memory, so it doesn't really make any overload compared to holding just an integer key/ID..
Further my thought is that with 1), I don't have to loop through the list to get the correct instance, as it already holds it. However if A changes, it may not be reflected in B.A, if the A has been given a new instance, so then 2) would instead give access to the updated object A. So perhaps if A is a "dynamic" object that may have been reinitialized (if that's a word), I need to use method 2). However if it's a type of object that is only changed when for example the user opens a program settings form, and this setting form only changes value type variables, then perhaps 1) is appropriate?
This is kind of the case I have some times, and I wonder if I should then use 1), as it doesn't require me to loop through the list by key/ID. It makes other object hold the full reference, which is not really necessary, but maybe still more efficient? Although at the same time, maybe I shouldn't really care much about looping through an object list either, if the list is not very big.
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Oct 8, 2010
I have several sets of similar objects (labels, progress bars) on a form in Visual Basic 2010 on Windows. In my code, I have collections that contain data, which needs to be pushed into the value/text property of each.
I would like to get a solution similar to PHP in that I can assign values somewhat like:
For ID as Integer from 0 to count(collectionExample)
lblExample{ID}.Text=collectionExample(variableID)
...and as such to loop through so each of the different lblExample's were updated to their corresponding value.
The issue I have come to is that I cannot seem to reference an object on the form using a variable. I have also tried using something like
CallByName("lblExample" + variableID, "Text", CallType.Set, exampleCollection(variableID))... however I still can't combine the string and variable to reference the object.
Any solutions on referring to objects in VB2010 by combining a string prefix and a variable string identifier, similar to PHP's $variable{$variable} approach?
Edit: Windows Platform
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Jun 30, 2011
I was directed to update an old VB6 dll to VB .net as we are moving away from COM objects. The dll contains one function that does a bunch of high math calculations. I opened up a new class project in VS 2005, Imported System.Math, and then basically copied the function code from the VB6 project into the new class. When compiling, I made the assemble COM-Visible and also checked the Register for COM Interop in the project properties. I then copied the dll and tlb files to Windows/system32 and tried to register using Regasm.exe.
Even though I'm using the correct version for .Net 2, I still get error RegAsm : error RA0000 : Failed to load 'C:WINDOWSsystem32eagetairmiles.dll' because it is not a valid .NET assembly. When attempting to add a reference to it in my new .Net project, I see it in the COM tab - but in the location it was developed in, and I receive the following error: Converting the type library to a .Net assembly failed. Type library mydllname was exported from a CLR assembly and cannot be re-imported as a CLR assembly.
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Apr 16, 2009
example:textbox1.text = "frmHelp"...is it possible to go to the form (.show) by simply using the form's name, also how?
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Jun 30, 2010
I'm making an application that will be available as both a Windows App and an ASP.Net App. The web app has a much scaled-down version of the functionality of the window app. I want to reference the classes contained with the windows app from my web app. The thing is, my classes in the windows app may have some modifications: if I reference them in my web app, will this pick up the changes made automatically? Also, referencing the project is for development work, when I go to deploy the web app, I will probably need to reference the classes as dll's. So the next questions are: 1. Is this the right way to go about doing this?
2. How do I make the Classes I have into self-contained dll files?
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May 10, 2011
I have an application that creates desktop shortcuts. To do this I have to reference the Windows Script Host Object Model. When I add it as a reference, it always creates the DLL, Interop.IWshRuntimeLibrary.dll, in the objx86Debug directory, then references itself to it, rather than looking at wshom.ocx. Even if I add reference wshom.ocx it reverts to saving the file in the objx86Debug directory. The problem is if I move my application to another computer without that DLL being present, the program fails to run.
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Sep 9, 2011
I have an asp image within my "default.aspx" page.I set cookies on my masterpage vb file and depending on the cookie set, I want to show or hide this image.
default.aspx
<asp:image ImageUrl="/images/myimage.jpg" runat="server" ID="myimage" Visible="false"></asp:image>
mymaster.aspx.vb
[code]....
I get the following error:
'myimage' is not declared. It may be inaccessible due to its protection level.
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Sep 4, 2010
i have this code in asp.net 2005 page under vb codes on myreader.Read gives me "variable myreader is used before it has been assigned a value a null reference exception" and in the ex msg " object reference not set to an instance of an object".
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Nov 3, 2009
i trying to do login form, if user & password correct, then will show Main Form. First time login is no problem at all, after closed the Main Form, it will back to login form. Problem come when i try to relogin again & show "Object Reference not set to an instance of an object" when try to access the database. Attach my code here:
frmLogin -
AppPath = Environment.CurrentDirectory
DBFilename = AppPath & "DatabaseBT2 Test Results.btd"
frmMain.txtDBFilename.Text = DBFilename
[Code]....
