C#: DLL is registered but COM error 80040154 still appear

Question

When I debug my Windows Form Application I get this error:

Retrieving the COM class factory for component with CLSID {27526253-6119-4B38-A1F9-2DC877E72334} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

and because of it, my WFA can't interface with the software Solidworks installed on my computer; the only library that WFA needs to interface with Solidworks is SolidWorks.Interop.sldworks.dll (native position in the Solidworks directory C:\Program Files\SOLIDWORKS Corp 2017\SOLIDWORKS\SolidWorks.Interop.sldworks.dll).

Other informations below.

• Compiler: Microsoft Visual C# 2010 Express
• Operating system: Microsoft Windows 7 64 bit (updated)
• Logged account: Administrator
• Framework of destination of WFA: Microsoft .NET Framework 4.0 Client Profile
• Architecture of WFA: x86 (32 bit)
• Architecture of the library: x86 (32 bit)

When I added the library SolidWorks.Interop.sldworks.dll into my project references, through Visual Studio, there wasn't the CLSID

{27526253-6119-4B38-A1F9-2DC877E72334}

into the Windows registry, so I tried to register that library in these ways:

1. • Pasted SolidWorks.Interop.sldworks.dll into directory C:\Windows\SysWOW64
   • Ran Command Prompt as Administrator, than typed C:\Windows\SysWOW64>regsvr32 C:\Windows\SysWOW64\SolidWorks.Interop.sldworks.dll
   • Pressed Enter
   • Read this message:

The module C:\Windows\SysWOW64\SolidWorks.Interop.sldworks.dll was loaded but the call to DllRegisterServer failed...

So, the library was not registered.

2. • Pasted SolidWorks.Interop.sldworks.dll into the directory C:\Windows\Microsoft.NET\Framework\v4.0.30319
   • Ran Command Prompt as Administrator, than typed C:\Windows\Microsoft.NET\Framework\v4.0.30319>regasm SolidWorks.Interop.sldworks.dll
   • Pressed Enter
   • Read this message:

The types were registered.

So, I think, now the library is registered, in fact I see the CLSID

{27526253-6119-4B38-A1F9-2DC877E72334}

into the Windows registry.

The problem, however, persists.

3. In my C# code I created a new Guid; this is the code:

   using System;
   using System.Diagnostics;
   using System.Windows.Forms;
   using SolidWorks.Interop.sldworks;
   
   namespace CreateModelSW
   {
   public partial class Form1 : Form
   {
       public Form1()
       {
           InitializeComponent();
       }
   
       //Create interface
       SldWorks swApp;
   
       private void buttonCreateModel_Click(object sender, EventArgs e)
       {
           //Kill Solidworks processes
           Process[] processes = Process.GetProcessesByName("SLDWORKS");
           foreach (Process process in processes)
           {
               process.CloseMainWindow();
               process.Kill();
           }
   
           //Create new GUID
           Guid myGuid1 = new Guid("27526253-6119-4B38-A1F9-2DC877E72334");
           object processSW = System.Activator.CreateInstance(System.Type.GetTypeFromCLSID(myGuid1));
   
           //Create new SOLIDWORKS Part
           swApp = (SldWorks)processSW;
           swApp.Visible = true;
           swApp.NewPart();
       }
   }
   }
   

The problem persists.

Can you please help me? Thanks.

Answer 1

You should be using version agnostic progId, try this :

SldWorks swApp = (SldWorks)Activator.CreateInstance(System.Type.GetTypeFromProgID("SldWorks.Application"));