Returning Object From COM Assembly Into VBA (Access)?
Mar 15, 2011
I have an assembly in VB .NET 2.0 that I am trying to use to call a webservice.This will be COM visible, and return the results to Access in VBA.The .NET Assembly passes all tests and executes perfectly.I was experiencing "Object does not support this property or method" errors when calling the methods from VBA.I broke it down to a certain object that was being returned and added some test methods to the .NET DLL.There is a "Patient" object I want to return.It looks like this (made it very very simple to test it):
Option Strict On
Option Explicit On
<ComClass(Patient.ClassId, Patient.InterfaceId, Patient.EventsId)> _
[code].....
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Sep 15, 2009
Each business object has a matching object that contains sql calls. I'd like to restrict these sql objects in a way where they can only be used by the matching business object. How can this be achieved?
Update Greg brought up the point about testability. Since the SqlObjects will contain very business-process specific sql I don't want them reused in multiple buiness objects. (Basic CRUD operations are all code-generated) Is there a way to make the SqlObjects accessible to only one business object in the business assembly (like yshuditelu and Greg Beech showed) AND expose the SqlObjects to the unit testing assembly?
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Feb 8, 2012
If an object is created inside a function and the function returns that type of oject how is the memory handled.
Example:
Public Function GetEmployee(employeeid as integer) as employee
Dim oEmployee as new employee
oEmployee.FirstName="Bob"
[code]....
Does the variable that receive the object still a pointer to the memory location that was used inside the function?What about when you do a oEmployee2=oEmployee.Is oEmployee2 just a pointer? And any changes to oEmployee will now affect the other. Just trying to understand it from a memory perspective and how that scope works?
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Sep 30, 2011
I'm working on a small game that is based on a map of grid squares.I have a class (clsGrid) that stores a few properties for each grid square.The grid square objects are organized into a list(of clsGrid).A loop and stream reader are successfully reading properties from a text file, putting the properties into grid objects, and adding the grid objects to a my list of grids. When retrieving a grid from the list of grids, I'm getting unusual results. Regardless of the index I give the list, I always seem to get the last indexed grid in the list.The debugger seems to suggest that the right numbers are being read into the stream reader and they are being added to gridHolder. However, the message box at the end will always show me the LAST grid.id, regardless of the index I give it.
'A subroutine that generates a map (list of grids)
Sub GenerateMap()
Dim reader As StreamReader = File.OpenText("map1.txt")[code]....
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Oct 28, 2010
When a json result is returned by the controller the object name seems to be missing, I normally wouldn't mind but the flexbox jquery plugin requires the json result in a particular format.
[Code]...
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Apr 21, 2011
let's say I have 5 DLL files that are each a partial class, that they should form together... Is there a way I could load these 5 files into 1 assembly object ?
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Jun 12, 2011
I want to send a serialized object from my server to the connected client. A little problem is that the BinaryFormatter needs the source assembly to deserialize the object properly.
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Mar 22, 2011
How can I create a function that returns an object of a certain type, which the user of the function specify in the argument (using vb.net 2010) ?
[Code]...
The code above doesn't work, but maybe it can explain what I want to achieve. Using this feature, I want to hydrate my data transfer objects from datatable. Client will just call this function, specifying which DTO the client wants, and this function will just create that DTO and populating the properties with reflection GetType.GetProperties().
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Jun 11, 2012
So In Default.master.cs PageLoad I have the following[code]...
However this is causing the following exception!object reference not set to an instance of an object.
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Mar 15, 2011
I have this problem that just recently started happening.I've created this snippet that isolates the problem, which is basically, the same VBScript that used to return all of my users from Active Directory, now only returns the first 100 users.If I filter by group, then i get all of the groups (which is more than 100).The problem started happening last November, then went away for a while and has come back.The server guys tell me that nothing should have changed there.When I run this script for various domains, i get a numbered list of just the first 100 users.I'm running this on IIS (which hasn't changed)[code]
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Oct 11, 2010
I am generating an Excel file upon a click of a button in an update panel. It is throwing a parsing error.If I keep the button outside the update panel it is working fine. Why isn't it working in the update Panel?
Response.ContentType = "application/vnd.ms-excel"
Response.AddHeader("Content-Disposition",
String.Format("attachment;filename={0}", filename))[code].....
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Oct 10, 2011
I agreed to trade some code with my wife (her SQL for my .NET), but I am running to an issue on my side. I have taken some old vb that she is needing converted to .NET and made it work, but there are two lines of code:
DoCmd.SetWarnings(False)
'and
DoCmd.SetWarnings(True)
I have found out that these are objects related to using Access, but i can't figure out how to use them in .NET. It seems that, in the original code, they are used without instantiation, but I get the "Reference to a non-shared member requires an object reference" on those two lines of code. I have never worked with Access before, but it seems like it would be a simple fix if I just knew exactly what was having its warnings enabled/disabled.
