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Create a Tlb from a Dll: Tips and Tricks for Using OLE-COM Object Viewer and MIDL



You cannot use Tlbexp.exe to produce a type library from an assembly that was imported using the Type Library Importer (Tlbimp.exe). Instead, you should refer to the original type library that was imported with Tlbimp.exe. You can export a type library from an assembly that references assemblies that were imported using Tlbimp.exe. See the examples section below.




How To Create A Tlb From A Dll



I have to use third party, unmanaged COM dll into my .NET application. I need to modify this assembly to produce a custom RCW. In order to Edit Interop Assembly I need the type library of the particular assembly. Can any one explain me that how to How to generate type library from unmanaged COM dll?


If all you have is that COM DLL, you can't generate a type library. A type library describes the COM interfaces implemented. But an unmanaged COM DLL merely needs to expose DllGetClassObject. This only gets you an IClassFactory, which lets you create new objects if you knwo the correct type up front.


Visual Studio IDE can directly extract binary resources from non-managed .exe and .dll files.If the type library is saved as a binary resource in a non-managed COM DLL (e.g. one built using VS native C++ compiler), you can extract it as follows:


We are familiar that Sage 300 ERP allows customization of the standard screens, which have a different OCX name than that of the standard name. Sage 300 comes with many features and modules to make users life easy , apart from that sage 300 can also be customized as per user needs and preferences, we can make many customizations into existing screens or create a new module as per user preference, whenever we perform any type of customization in Sage 300 which has new screen files and other dependent files and which needs to be used in project, but we cannot use these files directly hence we make the codebase TLB. Below are the steps to automatically register codebase TLB, you do not need to manually register codebase TLB.


I am having some performance problems when calling a COM TLB methods from C# using the dynamic keyword (more information here). Scince I have not had any luck trying to optimise such call I am now looking at a way to convert my TLB library to a native wrapper DLL which I can use directly in my C# project (at this stage I am not even sure that this will help, but instead abstract the performance problems down a layer).


Additional information: Retrieving the COM class factory for component with CLSID FFB54BC4-B15E-11D1-99BC-0000E803C444 failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).


This example will help you understand how to implement and use a C# DLL in VB 6.0 code. As C# is an object-oriented language, we can use the object-oriented features to create proper classes in C# DLL. We can use COM Interop or follow the COM Plus Approach to refer to such DLLs in our old VB 6.0 applications. It's like delegating our business logic to this DLL. In this article, I tried to show two different approaches to refer to a C# DLL in VB 6.0. The code is attached herewith; you can directly refer to it to understand the following instructions or try to create your own code from the instructions.


By using COM Interop, we create a DLL that can be private or shared. This DLL can be referred to in a VB 6.0 application. A VB 6.0 application refers to a Type Library of this DLL, i.e., a file with the .tlb extension that is created using the VS tool utility. For a client of a COM object to have access to the object, the client needs a description of it, how to locate it and how to call its methods and properties. For a "real" unmanaged COM class, this description is available in the form of a Type Library. A Type Library is a binary description of the GUIDs, classes, and interfaces (methods, properties, and parameters) that the COM class supports.


.NET assemblies don't include information in Type Library compatible format. So, it is necessary for the programmer to run one of two .NET-supplied utilities to extract the assembly description of a class into a Type Library file. One utility is tlbexp.exe, the .NET Type Library Exporter. This command-line utility takes as input the name of an assembly DLL file to be converted to a Type Library. The programmer can also specify the name of a Type Library file to be created.


Once a Type Library has been created, it can be referenced by a COM client to obtain the information necessary for the COM client to bind to the interfaces of the COM class and activate the COM class at runtime. Another command-line utility for creating a Type Library from an assembly is regasm.exe, the .NET Assembly Registration utility. In addition to creating a Type Library, this utility also creates the Windows Registry entries necessary for making the assembly visible as a COM object to clients, as shown below:


Refer to the TLB of the assembly from the Release folder to use in VB6 applications. Please let me know if you have any questions. I have tried to make this article a readable one and I will try to improve it with your invaluable suggestions. Thank you.


