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The following example demonstrates the use of the ProtectedData class to encrypt a string entered at the console by the user. Note that you need to reference the System.Security.dll assembly. using System; using System.Text; using System.Security.Cryptography; namespace Apress.VisualCSharpRecipes.11 { class Recipe11_19 { public static void Main() { // Read the string from the console. Console.Write("Enter the string to encrypt: "); string str = Console.ReadLine(); // Create a byte array of entropy to use in the encryption process. byte[] entropy = { 0, 1, 2, 3, 4, 5, 6, 7, 8 }; // Encrypt the entered string after converting it to // a byte array. Use CurrentUser scope so that only // the current user can decrypt the data. byte[] enc = ProtectedData.Protect(Encoding.Unicode.GetBytes(str), entropy, DataProtectionScope.LocalMachine); // Display the encrypted data to the console. Console.WriteLine("\nEncrypted string = {0}", BitConverter.ToString(enc)); // Attempt to decrypt the data using CurrentUser scope. byte[] dec = ProtectedData.Unprotect(enc, entropy, DataProtectionScope.CurrentUser);

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CHAPTER 12 s LIGHTS, CAMERA, ACTION!

// Display the data decrypted using CurrentUser scope. Console.WriteLine("\nDecrypted data using CurrentUser scope = {0}", Encoding.Unicode.GetString(dec)); // Wait to continue. Console.WriteLine("\nMain method complete. Press Enter."); Console.ReadLine(); } } }

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he Microsoft .NET Framework is an extremely ambitious platform, combining a managed runtime (the common language runtime, or CLR), a platform for hosting web applications (Microsoft ASP .NET), and an extensive class library for building all types of applications. However, as expansive as the .NET Framework is, it does not duplicate all the features that are available in unmanaged code. Currently, the .NET Framework does not include every function that is available in the Win32 API, and many businesses are using complex proprietary solutions that they have built with COM-based languages such as Microsoft Visual Basic 6 and Visual C++ 6. Fortunately, Microsoft does not intend for businesses to abandon the code base they have built up when they move to the .NET platform. Instead, the .NET Framework is equipped with interoperability features that allow you to use legacy code from .NET Framework applications and even access .NET assemblies as though they were COM components. The recipes in this chapter describe how to do the following: Call functions defined in a DLL, get the handles for a control or window, invoke an unmanaged function that uses a structure, invoke unmanaged callback functions, and retrieve unmanaged error information (recipes 12-1 through 12-5) Use COM components from .NET Framework applications, release COM components, and use optional parameters (recipes 12-6 through 12-8) Use ActiveX controls from .NET Framework applications (recipe 12-9) Expose the functionality of a .NET assembly as a COM component (recipe 12-10)

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4. Type 3 in the recursion-depth box. 5. Click the Check button. After what seems to be an eternity, you get a detailed report, such as the one shown in the following figure.

You need to call a C function in a DLL. This function might be a part of the Win32 API or your own legacy code.

In Listing 11-12, we have two variables being used after on replace : oldValue is used for getting the old value of the sequence, and newElements is used for getting the changed elements alone. The new sequence is of course, assigned to the seq variable itself. When you look at the output, the oldValue printed is the value of the sequence before the actual change, and newElements prints out the elements that are added to the sequence either new or replacing some of the existing elements. Note that newElements does not print anything when an element is deleted from the sequence (line 3 of the output). Another important point to notice is in line 6 of the output, which is triggered by line 8 from the code. This line tries to replace three elements in the sequence with two other elements, H and J. When you look at the output, these two new elements are coalesced to print HJ, and that's what has been assigned to newElements. Again the last line of output (line 7) does not print any newElements value, since it is triggered by a delete statement. Now let us see the same example with the second syntax (Listing 11-13).

Declare a method in your C# code that you will use to access the unmanaged function. Declare this method as both extern and static, and apply the attribute System.Runtime.InteropServices. DllImportAttribute to specify the DLL file and the name of the unmanaged function.

If your pages have hyperlinks that point to files in the Document Gallery, click on each hyperlink and confirm that the right document opens.

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