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Apr 12, 2010
I want to create a vb.net project that I will use to only hold image and string resources that I will need in multiple projects.What I can't figure out is how do I access these resources using code from other projects.
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Jun 22, 2010
I have a simple application, that was working just fine then all of the sudden I open the file and the design pages will not show up and I get the following warnings:
Warning 1 Could not load type 'System.Object' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' because the parent does not exist. G:ProgramsCONNS v 1.0ConnectionsFrontPage.Designer.vb 149 0
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Mar 3, 2009
How to I reference my own .dll after i add it to the GAC? I successfully added my .dll to the GAC, have seen it in the list. However, when i try to reference in Visual Studios..... i am lost.
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Aug 27, 2009
I have an RDLC report that I am rendering directly to the Response Stream as PDF (rather than using the ReportViewer). In the code that renders the report, it's DataSource is bound to a List(Of ClassA) objects defined in a custom assembly. This seems to work for the most part. My problem is that I can't seem to handle the situation where a nested object is null. For example, given ClassA and ClassB (the nested object) defined as follows:
Public Class ClassA
Public Id As Integer
Public Name As String
[Code]....
the report displays "#Error" if TheNestedObject is null. If TheNestedObject is not null, it correctly displays the Name.
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Mar 20, 2007
I cannot figure out how to get past this error. I have 1) Given the user "everyone" access to the entire directory that this dll is contained in 2) Deleted the dll and rebuilt the project 3) Deleted the Temporary ASP.NET files in the Windows Directory 4) Restarted IIS 5) Tried to change to a different user in IIS security including trying ASPNET. we are not using windows authentication. 6) Even copied that dll from other machines.
Here's the error. I have no clue at this point if it's code missing inside it or something else wrong with it or my setup. Other people on my team are using this dll ok. Could not load file or assembly 'Anthem' or one of its dependencies. Access is denied.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System. IO.FileLoadException: Could not load file or assembly 'Anthem' or one of its dependencies. Access is denied. [Code]
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Dec 31, 2009
Occasionally I encountered this exception message while trying to download file from a server using System.Net.FtpWebRequest and System.Net.FtpWebResponse Object.
Download a file.ftpRequest_DL.Method = WebRequestMethods.Ftp.DownloadFile get the response object
Dim ftpResponse_DL As FtpWebResponse = CType(ftpRequest_DL.GetResponse, FtpWebResponse)
[Code]...
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May 3, 2011
I was create Access database with Access 2003. I create VB project with Visual Studio 2005 Standard With connection wizzard I create coonect with this Access database, select all tablesI see this database inside Data sources and inside Server explorer Test connection is OK When I drag and drop table from Data sources, Wizzard don't create DataGridView, DataSourceBinding etc .. and I see popup window with mesage: Object reference not set to an instance of an object and then "game over"
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Jul 6, 2011
I have a solution with several Projects in it. There is a Windows App project (called ImportClient), and a Class Library (Import.Library). The Import.Library has functions to perform data imports (I have other applications in the solution that also need to call it). But the interactive application, I want to be able to pass in some form controls, and have it update the GUI. No problem. But, I also want to execute a DoEvents() so that the loop execution doesn't hang other interaction to the app.
So, ImportClient has a reference to Import.Library. But I can't add a reference to ImportClient to the Import.Library, because the compiler complains about circular reference, etc. I don't know how else to define the My.Application object of ImportClient as a parameter to the data function in ImportLibrary.
(I realize this is a dumb question - problem is, for this project I have a tight timeline, and haven't learned how to do the BackgroundWorker process. If you think I could pick it up quickly, I'm open to some hints about how to update the progress bar on the GUI, and how to pause / cancel the background task.)
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Dec 28, 2005
When running setup to install published program, the following message occurs: System Update Required: Unable to install or run the applicaiton. The application requires that asssembly CrystalDecisions.CrystalReports.Engine Version 10.2.3600.0 be install in the Global Assembly Cache (GAC) first. This version is listed in the references of the program and in my mind, be included in build. How do I get by this error?
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Apr 18, 2012
When running setup to install published program, the following message occurs: System Update Required: Unable to install or run the applicaiton. The application requires that asssembly CrystalDecisions.CrystalReports.Engine Version 10.2.3600.0 be install in the Global Assembly Cache (GAC) first. This version is listed in the references of the program and in my mind, be included in build. How do I get by this error?
