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参考: https://docs.microsoft.com/zh-cn/cpp/dotnet/overview-of-marshaling-in-cpp

#include "msclr/marshal.h"
#include "msclr/marshal_windows.h"
#include "msclr/marshal_cppstd.h"
#include "msclr/marshal_atl.h"

int main(cli::array<System::String ^> ^args)
{

    marshal_context^ context = gcnew marshal_context();

    DWFString s(context->marshal_as<const wchar_t *>(args[0]));

    System::String ^s2 = marshal_as<System::String^>((const wchar_t *)s);

}