Преобразование между типами System::String, char*, wchar_t*, std::string и др.

#include <msclr/marshal.h>
using namespace System;
 
int main() {
    const char* text = "I will be a String!";
    String^ managed = msclr::interop::marshal_as<String^>(text);
    Console::WriteLine(managed);
    return 0;
}

#include <cstdio>
#include <msclr/marshal.h>
using namespace System;
using namespace msclr::interop;
 
int main() {
    String^ managed = "Transformed to const char*";
    marshal_context^ marshal = gcnew marshal_context();
    const char* native = marshal->marshal_as<const char*>(managed);
    puts(native);
    delete marshal;
    return 0;
}

#include <clocale>
#include <msclr/marshal.h>
using namespace System;
using namespace msclr::interop;
 
int main() {
    char* loc = setlocale(LC_ALL, NULL);
    String^ text = marshal_as<String^>(loc);
    Console::WriteLine(text);
    return 0;
}

#include <clocale>
#include <msclr/marshal.h>
using namespace System;
using namespace msclr::interop;
 
int main() {
    char* loc = setlocale(LC_ALL, NULL);
    String^ text = gcnew String(loc);
    Console::WriteLine(text);
    return 0;
}

#include <msclr/marshal.h>
#include <windows.h>
using namespace System;
using namespace msclr::interop;
 
int main() {
    marshal_context^ ctx = gcnew marshal_context();
 
    String^ now = DateTime::Now.ToString();
    MessageBox(NULL,
        ctx->marshal_as<const wchar_t*>(now),
        L"Now",
        MB_OK);
 
    delete ctx;
    return 0;
}

#include <algorithm>
#include <string>
#include <msclr/marshal_cppstd.h>
using namespace System;
using namespace msclr::interop;
 
int main() {
    std::wstring str = L"алукард";
    std::reverse(str.begin(), str.end());
    String^ text = marshal_as<String^>(str);
    Console::WriteLine(text);
    return 0;
}

#include <msclr/marshal_windows.h>
#include <windows.h>
using namespace System;
using namespace System::Diagnostics;
using namespace msclr::interop;
 
int main() {
    IntPtr managedHandle = Process::GetProcessesByName("explorer")[0]->Handle;
    HANDLE nativeHandle = marshal_as<HANDLE>(managedHandle);
    int count = 0;
    if (!(count = GetGuiResources(nativeHandle, GR_GDIOBJECTS)))
        Console::WriteLine("Something goes wrong with code #{0}", GetLastError());
    else
        Console::WriteLine("GDI objects: {0}", count);
    return 0;
}

using namespace System;
using namespace System::Runtime::InteropServices;
 
namespace MarshalledFuncs
{
    [DllImport("user32.dll",
        CharSet = CharSet::Unicode,
        EntryPoint = "MessageBoxW",
        ExactSpelling = true)]
    Int32 MessageBox(IntPtr hWnd, String^ lpText, String^ lpCaption, UInt32 uType);
}
 
int main() {
    String^ text = L"Привет, Мир!";
    String^ title = L"Сообщение";
    MarshalledFuncs::MessageBox(IntPtr::Zero, text, title, 0);
    return 0;
}