Marshal.SecureStringToCoTaskMemUnicode(SecureString) Metodo

public:
 static IntPtr SecureStringToCoTaskMemUnicode(System::Security::SecureString ^ s);

public static IntPtr SecureStringToCoTaskMemUnicode (System.Security.SecureString s);

[System.CLSCompliant(false)]
public static IntPtr SecureStringToCoTaskMemUnicode (System.Security.SecureString s);

[System.Security.SecurityCritical]
public static IntPtr SecureStringToCoTaskMemUnicode (System.Security.SecureString s);

static member SecureStringToCoTaskMemUnicode : System.Security.SecureString -> nativeint

[<System.CLSCompliant(false)>]
static member SecureStringToCoTaskMemUnicode : System.Security.SecureString -> nativeint

[<System.Security.SecurityCritical>]
static member SecureStringToCoTaskMemUnicode : System.Security.SecureString -> nativeint

Public Shared Function SecureStringToCoTaskMemUnicode (s As SecureString) As IntPtr

Parametri

Restituisce

Indirizzo, nella memoria non gestita, in cui è stato copiato il parametro s, oppure 0 se è stato fornito un oggetto Null.

Attributi

CLSCompliantAttribute SecurityCriticalAttribute

Eccezioni

Esempio

Nell'esempio seguente viene usato il metodo per eseguire il marshalling e decrittografare il SecureStringToCoTaskMemUnicode contenuto di un SecureString oggetto in un blocco di memoria non gestita. Usa quindi il metodo per zero e elimina il ZeroFreeCoTaskMemUnicode blocco non gestito.

using System;
using System.Runtime.InteropServices;
using System.Security;

class Example
{
    static void Main()
    {
        IntPtr unmanagedRef = IntPtr.Zero;
        // Ask the user for a password.
        Console.Write("Please enter your password: ");
        SecureString passWord = GetPassword();

        Console.WriteLine("Copying and decrypting the string to unmanaged memory...");
        // Copy the Secure string to unmanaged memory (and decrypt it).
        unmanagedRef = Marshal.SecureStringToCoTaskMemUnicode(passWord);
        passWord.Dispose();

        if (unmanagedRef != IntPtr.Zero) {
            Console.WriteLine("Zeroing out unmanaged memory...");
            Marshal.ZeroFreeCoTaskMemUnicode(unmanagedRef);
        }
        Console.WriteLine("Done.");
    }

    public static SecureString GetPassword()
    {
        SecureString password = new SecureString();

        // get the first character of the password
        ConsoleKeyInfo nextKey = Console.ReadKey(true);
        while (nextKey.Key != ConsoleKey.Enter) {
            if (nextKey.Key == ConsoleKey.Backspace) {
                if (password.Length > 0) {
                    password.RemoveAt(password.Length - 1);

                    // erase the last * as well
                    Console.Write(nextKey.KeyChar);
                    Console.Write(" ");
                    Console.Write(nextKey.KeyChar);
                }
            }
            else {
                password.AppendChar(nextKey.KeyChar);
                Console.Write("*");
            }

            nextKey = Console.ReadKey(true);
        }

         Console.WriteLine();

         // Lock the password down.
         password.MakeReadOnly();
         return password;
     }
 }
// The example displays output like the following:
//       Please enter your password: **********
//       Copying and decrypting the string to unmanaged memory...
//       Zeroing out unmanaged memory...
//       Done.

Imports System.Runtime.InteropServices
Imports System.Security

Module Example
    Public Sub Main()
        Dim unmanagedRef As IntPtr
        ' Ask the user for a password.
        Console.Write("Please enter your password: ")
        Dim passWord As SecureString = GetPassword()

        Console.WriteLine("Copying and decrypting the string to unmanaged memory...")
        ' Copy the Secure string to unmanaged memory (and decrypt it).
        unmanagedRef = Marshal.SecureStringToCoTaskMemUnicode(passWord)
        passWord.Dispose()

        If unmanagedRef <> IntPtr.Size Then
            Console.WriteLine("Zeroing out unmanaged memory...")
            Marshal.ZeroFreeCoTaskMemUnicode(unmanagedRef)
        End If
        Console.WriteLine("Done.")
    End Sub

    Function GetPassword() As SecureString
        Dim password As New SecureString()

        ' Get the first character of the password.
        Dim nextKey As ConsoleKeyInfo = Console.ReadKey(True)
        While nextKey.Key <> ConsoleKey.Enter
            If nextKey.Key = ConsoleKey.BackSpace Then
                If password.Length > 0 Then
                    password.RemoveAt(password.Length - 1)

                    ' Erase the last * as well.
                    Console.Write(nextKey.KeyChar)
                    Console.Write(" ")
                    Console.Write(nextKey.KeyChar)
                End If
            Else
                password.AppendChar(nextKey.KeyChar)
                Console.Write("*")
            End If

            nextKey = Console.ReadKey(True)
        End While
        Console.WriteLine()

        ' lock the password down
        password.MakeReadOnly()
        Return password
    End Function
End Module
' The example displays output like the following:
'       Please enter your password: **********
'       Copying and decrypting the string to unmanaged memory...
'       Zeroing out unmanaged memory...
'       Done.

Commenti

Il SecureStringToCoTaskMemUnicode metodo è utile per il marshalling personalizzato o quando si combina codice gestito e non gestito. Poiché questo metodo alloca la memoria non gestita necessaria per una stringa, libera sempre la memoria chiamando il ZeroFreeCoTaskMemUnicode metodo . I caratteri della stringa vengono copiati come caratteri Unicode.

Si applica a