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May 12, 2009
For some reason, on the line where I try to set the value of the key, I get the following error:
Object reference not set to an instance of an object
vb Private Sub writeToKey(ByVal regValue As String)
Dim regkey As RegistryKey = Registry.CurrentUser.OpenSubKey("SoftwareMicrosoftWindows NTCurrentVersionWindowsDevice")
regkey.SetValue("Device", regValue, RegistryValueKind.String) 'error occurs here
regkey.Close()
End Sub
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Mar 14, 2010
I am attempting to figure out why this code is not working in VB2005.I am trying to run a check on a set of 25 buttons in a 5 by 5 square. they are label "cmd" & X & "x" & Y whereas X and Y are the x,y coordinates.cmd1x1 through cmd5x5 I am trying for this code to set varMapBefore() to either 0(for D) or 1 (for L) for each of the buttons cmd1x1 through cmd5x5 and then join them together at the end for an output.but varMap wont act like an object. What am I doing wrong?
Private Sub cmdStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdStart.Click
Dim varMap(0 To 24) As Object, varMapBefore(0 To 24) As String, varMapAfter(0 To 24) As String, varCheck As String
Dim varCount As Integer, varX As Integer, varY As Integer
varCount = 0
[code]....
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Sep 15, 2010
while writing some value to registry i am getting error as Object reference not set to an instance of an object. my code is like this
[Code]...
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Jun 24, 2009
Alright I'm pretty new to VB and having a little difficulty with an Add Button.I'm using the same code for around 7 add buttons in my database (Customer etc).However I get this error message on my personalised product page.A couple of the other pages have a different error as well but the others work perfectly fine.
The bold piece of code is where i get the error message.
[Code]...
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Aug 12, 2011
This maybe a long shot because the treeview I am talking about it a component one control. Basically I build a menu structure up using a treeview. But as a build the menu if an item equals a certain value I want to recursively go back up the tree expanding any branch nodes which works until I get to the very top. Here is the
Private Sub ExpandTree(ByRef Item As C1TreeViewNode)
Dim ParentNode As C1TreeViewNode
If Item.Owner = "" Then
[code]....
Basically on the 'If Item.Owner = "" Then' what I need to do is trap for the type of the Item.Owner because when it gets to the top the owner is no longer a C1TreeViewNode type but a C1TreeView and I can't work out how to trap for this. Basically once is gets to C1TreeView exit the loop.
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Jul 16, 2007
how do we add a shockwave flash object to visual basic 2005 express edition without the message saying: Failed to import the active-x control. Make sure it is properly registered.
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Feb 3, 2011
Here's what I'm looking to do. I have an array of objects that all implement a particular interface. What I want to do is search that array of objects for a particular object type.I have to do this in several places, so I'm trying to create a function where I pass in the object array and the type that I'm searching for, and have that function return the object that matches that type - or nothing if no match is found.I wrote the following, but it isn't working, so I'm missing something:
[code]...
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Apr 7, 2010
I am writing a app and I have a treeview. This treeview gets populated with parent and children. I also have a panel and a picturebox with a image in the picturebox. On top of the picturebox I and writing some Graphical objects.
See code
Dim theG As Graphics = Graphics.FromImage(PictureBox1.Image)
Dim ComputerName As String = ""
Dim UserName As String = ""
Dim NodeIP As String = ""
[Code] .....
When Afterselect on the treeview item this code runs. However when I select another child/node the code runs again whcih is great it write over the top on the previous text. What is the command or how do I clear/delete/remove the theG.drawStrings from the first AfterSelect from the treeview so the new drwstrings are clear.
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Sep 25, 2010
I would like one of you to help me out. I have a problem with the code, I have input the valid username and password in the form textbox, but I got the error of object reference not set to an instance of an object.[code]
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Oct 14, 2009
Is there any way that I can use to check the datatype of an object??What I want to check is like below (yes, below will not work. Its just a scratch logic).
example:If TypeOf(objPasser) = Integer Then
.....
ElseIf
[code]...
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Jun 23, 2009
I'm using a com object in my vb net application. I'd imported the com library and everything is fine.But the object does not raise events, None. I need to know if there is some way to achieve that it works.
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Sep 25, 2011
i am creating project using Console Application . In this project i have class car and Module1. I also declared Public Color as string in Car class. In module1 i set the color property for this objectcar.The probleam is i still get an error Name 'red' is not declared. i also highlight line which give me this error.
Module Module1
Sub Main()
Dim objcar As New Car
objcar.Color = red
[code]....
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Jun 10, 2009
Is it possible to extend the MyApplication object - either through inheritance or by using a partial class - so as to add custom properties?
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Mar 26, 2009
I updated one reference in my project and all of the sudden, every time I run my app I get the following error:
Error Stack Trace
The details of where this error occurred are as follows:
Source: frmMyForm.designer.vb
[code].....
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Nov 3, 2009
I have program which is used to send emails. In this program I want to design a message body which contains, text, hyper links, images, draw boxes, etc. Rich Text Box object doesn't appeared to be the best object for this case. Can you suggest a good object to design "Body" part of a message?
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Dec 17, 2009
I have a sub that I want to receive a My.Settings object. I don't know, though, which kind of object to use in the declare line of the sub. For example:[code]
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Sep 8, 2009
I want to create a json object in vb.net to send the response back javascript function to do something?
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