Re: Enum between Managed C++ and C#

[Jay B. Harlow [MVP - Outlook]]

Drew,
If you make the enum public __value in your managed C++, it will be usable
in your C# code.

Something like:

public __value enum MyEnum
{
Value1 = 1,
Value2 = 2
};

The __value says that it is a managed type

Hope this helps
Jay

 

[Jay B. Harlow [MVP - Outlook]]

Drew,

Thanks Jay for the response. However, I want to prevent redefining my
enums. To go into more detail, here is the layout of my files.

Isn't this like wanting your cake and eating to?

Are you saying that :

namespace ManagedClassLibrary
{
public __value enum BaseUnit

{
evBaseUnit1,
evBaseUnit2
};

public class __gc ManagedClass
{
void Open(BaseUnit eBaseUnit)
{
}
};

}

That Open does not show the enums for you in C#? I do the preceding in my
VB.NET/C++ project and I see the enums. I do not use a #define to hide the
__value. Remember the enum in C# is going to be prefixed with the namespace
you put them in. You did put them in a namespace? You also need to include
public.

I was going to suggest trying to use a #define to include or exclude the
__value from the enum, then cast as needed in your managed C++ wrapper. I
think first its best to make sure you see enums. Then worry about redefining
them...

Hope this helps
Jay

Thanks Jay for the response. However, I want to prevent redefining my
enums. To go into more detail, here is the layout of my files.

baseunits.h
===========
enum BaseUnit
{
evBaseUnit1,
evBaseUnit2
};

managed.cpp
===========

#include "baseunits.h"

class __gc ManagedClass
{
void Open(BaseUnit eBaseUnit)
{
}
};

csharp.cs
=========

ManagedClass mc;
mc.Open(int eBaseUnit); // This shows up as an integer

I can redefine a managed enum using public __value and just cast to
the native enum, but I do not want to redefine the enums. I've even
tried adding:

#ifdef DOTNET
public __value
#endif

to my baseunits.h, and defined DOTNET in my managed wrapper, but I
still cant see it in my csharp project.

Thanks,
Drew
"Jay B. Harlow [MVP - Outlook]" <[email protected]> wrote in

Drew,
If you make the enum public __value in your managed C++, it will be usable
in your C# code.

Something like:

public __value enum MyEnum
{
Value1 = 1,
Value2 = 2
};

The __value says that it is a managed type

Hope this helps
Jay

 

[Drew]

I love wanting my cake and eating it at the same time!

To clarify, if I create a new set of enums (e.g. ManagedBaseUnit), I
can see them from C#. And as a matter of fact, casting the managed to
my unmanaged enums is exactly what I am doing right now. That works
fine. However, now I am maintaining two sets of enums. I've tried
everything I can think of to eliminate the second set of enums, but
it's not working. My enums are already in a namespace for my current
native C++ app.

Thanks for taking the time to help me out.

-Drew

Drew,

Thanks Jay for the response. However, I want to prevent redefining my
enums. To go into more detail, here is the layout of my files.

Isn't this like wanting your cake and eating to?

Are you saying that :

namespace ManagedClassLibrary
{
public __value enum BaseUnit

{
evBaseUnit1,
evBaseUnit2
};

public class __gc ManagedClass
{
void Open(BaseUnit eBaseUnit)
{
}
};

}

That Open does not show the enums for you in C#? I do the preceding in my
VB.NET/C++ project and I see the enums. I do not use a #define to hide the
__value. Remember the enum in C# is going to be prefixed with the namespace
you put them in. You did put them in a namespace? You also need to include
public.

I was going to suggest trying to use a #define to include or exclude the
__value from the enum, then cast as needed in your managed C++ wrapper. I
think first its best to make sure you see enums. Then worry about redefining
them...

Hope this helps
Jay

Thanks Jay for the response. However, I want to prevent redefining my
enums. To go into more detail, here is the layout of my files.

baseunits.h
===========
enum BaseUnit
{
evBaseUnit1,
evBaseUnit2
};

managed.cpp
===========

#include "baseunits.h"

class __gc ManagedClass
{
void Open(BaseUnit eBaseUnit)
{
}
};

csharp.cs
=========

ManagedClass mc;
mc.Open(int eBaseUnit); // This shows up as an integer

I can redefine a managed enum using public __value and just cast to
the native enum, but I do not want to redefine the enums. I've even
tried adding:

#ifdef DOTNET
public __value
#endif

to my baseunits.h, and defined DOTNET in my managed wrapper, but I
still cant see it in my csharp project.

