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.NET Forum / Languages / Managed C++ / November 2006Consuming VB.NET DLL in VC++.NET
Hi, I'm sure this is a question that comes up reasonably regularly, but I'm getting an error with the forum search function at the moment, and haven't found anything with a browse, so forgive me if this is repeating things!! Should also clarify that it's a VERY long time since I've done much C++, so I may well have forgotten something simple... I have a VB.NET dll that I'd like to be able to use in a VC++.NET application (all using VS.NET 2003). all the documentation I've found suggests that all I need to do is to copy the DLL into an output folder and tell the compiler to look in that folder to resolve #using directives, then add a #using "VBFunctions.dll" into my cpp file. Following that, I should be able to create an instance of this class and happily use it. I've tried this with: VBFunctions *oFunctions = new VBFunctions(); But I get a "VBFunctions : undeclared identifier" when trying to build the solution. Any help is gratefully received! Thanks Simon > I have a VB.NET dll that I'd like to be able to use in a VC++.NET > application (all using VS.NET 2003). all the documentation I've found [quoted text clipped - 3 lines] > then > add a #using "VBFunctions.dll" into my cpp file. Is your VC++ application native or managed - i.e. does it target Win32 or .Net? A simple procedure such as you sketched should work in the latter case. If though, you have a Win32 caller and a .Net callee, there is more work to do. I sketch a method for doing that here: http://groups.google.com/group/microsoft.public.dotnet.languages.vc/browse_frm/t hread/6bfd1115e804cc58/4f1afe6d2e0f0113?lnk=st&q=&rnum=2&hl=en#4f1afe6d2e0f0113 (My sample uses a C# callee but that doesn't matter) Regards, Will > > I have a VB.NET dll that I'd like to be able to use in a VC++.NET > > application (all using VS.NET 2003). all the documentation I've found [quoted text clipped - 17 lines] > Regards, > Will I was under the impression that the app was targeting .net, but it's a third party project template that I'm not too familiar with. Given that just importing the DLL hasn't worked, I'll try the interop services method you have linked to; I'm out of other ideas, so why not! Thanks for your help. Si OK. So I've done this and I now get a message "A namespace with this name does not exist" I've checked the registry after the regasm bits and pieces, and I've spelt the namespace right in the cpp. The only thing I couldn't do from your example was the [ClassInterface] bit; I can't find any reference to this in VB.net > I was under the impression that the app was targeting .net, but it's a > third > party project template that I'm not too familiar with. Given that just > importing the DLL hasn't worked, I'll try the interop services method you > have linked to; I'm out of other ideas, so why not! Well, the sample wo which I pointed to is for interoperating between the Win32 and .Net platforms. If you are targetting .Net in the pieces written in C++, my sample is beside the point. If you are not sure what you have you can inspect the switches on the compiler and linker command lines. If you are compiling with /clr and linking against mscoree.lib than you are targetting .Net Regards, Will > > I was under the impression that the app was targeting .net, but it's a > > third [quoted text clipped - 12 lines] > Regards, > Will The C++ parts are targeting Win32, so the sample is valid. I still can't get it to work, though. I've checked the registry and I'm using the correct class names and files, but whatever I do I get a "undeclared identifier" error when I try to reference anything using the class name. > Hi, > [quoted text clipped - 21 lines] > But I get a "VBFunctions : undeclared identifier" when trying to build the > solution. You will also need a using namespace statement. Get .NET Reflector (http://www.aisto.com/roeder/dotnet/) in order to find out the exact names available inside your VB assembly. > Any help is gratefully received! > > Thanks > > Simon Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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