Convert array<String^>^ to std::vector<std::string>

Question

How can I convert a managed array<String^>^ to std::vector<std::string>. The following code doesnt compile and I can't figure out why. Funny enough, if I use an int for example then it works fine. thanks in advance:

std::vector<std::string> ConvertToUnManaged(array<String^>^ ar)
{
    using System::IntPtr;
    using System::Runtime::InteropServices::Marshal;

    std::vector<std::string> vector(ar->Length);
    Marshal::Copy(ar, 0, IntPtr(&vector[0]), ar->Length);

    return vector;
}

Why not simply write a loop to do this? That Marshall::Copy seems like overkill to me. — PaulMcKenzie
– PaulMcKenzie, Commented Aug 1, 2014 at 3:49

NetVipeC · Accepted Answer · 2014-08-01 04:13:16Z

3

There is no overload of Marshall::Copy with array of String parameter.

Iterating over the array element and converting one-by-one work.

#include <msclr/marshal_cppstd.h>

std::vector<std::string> ConvertToUnManaged(array<String^>^ ar)
{
    std::vector<std::string> vector(ar->Length);
    for (int i = 0; i < ar->Length; ++i) {
        auto s = ar[i];
        vector[i] = msclr::interop::marshal_as<std::string>(s);
    }
    return vector;
}

answered Aug 1, 2014 at 4:13

NetVipeC

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1 Comment

user2535425 Over a year ago

Thank you NetVipC. If you read my question before, nevermind, I figured it out it was a syntax error

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