Thanks,
Drew
"Jay B. Harlow [MVP - Outlook]" <[email protected]> wrote in

Drew,
If you make the enum public __value in your managed C++, it will be usable
in your C# code.

Something like:

public __value enum MyEnum
{
Value1 = 1,
Value2 = 2
};

The __value says that it is a managed type

Hope this helps
Jay

I have an enum that I use throughout my native C++ code. Of course
when I use this enum in my managed C++ wrapper, everything is fine.
However, now I would like to use this enum in my C# code which calls
my managed C++ wrapper. Any ideas how? I don't want to have to copies
of my enum floating around (one for managed and one for unmanaged). I
also know the code will work just by passing in the appropriate
integer into my managed C++ class, but that's not good for users of my
managed C++ wrapper API.

Thanks,
Drew

 

[Jay B. Harlow [MVP - Outlook]]

Drew,
Its been a busy week...

I'm not sure what to offer, other than try to get the #include with #define
DOTNET __value working.

When you do the #include w/#define, is the #include in a namespace?

Hope this helps
Jay

I love wanting my cake and eating it at the same time!

To clarify, if I create a new set of enums (e.g. ManagedBaseUnit), I
can see them from C#. And as a matter of fact, casting the managed to
my unmanaged enums is exactly what I am doing right now. That works
fine. However, now I am maintaining two sets of enums. I've tried
everything I can think of to eliminate the second set of enums, but
it's not working. My enums are already in a namespace for my current
native C++ app.

Thanks for taking the time to help me out.

-Drew

"Jay B. Harlow [MVP - Outlook]" <[email protected]> wrote in

Drew,

Thanks Jay for the response. However, I want to prevent redefining my
enums. To go into more detail, here is the layout of my files.

Isn't this like wanting your cake and eating to?

Are you saying that :

namespace ManagedClassLibrary
{
public __value enum BaseUnit

{
evBaseUnit1,
evBaseUnit2
};

public class __gc ManagedClass
{
void Open(BaseUnit eBaseUnit)
{
}
};

}

That Open does not show the enums for you in C#? I do the preceding in my
VB.NET/C++ project and I see the enums. I do not use a #define to hide the
__value. Remember the enum in C# is going to be prefixed with the namespace
you put them in. You did put them in a namespace? You also need to include
public.

I was going to suggest trying to use a #define to include or exclude the
__value from the enum, then cast as needed in your managed C++ wrapper. I
think first its best to make sure you see enums. Then worry about redefining
them...

Hope this helps
Jay

Thanks Jay for the response. However, I want to prevent redefining my
enums. To go into more detail, here is the layout of my files.

baseunits.h
===========
enum BaseUnit
{
evBaseUnit1,
evBaseUnit2
};

managed.cpp
===========

#include "baseunits.h"

class __gc ManagedClass
{
void Open(BaseUnit eBaseUnit)
{
}
};

csharp.cs
=========

ManagedClass mc;
mc.Open(int eBaseUnit); // This shows up as an integer

I can redefine a managed enum using public __value and just cast to
the native enum, but I do not want to redefine the enums. I've even
tried adding:

#ifdef DOTNET
public __value
#endif

to my baseunits.h, and defined DOTNET in my managed wrapper, but I
still cant see it in my csharp project.

Thanks,
Drew
"Jay B. Harlow [MVP - Outlook]" <[email protected]> wrote in

Drew,
If you make the enum public __value in your managed C++, it will be usable
in your C# code.

Something like:

public __value enum MyEnum
{
Value1 = 1,
Value2 = 2
};

The __value says that it is a managed type

Hope this helps
Jay

I have an enum that I use throughout my native C++ code. Of course
when I use this enum in my managed C++ wrapper, everything is fine.
However, now I would like to use this enum in my C# code which calls
my managed C++ wrapper. Any ideas how? I don't want to have to copies
of my enum floating around (one for managed and one for unmanaged). I
also know the code will work just by passing in the appropriate
integer into my managed C++ class, but that's not good for users of my
managed C++ wrapper API.

Thanks,
Drew

 

[Brandon Bray [MSFT]]

I'm not sure what to offer, other than try to get the #include with
#define DOTNET __value working.

The only thing I would change is using the _MANAGED macro instead of DOTNET.
The compiler will define _MANAGED when compiling /clr in managed regions.

Other than that, I would need to know more details than that to help. I can
say that in future versions of Visual C++, we will solve this problem. I
know that's not much help now, but at least I know the pain here.

Cheerio!