转换数组 <String^> ^转换为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;
}

Answer 1

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;
}