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.NET Forum / Languages / Managed C++ / November 2006int[,] array in C++?
Hello, I am failing to create appropriate array in C++ to pass to a C# method. The method looks like public Foo(int[,] data) {..} in C#. When I try to call it with an array initialized in C++ as: int inputArray[][2] = {{0, 0}, {0, 1}, {1, 0}, {1, 1}}; it fails. So what is the proper way to declare an equivalent of int[,] in C++? > I am failing to create appropriate array in C++ to pass to a C# method. > The method looks like [quoted text clipped - 6 lines] > it fails. So what is the proper way to declare an equivalent of int[,] > in C++? Well, the purists will wince when they read this but ... ... which C++ language are you talking about? :-) Arrays in C# are instances of the System::Array class. In MC++ (VS 2003), to create a managed array of integers you'd make the declaration Int32 inputArray[,] = new Int32[4,2]; and the compiler will do the right thing. Alternatively, you should be able to cook up something using Array::CreateInstance() I've not used C++/CLI (in VS 2005) much so I'm not all that familiar with the syntax using it. My guess is that new is replaced by gcnew in the line above but that is a WAG. As for ISO C++ - if you really want your C# code to see a managed array - I don't think it is an option though I could be wrong. Regards, Will > I've not used C++/CLI (in VS 2005) much so I'm not all that familiar with > the syntax using it. My guess is that new is replaced by gcnew in the line > above but that is a WAG. array<int, 2>^ arr = gcnew array<int, 2>(3, 4); Marcus In C++/CLI, you'd declare the array as: array<int, 2> ^foo; or (with value initialization): array<int, 2> ^foo = {{1,2}, {3,4}};  SignatureDavid Anton www.tangiblesoftwaresolutions.com Instant C#: VB to C# converter Instant VB: C# to VB converter Instant C++: C#/VB to C++ converter Instant Python: VB to Python converter > Hello, > I am failing to create appropriate array in C++ to pass to a C# method. [quoted text clipped - 7 lines] > it fails. So what is the proper way to declare an equivalent of int[,] > in C++? Thank Will and David, array<int, 2> ^foo = {{1,2}, {3,4}}; is what I needed! > Thank Will and David, > array<int, 2> ^foo = {{1,2}, {3,4}}; is what I needed! It's a good thing that thanks aren't necessary because Marcus (who deserved one) didn't get one and I (who didn't deserve one because I offered a VS2003 solution) got one. :-) Seriously, the thing that you should take away from this exchange is that unlike the native case where arrays are simply "objects" layed out sequentially in memory where the "next" storage location may or may not be what you expect, arrays are types in their own right in .Net in which the array's "size" is known. Regards, Will William DePalo [MVP VC++] schrieb: > > Thank Will and David, > > array<int, 2> ^foo = {{1,2}, {3,4}}; is what I needed! [quoted text clipped - 11 lines] > Regards, > Will Typing takes some time, I just overlooked Markus's answer :) Thanks to you too, Markus! By the way, I gave you the short-form value initialization, which is only valid in a declaration. Some people may prefer the long form, which is: array<int, 2> ^foo = gcnew array<int, 2>(2,2) {{1,2}, {3,4}}; SignatureDavid Anton www.tangiblesoftwaresolutions.com Instant C#: VB to C# converter Instant VB: C# to VB converter Instant C++: C#/VB to C++ converter Instant Python: VB to Python converter > Thank Will and David, > array<int, 2> ^foo = {{1,2}, {3,4}}; is what I needed! Thanks Will and David, array<int, 2> ^foo = {{1,2}, {3,4}}; is what I needed!
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