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Dec 4, 2009
I have recently upgraded an VB6 project to vs2008. I was almost finished when the following error occured. Unable to emit assembly: Referenced assembly AxInterop.MSFlexGridLib does not have a strong name Prior to this error appering, I tested my app several times and it was fine. Only after publishing it did the error appear. I have tried all solutions I could find, but nothing helps. I have read [URL]
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Jun 17, 2009
I receive this error as "Assembly Load Error" whenever adding a form or other object that has to be inherited.
"Unable to load assembly. Ensure that the file is a valid .net Framwork assembly"
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Apr 2, 2012
I am loading an Assembly using Assembly.LoadFrom() as the assemblies are located in a different path from Application Base directory.
Dim oAssembly As Assembly = _
Assembly.LoadFrom("C:\MyFolder\" + ddlXlate.SelectedItem.ToString() + ".dll")
And I consume a Type from that assembly without any problem:
oXML = CType(oAssembly.CreateInstance(sBaseType + ".XlateContainer"), _
XlateBase.XlateContainer)
However, the problem occurs when I try to use a Type from this assembly from within another method like the one below:
oComboBox.DataSource = _
[Enum].GetValues(Type.GetType(sType + "+ItemEnum," + sAssemblyName))
sAssemblyName is the one I loaded using LoadFrom() actually. After it said it cannot find the assembly, I used AssemblyResolve event which solved my problem :Subscribing AssemblyResolve event :
AddHandler AppDomain.CurrentDomain.AssemblyResolve, _
AddressOf MyResolveEventHandler
Event Handler Method:
Private Shared Function MyResolveEventHandler(ByVal sender As Object, _
ByVal args As ResolveEventArgs) As Assembly
Return Assembly.LoadFrom("C:\PSIOBJ\" + args.Name + ".dll")
End Function
And I thought maybe the error occurs because it cannot find a dependent assembly defined in assembly manifest file I loaded using LoadFrom() already but when I checked the args.Name, I saw it was trying to load same assembly and after that it worked without any problem. So basically a type in the loaded assembly cannot be found before the event adding change.
My old code was using AppDomain.CurrentDomain.Load() and Assembly.Load() methods and they were working fine without the AssemblyResolve event. I was able to reach types in dynamically loaded Assembly from every where within the same AppDomain.
LoadFrom() can find dependencies automatically within the same requested assembly path and that couldn't be problem as everything this dll needs was there. So at first it looked like a AppDomain problem to me as it looks like it seems it can reach assemblies from Load context instead of LoadFrom context and I am now using LoadFrom context.But now it seems I should pass oAssembly instance evertwhere to use any type from the loaded assembly?Doesn't it load the assembly where I can reach it everywhere (same AppDomain) using simple Type.GetType(...) method?
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Jun 1, 2011
I'm wanting to include a system tray icon in my WPF project, and found this resource:[URL]..which looks like it will work beautifully, but it's written for C# and I'm using VB.net for this project. I downloaded his project and built the notifyicon as a DLL, then added as a reference to my project.
It throws up an error: Unable to emit assembly: Referenced assembly 'Hardcodet.Wpf.TaskbarNotification' does not have a strong name So I'm trying to figure out the best way to proceed. Do I need to strong name it, or is there a better way to do this?
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Oct 9, 2008
I've got an exception when I deployed my application: "the located assembly's manifest does not match the assembly reference" What I remember is changing the project name from the previous source code, does it affect that much?
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Mar 15, 2012
I have an ASP.NET web application (VB.NET) using an Oracle database. On an insert, I need to get the identity of the inserted row back. I am trying to use RETURNING, but I keep getting a value of 1 returned.
Dim strInsert As String = "INSERT INTO L.TRANSACTIONS (LOCATION_KEY, TRANS_CREATOR, TRANS_EMAIL, TRANS_PHONE) VALUES (:location_key, :trans_creator, :trans_email, :trans_phone) RETURNING TRANS_ID INTO :ukey"
[Code].....
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Feb 26, 2011
I'm trying to re-write an old VB 6 OCX into a VB.net DLL and I'm having problems accessing the object returned from a COM object. Here is a snippet of the old VB 6 code: Dim objResult as Object
[Code]....
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May 29, 2010
i created a DatagridViewNumericUpDownColumn but i got error message Cannot access a disposed object. Object name: 'NumericUpDown' when i closed and reopen the form. what can i do to solve this problems? i checked from the web & i found the answer, but i I couldn't get authorized to view this thread. When i clicked on the link[URL]..It shown You are not authorized to perform this action.
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