VS 2008 : Calling A .NET Assembly From VB6?
Jun 30, 2010
I have created a .NET assembly, clicked 'Register for COM Interop' on the properties page, strongly named it and compiled it. Then I GAC'd the .NET DLL manually. Calling the .NET assembly from my VB6 code with 'CreateObject("MyNETProject.class1")' gives me an automation error. I've gone through about 3 iterations of this for most of the day and cannot sort out what I'm doing wrong. I have a feeling it's got to do with my .NET assembly settings and GACing but it all seems right.
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Jun 25, 2012
I have created several DLL (.NET) libraries that are used in several projects. In these DLL libraries I want to know/retrieve which assembly (EXE) calls/uses the library, so if possible I want to know info like assembly name (EXE), strong name, version number, etc.
NB: Examples may be in C# or VB. I use both languages.
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May 18, 2010
Let's say we use NASM as they do in this answer: how to write hellow world in assembly under windows.I got a couple of thoughts and questions regarding assembly combined with c# or any other .net languages for that matter.First of all I want to be able to create a library that has the following function HelloWorld that takes this parameter: Name In C# the method signature would looke like this: void HelloWorld(string name) and it would print out something like Hello World from name To sum it up Create a routine in ASM ( NASM ) that takes one or more parameters Compile and create a library of the above functionality Include the library in any .net language Call the included library function Bonus features How does one handle returned values?Is it possible to write the ASM-method inline When creating libraries in assembly or c, you do follow a certain "pre defined" way, the c calling convetion, correct?
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Dec 26, 2011
I want to use reflection to dynamically call a dll (not an assembly, non-managed, possibly COM object model) in vb.net.I've seen several different methods of calling a method in a dll that is a .net assembly - but I have not found the way to dynamically call a method inside of a dll like user32.dll or winmm.dll. I believe this would be called late-binding?
The reason I'm asking is because I am building a language that will depend on external libraries for lots of different functionality. An example (in this language I'm building):
Declare Function mciSendStringA using "winmm.dll" (strCommand As String, strReturn As String, returnLength As Integer, blah As Integer) As Integer
Declare Function WriteConsoleA using "kernel32.dll" (hConsoleOutput As Integer, lpBuffer As String, numberofcharstowrite as Integer, lpReserved as Integer) As Boolean
When I build the interpreter for the call to mciSendString in winmm.dll, how can I use reflection to handle this? I want the user to be able to reference any dll/method they wish.Can I get some guidance in the right direction? Perhaps even some vb.net code that I can take apart and understand?
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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 9, 2009
When I am loading an Assembly dynamically, then calling a method from it, I appear to be getting the method from Assembly executing before the code in the method that is calling it.It does not appear to be executing in a Serial manner as I would expect. Can anyone shine some light on why this might be happening. Below is some code to illustrate what I am seeing, the code from the some.dll assembly calls a method named PerformLookup. For testing I put a similar MessageBox type output with "PerformLookup Time: " as the text. What I end up seeing is:
First: "PerformLookup Time: 40:842"
Second: "initIndex Time: 45:873"
Imports System
[code].....
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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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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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Apr 7, 2009
I have written a .net assembly which plugs into to a third party COM application. The .net assembly is COM visible to the third party application. However this .net assembly references other regular assemblies. If I put these assemblies in the GAC the COM visibile assembly sees them without a problem. However for various reasons I do not want to put them into the GAC but I cannot get my COM visible assembly to see the other assemblies when they are in other locations. I have tried putting them in the same directory as the COM visible assembly. I have tried putting them in the same directory as the third party app's exe but neither of these work.
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May 31, 2009
When ever I finish simple programs no matter what it is and i click to debug it it comes up"Error while trying to run project:could not load file or assembly"project name" or one of its dependencies.the module was expected to contain an assembly manifest"
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Apr 21, 2011
sorry for my English, I don't speek well... I need to compile assembly in memory, that can compile another one. There is a form with one button. Here is a code of the form
Imports System
Imports System.Threading
Imports System.CodeDom
Imports System.CodeDom.Compiler
Imports System.Collections
[Code]...
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Jan 14, 2010
Since, it's possible for anyone to name an assembly starting with 'System', checking for 'System' is not a satisfactory solution.
Alternatively, if that's not possible, how about checking the modules in an assembly?
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Jun 20, 2010
I am building a dll-Assemby A which references another Assembly B. Assembly B is strongly named and installed in the GAC of my development computer. An other computer will not have assembly B installed in the GAC.
Question: If i handle strongly named assembly B like a private assembly and copying it into the bin-directory by specifying local copy = true in the properties-window, will the programm run on the other computer?
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Oct 8, 2009
One of them is giving us trouble in only 1 spot out of the 4 spots we use it at:The trouble spot is a windows form project that uses reflection to dynamically load some DLLs that run long running processes. One of these long running processes is an agent that relies on one of our vender DLLsWe're getting the missing assembly exception at the point where we first enter a function that references the library. I already checked the silly things such as if we had forgotten to move a reference from the old version to the new version, but that's not the case. I also checked the bin directory of the project and the assembly is there.
