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The idea behind P/Invoke is that you create a prototype of the DLL s unmanaged function that you want to call using the DllImportAttribute class. You can declare these prototypes in one of two ways: as global functions or as static methods within a class. You implement these global functions and/or static methods just as you would any other function or method. Of course, you have to use the syntax defined by your prototype. As the class name suggests, DllImportAttribute is an attribute and is implemented with the special square bracket syntax that is covered in 20. The DllImportAttribute when compiled generates metadata but no code. This metadata helps the CLR s P/Invoke process figure out where the DLL is and the calling convention to interface with this DLL. The first and only mandatory positional parameter passed to DllImportAttribute is the name of the DLL that houses the function to be prototyped. Part of the P/Invoke process is to find and load this DLL. If the name alone does not provide enough information for the CLR to find the current location of the DLL, you will get a runtime error stating that the DLL cannot be found (see Figure 23-4). If this occurs, you need to do one of two things. Move the DLL to someplace that the CLR can find it (I usually put it in the same directory as the .exe file or the System32 directory) or, instead of passing just the name of the DLL, provide a full or relative path to the DLL. I show the relative path technique in the previous example.

Remember that when you are sampling an application you never have to instrument the assemblies; Tip so that step is always skipped. In addition, remember that the options for the CLR environment are /globaltrace (on or off) for instrumentation performance tests, and /globalsample (on or off) for sampling performance tests.

We really didn't do too much here. The most interesting part handling a user selection that should put the video on the externalScreen has been foisted off on a vaguely defined delegate object. Let's make that a bit more concrete, by having VideoToyViewController act as the delegate for VideoCell. This controller will now keep track of the selected VideoCell instance, as well as a UIWindow assigned to an external screen, if there is one. Open VideoToyViewController.h, and make the changes shown here:

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Using a full path in the position parameter of the DllImportAttribute can be dangerous as not everyone has their directory structure set up the same as you do. Using a relative path is a little safer as long as the relative path is controlled by your installation process.

Following the DLL s name are six optional named parameters, which further help the CLR P/Invoke process access the DLL and implement the unmanaged function. The named parameters are as follows.

To profile an application using sampling, you would start the application (which in the case of the sample application is not particularly useful since everything occurs on startup) and attach to the process using the vsperfmon /attach [PID]. Then you would use the application; when it is complete you would use the vsperfmon /detach command. To profile a service, using either sampling or instrumentation, the only changes you would make would be to start the monitor (include the /user parameter option of the vsperfcmd application with the username the service is running under); start the service; attach to the executable the service is running; run the tests; and detach afterward. The setup and shutdown steps are the same as listed above.

CallingConvention is an enumeration that defines the calling convention used when passing arguments to the unmanaged function. The default is StdCall, where the callee cleans the stack.

// VideoToyViewController.h #import <UIKit/UIKit.h> #import <MediaPlayer/MediaPlayer.h> @class VideoCell; @interface VideoToyViewController : UITableViewController { NSMutableArray *urlPaths; IBOutlet VideoCell *videoCell; UIWindow *externalWindow; VideoCell *selectedCell; } @property (retain, nonatomic) NSMutableArray *urlPaths; @property (retain, nonatomic) UIWindow *externalWindow; @property (retain, nonatomic) VideoCell *selectedCell; @end

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