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To see how this works, let s look at a method offered by the Windows kernel32.dll library called MoveFile.* Unlike COM components, ordinary Win32 DLLs do not include enough metadata to describe fully the methods they offer they re designed to be called from C or C++, and the full descriptions live in header files provided as part of the Windows SDK. But the C# compiler doesn t know how to read C header files, so we need to provide a complete description of the signature of the method we plan to use. We do this by declaring the method as a static extern and use the DllImport attribute:

[DllImport("kernel32.dll", EntryPoint="MoveFile", ExactSpelling=false, CharSet=CharSet.Unicode, SetLastError=true)]

In previous chapters, you used the mashup creator to find, drag and drop, configure, and connect blocks. You also learned how to preview, test, embed them in web pages. During all of these activities, the blocks have been executing in the Popfly Runtime Environment. The Popfly Runtime Environment (PRE) allows you to develop and share your mashups. It requires that you define your blocks with a description and code (see Figure 7-3).

* This example is for illustrative purposes in a real program, you d just use the FileInfo class s MoveTo method because it s more convenient. FileInfo uses P/Invoke internally it calls the Win32 MoveFile for you when you call MoveTo.

static extern bool MoveFile( string sourceFile, string destinationFile);

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ACLs can be used to implement one of three access control models the mandatory access control (MAC) model, the discretionary access control (DAC) model, and the role-based access control (RBAC) model sometimes called the non-discretionary access model.

The DllImport attribute class is used to indicate that an unmanaged method will be invoked through P/Invoke. The parameters are as follows: DLL name This is the name of the DLL that contains the method you are invoking.

The CLR understands certain DLL method naming conventions. For example, there is in fact no MoveFile method there are two methods, MoveFileA and MoveFileW, designed for the ANSI and Unicode string representations, respectively. Setting ExactSpelling to false lets the CLR select a method based on these rules.

Setting this to true allows you to call Marshal.GetLastWin32Error, and check whether an error occurred when invoking this method. In fact, all of these are optional except for the DLL name. If you leave out EntryPoint, .NET uses the method name as the entry point name. ExactSpelling is false by default you set this to true only if you want to disable the use of normal naming conventions. And if you leave out CharSet, the CLR will use Unicode if it s available. SetLastError is off by default, so although it s optional, it s usually a good idea to set it. Therefore, in practice, we would probably just write this:

[DllImport("kernel32.dll", SetLastError=true)] static extern bool MoveFile( string sourceFile, string destinationFile);

The main reason P/Invoke offers all these optional settings is that some DLLs don t follow the usual conventions. Most of the time the defaults do the right thing, but just occasionally you need to override them. With this declaration in place, we can now call MoveFile() like any other static method. So if that declaration were inside a class called Tester, we could write:

Mandatory Access Control (MAC)

Tester.MoveFile(file.FullName, file.FullName + ".bak");

We pass in the original filename and the new name, and Windows moves the file for us. In this example, there is no advantage and actually a considerable disadvantage to using P/Invoke. (Situations where you truly need P/Invoke are increasingly rare and obscure. To illustrate the mechanisms, we ve picked an example that s simple enough not to obscure the details of how P/Invoke works, but this means it s not a scenario in which you d use P/Invoke in practice.) You have left the world of managed code, and the result is that you ve abandoned type safety and your code will no longer run in

partial-trust scenarios. Example 19-2 shows the complete source code for using P/ Invoke to move the files.

The description part of the block is XML that describes the blocks properties and operations that are used by the mashup creator. The code part of the block is the JavaScript used to execute the operations defined in the description. Both code and description work together to provide functionality within a block. To get a better idea about how blocks are architected, let s look at the RSS block as an example (the next chapter will explain in more detail where and how to see the code for blocks).

using System; using System.IO; using System.Runtime.InteropServices; namespace UsingPInvoke { class Tester { // declare the WinAPI method you wish to P/Invoke [DllImport("kernel32.dll", EntryPoint = "MoveFile", ExactSpelling = false, CharSet = CharSet.Unicode, SetLastError = true)] static extern bool MoveFile( string sourceFile, string destinationFile); public static void Main() { // make an instance and run it Tester t = new Tester(); string theDirectory = @"c:\test\media"; DirectoryInfo dir = new DirectoryInfo(theDirectory); t.ExploreDirectory(dir); } // Set it running with a directory name private void ExploreDirectory(DirectoryInfo dir) { // make a new subdirectory string newDirectory = "newTest"; DirectoryInfo newSubDir = dir.CreateSubdirectory(newDirectory); // get all the files in the directory and // copy them to the new directory FileInfo[] filesInDir = dir.GetFiles(); foreach (FileInfo file in filesInDir) { string fullName = newSubDir.FullName + "\\" + file.Name; file.CopyTo(fullName); Console.WriteLine("{0} copied to newTest", file.FullName); } // get a collection of the files copied in filesInDir = newSubDir.GetFiles();

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