Visual Studio 2022 - guide with Interop Assembly when Using COM Objects in a WinForms Application
Could someone explain I'm migrating some code and I'm working with a frustrating scenario when trying to utilize a COM object within my WinForms application in Visual Studio 2022... I've successfully added a reference to the COM library, but when I attempt to instantiate the COM object, I get the following runtime behavior: `System.Runtime.InteropServices.COMException: 'Unable to cast COM object of type 'YourComObject' to interface type 'IYourComInterface'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}' failed due to the following behavior: No such interface supported.'` I've tried the following steps to troubleshoot the scenario: 1. Ensured that the target framework matches the COM object's requirements (using .NET 6). 2. Verified that the COM component is properly registered with `regsvr32`. 3. Checked the bitness (x86/x64) of my application and the COM component; both are targeting x64. 4. Used `tlbimp` to generate a wrapper assembly for the COM library to see if that would help. Here’s the relevant code where I’m trying to instantiate the COM object: ```csharp using YourNamespace; public partial class MainForm : Form { public MainForm() { InitializeComponent(); try { var comObject = new YourComObject(); // This line throws the COMException // Do something with comObject } catch (COMException ex) { MessageBox.Show(ex.Message); } } } ``` I also checked the references in the project settings, and the COM reference is set to "Copy Local = True." Any advice on resolving this scenario would be greatly appreciated. Is there something specific I might be missing or a common pitfall when working with COM objects in Visual Studio 2022? Any feedback is welcome!