C++ declaring a managed variable in a native code

Question

I have a .NET form, and a native code in my Visual Studio. The problem is: I can't declare a global instance of my .NET form in my native code, like this:

Editor^ maineditor;

It gives me this problem:

error C3145: 'EditorEntry' : global or static variable may not have managed type 'Cube3D::Editor ^'

The MSDN article for C3145 documents this error well. And also gives the workaround, make it a static member of ref class. — Hans Passant
– Hans Passant, Commented Jul 10, 2012 at 18:23

JaredPar · Accepted Answer · 2012-07-10 18:38:52Z

15

Instead of using a global static try making it a static method in a container type

ref class ManagedGlobals { public: static Editor^ maineditor = nullptr; };

edited Jul 10, 2012 at 18:38

answered Jul 10, 2012 at 18:24

JaredPar

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4 Comments

Miguel P Over a year ago

THanks, but when i define editor, the second code this comes: a variable with static storage duration cannot have a handle or tracking reference type

Miguel P Over a year ago

And when compiling: 'editor' : global or static variable may not have managed type 'Cube3D::Editor ^'

JaredPar Over a year ago

@user1492812 oops, didn't realize that was an issue. Removed that part of the answer

Miguel P Over a year ago

Any ideas?, Im sorry for the misconception. EditorEntry was the previous name for my instance of the Editor, sorry about that :/

user2242746 · Accepted Answer · 2016-03-30 14:24:19Z

10

wrap the handle with a gcroot<> struct

gcroot<Editor^> maineditor;

answered Mar 30, 2016 at 14:24

user2242746

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1 Comment

Cameron Over a year ago

Works like a charm and cleaner than creating a dummy wrapper class :-)

Community · Accepted Answer · 2017-05-23 12:00:25Z

You have your static class up top (referece: Can a class be declared static in c++?)

ref class ManagedGlobals abstract sealed { public: static Excel::Application^ xl; };

Now just reference that class

ManagedGlobals::xl = gcnew Excel::Application();

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