However, when I build the client I get the following errors:
error C2146: syntax error : missing ';' before identifier 'GetType' error C2501: 'CommsServer::_UserDatagramProtocol::_TypePtr' : missing storage-class or type specifiers warning C4183: 'GetType': missing return type; assumed to be a member function returning 'int' error C2143: syntax error : missing ';' before 'CommsServer::_UserDatagramProtocol::GetType' error C2433: '_TypePtr' : 'inline' not permitted on data declarations error C2501: '_TypePtr' : missing storage-class or type specifiers error C2064: term does not evaluate to a function taking 2 arguments
I tried creating the object in VB6 as well, but that doesn't work either.
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As you are (rightly) suppressing the class interface, you need to supply an explicit interface for COM to use. Thus, something like:
[assembly:ComVisible(true)]
[Guid(...)] public interface ICommsServer { ... }
[ClassInterface(ClassInterfaceType.None)] public class CommsServer : ICommsServer { ... }
I'm not sure if this is actually the cause of your problem, but it's something I think you'll need to be aware of.
If adding the explicit interface doesn't help, it might be worth having a look in the generated TLH and TLI files and see if anything you'd expect to see (e.g. GUIDs, class/interface names, etc.) is obviously missing.
Hope this helps,
-- Ivan Towlson White Carbon
-----Original Message----- From: Discussion relating to the specifics of the C# and Managed C++ languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM]On Behalf Of Paul Grenyer Sent: 12 May 2004 13:46 To: DOTNET-CX@DISCUSS.DEVELOP.COM Subject: [DOTNET-CX] Creating COM components in C#
I want to create a C# dll that is available to COM aware clients. I've followed the example in Inside C# (2nd Ed) and have the following:
It gives me the error message "Class Not Registered". My tlh looks like this:
// Created by Microsoft (R) C/C++ Compiler Version 13.10.3077 (2fb42baa). // // c:\temp\c#\commsserver\client\debug\commsserver.tlh // // C++ source equivalent of Win32 type library ..\bin\debug\CommsServer.tlb // compiler-generated file created 05/12/04 at 15:46:41 - DO NOT EDIT!
-----Original Message-----> From: Ivan Towlson [mailto:ivan.towlson@WHITE-CARBON.COM]> Sent: 12 May 2004 15:22> To: DOTNET-CX@DISCUSS.DEVELOP.COM> Subject: Re: [DOTNET-CX] Creating COM components in C#>
As you are (rightly) suppressing the class interface, you> need to supply> an explicit interface for COM to use. Thus, something like:>
[assembly:ComVisible(true)]>
[Guid(...)]> public interface ICommsServer { ... }>
[ClassInterface(ClassInterfaceType.None)]> public class CommsServer : ICommsServer { ... }>
I'm not sure if this is actually the cause of your problem, but it's> something I think you'll need to be aware of.>
If adding the explicit interface doesn't help, it might be> worth having> a look in the generated TLH and TLI files and see if anything you'd> expect to see (e.g. GUIDs, class/interface names, etc.) is obviously> missing.>
Hope this helps,>
--> Ivan Towlson> White Carbon>
-----Original Message-----> From: Discussion relating to the specifics of the C# and Managed C++> languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM]On Behalf Of Paul> Grenyer> Sent: 12 May 2004 13:46> To: DOTNET-CX@DISCUSS.DEVELOP.COM> Subject: [DOTNET-CX] Creating COM components in C#>
I want to create a C# dll that is available to COM aware clients. I've> followed the example in Inside C# (2nd Ed) and have the following:>
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Have a look in the registry to see if the CLSID mentioned in the TLH is>registered. If not, you may need to make the class ComVisible and>re-regasm.>
Another possible issue is whether COM can actually find your assembly.>Your .NET assembly needs to be either in your app (EXE) directory or the>GAC. (Even though your class is registered as a COM component, it's>*not* globally accessible a la COM unless you put it in the GAC. The>registered COM handler for all .NET classes is mscoree.dll, not the .NET>assembly itself.)>
-->Ivan Towlson>White Carbon>
-----Original Message----->From: Discussion relating to the specifics of the C# and Managed C++>languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM]On Behalf Of Paul>Grenyer>Sent: 12 May 2004 14:44>To: DOTNET-CX@DISCUSS.DEVELOP.COM>Subject: Re: [DOTNET-CX] Creating COM components in C#>
namespace CommsServer>{> [ClassInterface(ClassInterfaceType.None)]> public class UserDatagramProtocol : IUserDatagramProtocol> {> }>}>
It gives me the error message "Class Not Registered". My tlh looks like>this:>
dont know if it will help, but when i was using some COM stuff, I had to use regsvcs.exe to register my dlls.
Have a look in the registry to see if the CLSID mentioned in the TLH is registered. If not, you may need to make the class ComVisible and re-regasm.
Another possible issue is whether COM can actually find your assembly. Your .NET assembly needs to be either in your app (EXE) directory or the GAC. (Even though your class is registered as a COM component, it's *not* globally accessible a la COM unless you put it in the GAC. The registered COM handler for all .NET classes is mscoree.dll, not the .NET assembly itself.)