I'm trying to use a toolbar that was developed by the EPA for BMP siting (see below link). The download seems like it should be fairly straightforward, an executable (BMPSitingTool_Setup.msi) is run and the toolbar is downloaded to the Program Files x86 folder within my C-drive. The BMP siting tool comes with a host of .dll, .tlb, .olb, etc files. According to the installation instructions, once I open a new ArcGIS map, it should find this new toolbar automatically and it should show up under Customize > Customize Mode. It doesn't. I've tried doing "add from file" and manually selecting the .tlb file but I get a message of "can't load type library from specified file" followed by "no new objects added". Any idea what's causing this? I'm on ArcGIS 10.3 and the tool was developed within ArcGIS 10.1, but I didn't think there were any compatibility issues with later versions of ArcGIS.


-- Rob Lans Todd Cary schreef in berichtnieuws 3849E22A.53960...@aristesoftware.com... Quote> I have the CDO.Dll on my systme. How can one create a Delphi > xxx_TLB.Pas file from this? > Todd > -- > Todd Cary > Ariste Software > t...@aristesoftware.com floor2_2(); dgg7();Other Threads1. Mapping *tlb.pas to a tlb


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Creating a DLL in C# or VB.Net is not that hard as long as you have object oriented programming experience or knowledge.After creating the DLL, I tried to reference it from Access VBA editor but kept getting the message"Can't add a reference to the specified file.". After some research on this issue, I learned some new tricks about (1) how to correctly create a DLL for Access or Excel (or any Microsoft Office applications or VB6 applications), (2) how to correctly register a C# or VB.Net DLL, and (3) how to correctly reference the DLL within Access VBA or Excel VBA.In this article, I'm going to show you how to correctly create a C# or VB.Net DLL in Visual Studio and use it inside MS Access, Excel VBA, or VB6 applications. Hope the tips can save you a couple of hours or days of headaches.1. Create a new C# (or VB.Net) project and select Class Library as the template type.Save the project (and solution) as SimpleCalc.Below I created a simple calculation class for testing. This class has two variable members and one Add() method.The method adds two integer numbers and returns the result.using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace SimpleCalc public class Calc private int numberOne = 0; private int numberTwo = 0; public void SetNumberOne(int number) numberOne = number; public void SetNumberTwo(int number) numberTwo = number; // Add two integers public int Add() return numberOne + numberTwo; 2. Configure project properties to make it COM visible.Open project properties dialogue window. Go to menu Project -> SimpleCalc Properties.When the project properties window is opened, click Application tab, and then click Assembly Information button.On the Assembly Information window, check Make assembly COM-Visible.Applications created in VB or VBA are COM-based applications. So the class library youcreated in C# or VB.Net must be created as a COM visible assembly. This allows COM-based applications to call the class library's member variables and methods.3. Register for COM Interop.In addition to making the DLL COM-visible, we also need to register the assembly as a COM component in the Windows registry. There are a few ways to do it based on your circumstances.For a development machine, we can check "Register for COM Interop" setting in Visual Studio. On the project properties window, click Build tab. Then check Register for COM Interop (Based on your version of Visual Studio, it could be on a different tab). This makes Visual Studio do two things automatically when the project is compiled. First, it will generate a .tlb type library file. Second, it will register class information for the COM component in Windows registry.The Register for COM interop property specifies whether your application will expose a COM object to client applicationsso that they can interact with your COM object transparently. Here is what is registered in Windows registry for the compiled assembly so that COM clients can use the .NET class transparently.Note that the path to the DLL is stored in CodeBase entry.To register the assembly on other computers such as production machines, you can register the assembly byusing RegAsm.exe. See this article for details.4. Compile the project.Build the solution. Then go to bin folder. Depends on whether your build is