Importing C++ dll into C#

[=?Utf-8?B?UGFycm90?=]

I have tried everything to import a C++ dll into a C# program without
success. I can import the dll into another C++ program but not a C# program.
I always get the message that it can't find the function in the specified
dll. So it is finding the dll program but it can't find the entry
statements. I know that in C++ environment a lib file is used for addressing
the entry statements at link time. Obviously, it does not work in a C#
environment since there are no linker variables. Does anyhow have an example
of importing a C++ dll into a C# program using the DLLexport function?
Dave

[Peter Duniho]

On Tue, 22 Jan 2008 18:26:00 -0800, Parrot
<Pa****@discussions.microsoft.comwrote:

[...] Does anyhow have an example
of importing a C++ dll into a C# program using the DLLexport function?

You need to look at the DllImport directive and "p/invoke" generally.
Searching for those terms in this newsgroup will turn up lots of existing
examples.

You may also want to look at this page:
http://msdn2.microsoft.com/en-us/library/aa288468.aspx (Platform Invoke
Tutorial)

Pete

[Michael C]

"Parrot" <Pa****@discussions.microsoft.comwrote in message
news:38**********************************@microsof t.com...

>I have tried everything to import a C++ dll into a C# program without
success. I can import the dll into another C++ program but not a C#
program.
I always get the message that it can't find the function in the specified
dll. So it is finding the dll program but it can't find the entry
statements. I know that in C++ environment a lib file is used for
addressing
the entry statements at link time. Obviously, it does not work in a C#
environment since there are no linker variables. Does anyhow have an
example
of importing a C++ dll into a C# program using the DLLexport function?
Dave

Here's an example. You just put this code somewhere in you C# project. This
is all you need, you don't add an import like you do for C++.
[DllImport("gdi32")]
private static extern int AbortDoc(int hdc);

You need to make sure your C++ dll doesn't mangle the function names it
exports and generally you should make then stdcall. To stop the mangling you
need to add a text file called Exports.DEF and add something like this

Exports
FirstFunctionNameNotToMangle
SecondFunctionNameNotToMangle
etc