-- Ivan Towlson White Carbon
-----Original Message----- From: Discussion relating to the specifics of the C# and Managed C++ languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM]On Behalf Of Paul Grenyer Sent: 12 May 2004 14:44 To: DOTNET-CX@DISCUSS.DEVELOP.COM Subject: Re: [DOTNET-CX] Creating COM components in C#
namespace CommsServer { [ClassInterface(ClassInterfaceType.None)] public class UserDatagramProtocol : IUserDatagramProtocol { } }
It gives me the error message "Class Not Registered". My tlh looks like this:
Make sure that you use the /codebase option when you use regasm. Your COM components will not be able to see it otherwise.
Example:
regasm /codebase MyComInterop.dll
Cheers, Rocco Martin Corillian
-----Original Message----- From: Discussion relating to the specifics of the C# and Managed C++ languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM] On Behalf Of Sean Chapman Sent: Wednesday, May 12, 2004 7:59 AM To: DOTNET-CX@DISCUSS.DEVELOP.COM Subject: Re: [DOTNET-CX] Creating COM components in C#
Ivan Towlson wrote:
Have a look in the registry to see if the CLSID mentioned in the TLH is>registered. If not, you may need to make the class ComVisible and>re-regasm.>
Another possible issue is whether COM can actually find your assembly.>Your .NET assembly needs to be either in your app (EXE) directory or
GAC. (Even though your class is registered as a COM component, it's>*not* globally accessible a la COM unless you put it in the GAC. The>registered COM handler for all .NET classes is mscoree.dll, not the
.NET>assembly itself.)>
-->Ivan Towlson>White Carbon>
-----Original Message----->From: Discussion relating to the specifics of the C# and Managed C++>languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM]On Behalf Of Paul>Grenyer>Sent: 12 May 2004 14:44>To: DOTNET-CX@DISCUSS.DEVELOP.COM>Subject: Re: [DOTNET-CX] Creating COM components in C#>
namespace CommsServer>{> [ClassInterface(ClassInterfaceType.None)]> public class UserDatagramProtocol : IUserDatagramProtocol> {> }>}>
It gives me the error message "Class Not Registered". My tlh looks like>this:>
dont know if it will help, but when i was using some COM stuff, I had to use regsvcs.exe to register my dlls.
[ComVisible(true)] [Guid("144B64C7-DA04-45ba-A61F-C8954627ADAA")] [ClassInterface(ClassInterfaceType.None)] public class UserDatagramProtocol : IUserDatagramProtocol {
....
Rebuilt the DLL and then rebuilt the type library. Still "Class not registered".
Another possible issue is whether COM can actually find your assembly.> Your .NET assembly needs to be either in your app (EXE)> directory or the> GAC. (Even though your class is registered as a COM component, it's> *not* globally accessible a la COM unless you put it in the GAC. The> registered COM handler for all .NET classes is mscoree.dll,> not the .NET> assembly itself.)
That was it! I needed to put the C# dll in the same directory as my client executable. Thanks!
I now need to investigate the GAC as this component I am writing is for use with SQL server.
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Check the assemblyinfo.cs file, tight at the bottom, it's always there
-----Original Message----- From: Paul Grenyer [mailtoaul.Grenyer@COMMUNISIS-DM.CO.UK] Sent: 13 May 2004 09:30 AM To: DOTNET-CX@DISCUSS.DEVELOP.COM Subject: Re: [DOTNET-CX] Creating COM components in C#
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All
It appears I have fallen at the next hurdle...
I have tried to register my c# dll in the Global Assembly Cash with gacutil.exe. which gives me the following error message:
Failure adding assembly to the cache: Attempt to install an assembly without a strong name
A quick investigation of MSDN and C# Programming by Jesse Liberty suggest that I can give my c# dll a strong name using the sn tool:
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-----Original Message-----> From: Discussion relating to the specifics of the C# and > Managed C++ languages [mailtoOTNET-CX@DISCUSS.DEVELOP.COM] > On Behalf Of Paul Grenyer> Sent: Donnerstag, 13. Mai 2004 09:30> To: DOTNET-CX@DISCUSS.DEVELOP.COM> Subject: Re: [DOTNET-CX] Creating COM components in C#>
*** Before acting on this e-mail or opening any attachment > you are advised to read the disclaimer at the end of this e-mail ***>
It appears I have fallen at the next hurdle...>
I have tried to register my c# dll in the Global Assembly > Cash with gacutil.exe. which gives me the following error message:>
Failure adding assembly to the cache: Attempt to install an > assembly without a strong name>
A quick investigation of MSDN and C# Programming by Jesse > Liberty suggest that I can give my c# dll a strong name using > the sn tool:>
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That was it! I needed to put the C# dll in the same directory> as my client> executable. Thanks!>
I now need to investigate the GAC as this component I am> writing is for use> with SQL server.
While the GAC is probably a better location for the assembly, realize that you can use the /codebase option in regasm.exe to specify the location of your assembly (thus eliminating the need for the GAC).
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Hi
While the GAC is probably a better location for the assembly,> realize that> you can use the /codebase option in regasm.exe to specify the> location of> your assembly (thus eliminating the need for the GAC).
That sounds like a better solution. I'll try it, thanks!
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