I am trying to import a .dll file which is written in C to Microsoft Visual C# Studio 2010?
Any ideas why I keep on getting this error?
Please make sure that the file is accessible and that it is a valid assembly prompt.
You cannot import a reference to a native DLL. Instead you need to use p/invoke to import each function one by one. This can be a rather laborious process if you have a lot of functions so sometimes a C++/CLI wrapper is more convenient.
I suspect you're not using the DllImportAttribute correctly (or at all). See here:
http://msdn.microsoft.com/en-us/library/aa984739(v=vs.71).aspx
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I've been provided a DLL that has been written in C++. Along with the DLL I receive the required input parms and expected output as well as a .h include file.
Can't seem to get it included as a Reference in my project. My procedure is to right click References and Add Reference, click Browse and then double click on the DLL. The error I get is:
A reference to 'c:......\dll' could not be added. Please make sure
that the file is accessible, and that it is a valid assembly or COM
component.
The problem is likely due to the name mangling of C++, but I'm not sure how to overcome the problem. I've been told by the author of the DLL that it was written for another customer who ran into the same issue, but was eventually successful in getting it referenced. I don't have access to that 'customer' and was wondering if anyone had suggestions.
Adding a reference is not how you link to this unmanaged DLL from your C# code. Instead you need to either:
Translate the header file to C# p/invoke calls, or
Create a C++/CLI wrapper around the unmanaged DLL and add a reference to that from your C# project. This option would typically involve linking to the .lib import library for the DLL which should be supplied with the DLL.
I have to create a win32 python dll file which can used in C#.Net code.
And access the classes & functions present in the dll file through C#.
Is there any way to create a win32 python dll?
Please help me out....
You can compile your Python sources to a DLL with pyc.py, in the Samples directory of IronPython. However, you can't load this DLL from C# directly - you'll still need to host IronPython, but then you can reference the DLL with the IronPython engine and import from it.
Try do some investigation about Pyrex. I'm not sure if it will solve your issue, but at least I seen that some guys was trying to get it working.
You don't need any DLL, you just need to load your Python sources using IronPython
I am wondering how to use VAMP Plugins with C# for Visual Studio 2008? I have downloaded multiple VAMP Plugins already. Currently, I have tested them using Sonic Visualiser and it looks great! However, I am having some problems incorporating it to my C# program.
My problem is that whenever I try to reference the .dll file, it gives me an error, something about 'make sure you are referencing a valid assembly or COM object'. How do I get around this?
Thank you very much!
I think you mean these: http://www.vamp-plugins.org/
As far as I can see, they are written in C++, so you can't add them as reference. You need to use P/Invoke to use those plugins.
I'm trying to use the lame_enc.dll file from LAME in a C# project, but adding the thing seems impossible.
I keep getting an error that says that a reference could not be added and to please check if the is accessible, a valid assembly or COM component.
I have no C++ experience, though I would like to use the functionality. Right now I'm using Process from the .NET framework to call lame.exe and do stuff, but I'd like to know if there's another way.
You can only add managed assemblies as a reference to a managed project. What I normally do in this situation is to add it as ressource instead with "copy local" settings. That way the DLL is tied to and deployed with your project. I then use DllImport to manually get the APIs I need from that DLL.
You have to use P/Invoke to call unmanaged APIs from managed code.
To use an unmanaged dll (native C++) in C#, you have to use DllImport, not adding a reference to the project in visual studio (and that is why you get an error).
Here is the documentation of DllImport from the MSDN.
You will need to use PInvoke to call functions in your native lame dll. However, you will only be able to call functions that have been exported as "C" style.
You can use a tool like "PInvoke Interop Assistant" that will help you when working out the PInvoke call signatures to make calls from C# to your native dll:
http://clrinterop.codeplex.com/releases/view/14120
I am working on C# for a few mounths. Mainly I am working on C++.
On C++ using the visual studio if I wanted to add a a static library I could add it using the configuration of the project add the header and lib and path.
When using C#, I think it is something like DLL, all those assemblies are complied on late binding ?
In addition using the visual studio for the C# I can add a reference. Is this the equel thing as I wrote in the beginning of the question ? only for something like DLL ?
If your want use a Win32 DLL in C#, you must write a C# wrapper for it.
C# is managed, and everything you reference as an assembly gets linked at runtime, as with DLL's in C++. The compiler will check at compile time that you are using your assemblies properly, but it wont link them yet. You can use http://research.microsoft.com/en-us/people/mbarnett/ILMerge.aspx to merge assemblies together, as a post-build step.