Is there a way to have them in the same assembly?
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C++/CLI (.NET Classes) with C++ native classes
I have a CLR project with both .net classes and native C++ classes.
How can I get the native C++ classes to be visible in .net or to even create an instance of a native C++ class in .Net C++ class.
Thanks
Adam
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Answers
I chose a CLR C++ project which is C++ on the .net framework, but has the ability to use both native and .net classes. I have this working, I now want to interact with native and .net in the same assembly.
I would assume this is possible as I can find references to load a .net class in native classes, I just can't find examples on how to load a native C++ class from a .Net Class.
You can call unmanaged code directly from C# using DllImport attribute.
http://www.csharphelp.com/
I don't know if this helps but below is a mix of managed and unmanaged code mixed together...
#include "stdafx.h"
using namespace System;
// Unmanaged class
class fooUnManaged
{
public:
void bar() {}
};
// Managed class
__gc class fooManaged
{
public:
void bar() {}
};
int main()
{
fooUnManaged *pUnManaged = new fooUnManaged;
fooManaged *pManaged = new fooManaged;
pUnManaged->bar();
pManaged->bar();
// It is necessary to delete unmanaged type
delete pUnManaged;
// It is NOT necessary to delete unmanaged type
//delete pManaged;
return 0;
}
Hi Evilrix
The last solution was the exact one I was looking for, after search the net for weeks with no solution I finally stumbled across the solution myself by playing around with the code. I only discovered this about 12 hrs ago and even did a quick writeup for anyone wanting a more detailled step by step guide.
http://www.dotnetcore.com/
Thanks Evilrix
You're welcome. Just one additional thing to note...
when heap allocating an unmanaged class you really should consider using the RAII idiom and use a smart pointer container to avoid potential memory leaks. The STL comes with auto_ptr, which can be used; although this has issues since it is not reference counted, rather it uses move semmantics. I would strongly recommend looking at boost shared_ptr.
http://www.boost.org/libs/
Consider...
void bar()
{
// Using RAII to avoid memory leaks
boost::shared_ptr<int> pN = new int;
// Call a function that can throw
FnMayThrow();
// pN is ALWAYS released
}
void foo()
{
// Using raw pointer -- imposible to avoid leaks
int * pN = new int;
// Call a function that can throw
FnMayThrow();
// May never get called
delete pN;
}
-Rx.
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by: lucky_jamesPosted on 2007-10-21 at 23:38:33ID: 20121152
For this you should keep c++ classes in a seperate assembly and .net ones in other.
make c++ dll a COM one.
Then reference it from .net dll.
Now you can use classes as cppdll.classname
Hope it helps.