a Debug or Release build,you can find the DLL and .tlb type library file in either Debug or Release folder under the bin directory.In our case, it's D:\CSharp\SimpleCalc\SimpleCalc\bin\Release5. Copy the type library file to Windows system folder.Windows system folder C:\WINNT\system32 is the default location for DLLs and type libraries so we copy type library SimpleCalc.tlb to it.6. Reference the type library from Access VBA editor.First, create a new Access database and open Visual Basic code editor. In the menu cross the top, clickTools -> References...When the References window is opened, click the button Browse.Then browse to folder C:\WINNT\system32 and select file SimpleCalc.tlb and click Open.After done, SimpleCalc will appear in your reference list and you need to move down in the list to find and check it. Then click OKto close the Reference window.You may remember in the registry screenshot above, there is a DLL path value in CodeBase entry. VBA will use this registry informationto find which DLL to call. In our case, it's D:\CSharp\SimpleCalc\SimpleCalc\bin\Release\SimpleCalc.dll7. Use the DLL in your VBA code.To use the variables and methods in the C# DLL, we need to call the DLL inside VBA. Add a button to the Access form and then add a click event to it. In the click event we call a function called test() which is created within a VBA module. Below is a sample VBA to call SimpleCalc.dll. test() function invokes the .Net DLL by creating a new object from Calc class and then call its methods.Public Function test() Dim lngResult As Long Dim objCalc As SimpleCalc.Calc Set objCalc = New SimpleCalc.Calc objCalc.SetNumberOne (3) objCalc.SetNumberTwo (6) lngResult = objCalc.Add() End FunctionIf we debug and step through the test function, we will see the result is 9 as it's calculated inside the C# DLL and returned to VBA.You can see the result value either in Immediate window or by moving mouse over the lngResult variable.In this article, we have gone through the steps to create a .Net C# DLL and then use it inside Access VBA. It brings the power of .Netinto Microsoft Office applications. The limitation in this article is that Visual Studio registered our DLL and type library automatically for our development machine only. We haven't covered how to deploy the DLL to a production machine. In this case, check out this article about how to use Regasm.exe (Assembly Registration Tool) to register DLL on a target machine or production computer. Note that you can also create a setup package for your application and add regasm.exe as a custom command to the installer package.Happy Coding!Copyright GeeksEngine.comRelated Articles:1.How to correctly reference and call a DLL2.How to register a C# or VB.Net DLLOther Recent Articles from the MS Access category:1.Solved: MS Access error "The text is too long to be edited"2.Create MS Access Combo Box essential properties by VBA code3.Create MS Access Combo Box essential properties manually4.How to do text search in MS Access programmatically5.Solved - the size of the Access query result is larger than the maximum size of a database (2 GB)6.How to easily get a list of field names in MS Access7.How to count distinct records in MS Access8.How to do transaction based processing in MS Access9.How to open a document (local/network file or web page) from MS Access10.How to use ADOX to create unique composite index - the VBA approach11.How to do cross-table update queries in MS Access - the right way12.Three efficient ways to get the number of records by using VBA13.How to create a composite unique index (not as a primary key) in MS Access14.Use VBA to get the correct number of records in a Recordset object15.Disable Access Prompt when a record is changed, table deleted, or action queries run16.How to hide and unhide a MS Access object17.How to return multiple values from a VBA function (Part 3)18.How to return multiple values from a VBA function (Part 2)19.How to return multiple values from a VBA function (Part 1)20.Three ways to programmatically duplicate a table in MS Access by VBA21.How to correctly reference and call a DLL22.How to register a C# or VB.Net DLL23.Email address validation by Regular Expressions using VBA24.Fix MS Access error: Query must have at least one destination field25.How to unselect radio buttons in MS Access after it has been selected26.How to Change Query Timeout Value for MS Access SQL Queries27.What is Northwind Traders databaseCopyright 2023 GeeksEngine.com. 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