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Marshal.SecureStringToCoTaskMemAnsi(SecureString) Metode

Definisi

Penting

API ini bukan kompatibel CLS.

Menyalin konten objek terkelola SecureString ke blok memori yang dialokasikan dari alokator tugas COM yang tidak dikelola.

public:
 static IntPtr SecureStringToCoTaskMemAnsi(System::Security::SecureString ^ s);
public static IntPtr SecureStringToCoTaskMemAnsi (System.Security.SecureString s);
[System.CLSCompliant(false)]
public static IntPtr SecureStringToCoTaskMemAnsi (System.Security.SecureString s);
[System.Security.SecurityCritical]
public static IntPtr SecureStringToCoTaskMemAnsi (System.Security.SecureString s);
static member SecureStringToCoTaskMemAnsi : System.Security.SecureString -> nativeint
[<System.CLSCompliant(false)>]
static member SecureStringToCoTaskMemAnsi : System.Security.SecureString -> nativeint
[<System.Security.SecurityCritical>]
static member SecureStringToCoTaskMemAnsi : System.Security.SecureString -> nativeint
Public Shared Function SecureStringToCoTaskMemAnsi (s As SecureString) As IntPtr

Parameter

s
SecureString

Objek terkelola untuk disalin.

Mengembalikan

IntPtr

nativeint

Alamat, dalam memori yang tidak dikelola, tempat s parameter disalin, atau 0 jika objek null disediakan.

Atribut

Pengecualian

Parameternya s adalah null.

Tidak tersedia cukup memori.

Contoh

Contoh berikut menggunakan SecureStringToCoTaskMemAnsi metode untuk marshal dan mendekripsi SecureString konten objek ke blok memori yang tidak dikelola. Kemudian menggunakan ZeroFreeCoTaskMemAnsi metode untuk nol keluar dan membuang blok yang tidak dikelola.

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

class MarshalExample
{
     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.SecureStringToCoTaskMemAnsi(passWord);

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

              Marshal.ZeroFreeCoTaskMemAnsi(unmanagedRef);
          }
          passWord.Dispose();

         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;
     }
}
Imports System.Runtime.InteropServices
Imports System.Security

Module Example
    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.SecureStringToCoTaskMemAnsi(passWord)

         If unmanagedRef <> IntPtr.Size Then
             Console.WriteLine("Zeroing out unmanaged memory...")
             Marshal.ZeroFreeCoTaskMemAnsi(unmanagedRef)
         End If
         passWord.Dispose()

        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

Keterangan

Metode SecureStringToCoTaskMemAnsi ini berguna untuk marshaling kustom atau saat mencampur kode terkelola dan tidak terkelola. Karena metode ini mengalokasikan memori tidak terkelola yang diperlukan untuk string, selalu bebaskan memori dengan memanggil ZeroFreeCoTaskMemAnsi. Karakter string disalin sebagai karakter ANSI.

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