Created a Com component but how to use it from DXL

Hi all,

I have created my own Com component which I want to use in DXL e.g. as

oleCreateAutoObject("TFSCOMLibrary.TFSComClass")

I do not now much of Com - my component is just a wrapper - but my code looks like below. Before I can use the com component I assume I have to do some configration.

1. Do I have to register the Com component and how?

2. Do I have put the Com dll in some specific directory?

using System;

using System.Runtime.InteropServices;

using System.IO;

using System.Text;

using System.Data.SqlClient;

using TFSLibrary;

namespace TFSCOMLibrary

{

[Guid("081caf54-89d8-4ae9-b224-c6fd5ca329b7")]

[ComVisible(true)]

public interface ITfscomInterface

{

[DispId(1)]

bool ReadTask(int doorsProxyId, out string state);

[DispId(2)]

bool FetchTask(int doorsProxyId);

}

[Guid("00f5a31a-67cd-4c3c-a211-fded09eb8276"),

InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]

public interface ITfsComEvents

{

}

[Guid("28dc8a68-bc10-4f50-b226-89a0bf650233"),

ClassInterface(ClassInterfaceType.None),

ComSourceInterfaces(typeof(ITfsComEvents))]

[ComVisible(true)]

public class TfsComClass : ITfscomInterface

{

private TfsLibrary _tfsLibrary;

public TfsComClass()

{

_tfsLibrary = new TfsLibrary();

}

public bool ReadTask(int doorsProxyId, out string state)

{

return _tfsLibrary.ReadTask(doorsProxyId, out state);

}

public bool FetchTask(int doorsProxyId)

{

return _tfsLibrary.FetchTask(doorsProxyId);

}

jukkaaakula - Thu May 21 03:26:39 EDT 2015

Re: Created a Com component but how to use it from DXL
Mathias Mamsch - Mon May 25 05:09:47 EDT 2015

This is not a DXL question - you need to register your COM object to be able to use it from DXL. For this you use the regsvr tool:

https://msdn.microsoft.com/en-us/library/ms859484.aspx

Search MSDN for more informations on that one. Regards, Mathias

Re: Created a Com component but how to use it from DXL
jukkaaakula - Mon May 25 09:08:53 EDT 2015

Mathias Mamsch - Mon May 25 05:09:47 EDT 2015

This is not a DXL question - you need to register your COM object to be able to use it from DXL. For this you use the regsvr tool:

https://msdn.microsoft.com/en-us/library/ms859484.aspx

Search MSDN for more informations on that one. Regards, Mathias

Thank you! Your proposal moved me much forward:

Now I tried regsvr32 as proposed in the link you gave - but it gave an error. Then I followed following guideleine:

"... if this isn't a hard-named/certificate created DLL (i.e. for pushing into the global assembly cache):

1) Use regasm with the /tlb option, example: regasm mydll.dll /tlb:mydll.tlb
2) Push the dll into the working directory of the executable. If in design mode, this will be where the VB6.EXE is located (default is like C:\Program Files\Microsoft Visual Studio\VB98). For compiled executables, just drop it in the same directory as the executable or where you launch if you launch with a shortcut."

https://social.msdn.microsoft.com/Forums/en-US/d5c5ff4a-63d3-49ea-a20d-50ef45924b2e/dllregisterserver-entry-point-was-not-found?forum=vbinterop

Thus I used

regasm TFSCOMLibrary.tlb.dll /tlb=TFSCOMLibrary.tlb

where TFSCOMLibrary.dll is my dll.

Then I moved the dll and tlb in the same directory as where the dxl is. However oleCreateAutoObject still returns null

batchTaskObject=oleCreateAutoObject("TFSCOMLibrary.TfsComClass")

Re: Created a Com component but how to use it from DXL
jukkaaakula - Tue May 26 02:45:07 EDT 2015

jukkaaakula - Mon May 25 09:08:53 EDT 2015