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Jul 13, 2009
When I go to my project properties I can see the Assembly Name under the Application tab. Now if I click the Assembly Information button I see some other settings such as title, description, company, etc. I can get the name by doing: Assembly.LoadFile("c:\filepath").GetName().Name.ToString()My question is how can I get the title, description, company, etc. I have tried a few things but nothing seems to work. Also I was told that you can create custom settings. How would you do this and how would you access them?
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Dec 25, 2009
I'm trying to learn more about assembly security (something I have basically neglected until recently because security in general is such a huge topic), and I have a question about CAS assembly level declarations.I get how to use them (basically) and the more blunt points of the subect, but I'm still not clear on where assembly level declarations should be made. Basically, where in the solution do you put:
<Assembly: CodeCodeCode> _
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Mar 30, 2009
I am reference DLL files programming in my application. My question is once they have been called and used is there anyway to "un-reference" them so I can move them?
CODE:
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Nov 16, 2009
i am loading an assembly with reflection through a partial name ... in this case "system"
vb
Assembly.LoadWithPartialName(Filename)
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Apr 20, 2010
I have a COM application (X) that references various .NET assemblies. All the .NET assemblies, with the exception of one (Y), were created a while ago and reference an earlier version of a 3rd party component, say version 1. The other .NET assembly (Y) uses a later version of the 3rd party component, say version 2.When I install the COM application (X) on the target pc, version 1 of the 3rd party component is installed in the installation directory of the COM application. The .NET assembly (Y) is installed into its own directory on the target pc and has version 2 of the 3rd party component installed in its installation directory.
When I run the COM application (X) and try to launch (Y), I get an error because I guess the COM application is forcing (Y) to use the version installed in its app.dir, in this case version 1 as opposed to version 2. Is there any way around this? It seems a bit much to have to rebuild all the projects that reference this assembly just to sync versions.
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Aug 20, 2010
I've had a vb.net application for quite a while. Today, when I tried to load a form (one of many in the app) in Design mode, I got the error: "Could not load file or assembly 'Interop.MSMAPI, Version=1.1.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified." This form is the only form using msmapi, and the only one that won't load in Design mode.I can edit the form's code, run the application, and deploy the application. But I cannot access this form in Design mode. It's been a few months months since I've opened this form in Design mode, but it worked last time I tried it.
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Jul 2, 2010
I am a software developer. I work with Visual Studio 2008, Visual Basic, Windows Seven. My program is developped with framework 2.
Everything was going fine until two days ago when the ngen utility has stopped working.
I use ngen utility on post-build event for some assembly.
I try to use ngen on command prompt the result is this:
C:Userslucam>C:WindowsMicrosoft.NETFrameworkv2.0.50727
gen.exe install c:
NUOVAMACUTSourcesNMLibinNMClassCreator.dll
[Code]......
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Feb 10, 2012
I have an industrial control program that we install on OEM equipment. This equipment falls into one of two categories; those WITH a special piece of IO hardware installed on the computer and those without.
This IO hardware has .NET 3.5 support assemblies, and is easy to program for. In my program, I reference the assemblies under the Project Properties and I'm good to go. Here's my problem... my program now seems to NEED this assembly to even start up, even if I'm not directly accessing anything in it until much later in the programming. When we ship any version of this equipment; I need to install the IO hardware assemblies whether the equipment needs it or not just for my program to run. The assemblies are bundled onto a hardware driver disk, and this sucker is 3gig.
What I would like to do is alter my program so that it runs no matter if it finds those assemblies or not. If not, then it will automatically close off certain functionallities (you can't use that because your computer don't have the hardware installed); and ideally, Visual Studio won't have 100 errors about a "missing reference". If found, then it will call them and use them normally as the program currently does.
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Sep 6, 2009
I saw one post on which someone was recommended to sign he's assembly, why is this important?
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Jun 1, 2011
I wrote some string extension methods in a VB assembly and am unit testing them from a C# project. However, C# acts like it cannot see the the extension methods, when other VB projects reference the VB assembly they have no problem. Both the VB assemebly and the C# test project are targeting .Net 3.5. Is there a way around this?
[Code]...
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Feb 17, 2012
I am trying to import the GetWindowText in a VB.NET application.So based on other sites you just have to import the interopt service and add a DLLImport statement similar to C#. But somehow it is not recognizing the statement and getting a BC30001 (Statement is not valid in a namespace) compile error.
Here is the code I used.Imports System.Runtime.InteropServices
<DllImport("user32", CharSet:=CharSet.Auto, SetLastError:=True)> _Public Shared Function GetWindowText(ByVal hWnd As IntPtr, <Out(), MarshalAs(UnmanagedType.LPTStr)> ByVal lpString As StringBuilder, ByVal nMaxCount As Integer) As Integer End Function
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Jan 12, 2010
I crate program with Visual Basic 2008 Express Edition. And it works about 2 days. Then it get error:
---------------------------
Microsoft Visual Basic 2008 Express Edition
---------------------------
Error while trying to run project: Could not load file or assembly 'airGreenClient (aGC)' or one of its dependencies. The module was expected to contain an assembly manifest.
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