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// This program contains an error and will not compile #include <iostream> using namespace std; enum access_t {shared, in_use, locked, unlocked}; // a scarce resource control class class access { static enum access_t acs; int i; // non-static // public: static void set_access(enum access_t a) { acs = a; } static enum access_t get_access() { i = 100; // this will not compile return acs; } // }; enum access_t access::acs; // define acs

Our MDI application is coming along nicely. So far we have a parent form that contains MainForm class instances as child forms. Each form displays a new or existing album, and the menu bars have been integrated to present a logical set of choices for the user. There are additional members of the Form class that are related to the creation of MDI applications. This section will examine a few of these members as we correct some issues with our MyPhotos MDI application. If you have experimented with the MyPhotos interface created in the previous section, you may have found the following three issues that do not behave as you might expect. The toolbar control. The toolbar on the child form gives access to the New and Open menu in the MainForm class, which we are trying not to expose in the MDI version of our application. The pixel data form. This dialog appears separate from the MDI application, rather than as a child form within it. In addition, when multiple album windows are open, each window opens its own separate PixelDlg form, which can get rather confusing. Opening multiple albums. If you open the same album twice, you end up with two windows both showing the same album. Aside from the errors that can occur from having two instances operate on different versions of the same album simultaneously, it seems a bit strange to permit two copies of the same file to open in the same parent window. We will address each of these items separately, and make use of MDI-related members of the Form class as required.

26:

REPLACING THE TOOLBAR Our toolbar was designed to interact with the menu bar for our MainForm class, and not the merged menu in our MDI application. As a result, it is no longer appropriate for our purposes. As a simple solution to this problem, we will simply hide the toolbar when the MainForm object is an MDI child form. While we are at it, we can create a very simple toolbar in the ParentForm class to demonstrate such a control in an MDI application. Figure 16.6 shows our application after these changes have been made.

int main() { access obj1, obj2; access::set_access(locked); // call using class name // intervening code // see if obj2 can access resource if(obj2get_access()==unlocked) { // call using object access::set_access(in_use); // call using class name cout << "Access resource\n"; } else cout << "Locked out\n"; // return 0; }

Basically, one producer (Producer A) grants permission to another producer (Producer B) to access Producer A s application Thus, Producer B can access the disc-specific area of the application from Producer A to share data In order to do so, a certain information exchange is necessary First, Producer B (grantee) has to provide the Organization ID, Application ID, and root certificate of Application B to Producer A (grantor) Then, Producer A will create a credential and provide it to Producer B along with its own signature that was used for the initial Application A As the last step, the credential is implemented in Application B s permission request file (PRF), and Producer B can then access Application A s data in the local storage area This all may seem a little bit confusing, but the process provides a lot of flexibility in managing BD-J applications and data stored in local storage areas However, to keep it all organized, it is recommended to properly plan a disc beforehand to make sure that the data stored in local storage is available to all discs that need to access it And, bearing the complexity of the process in mind, it is also recommended to thoroughly test the workflows before implementing it on discs In that way, a desired functionality and user experience can be guaranteed

Figure 16.6 The toolbar here must locate the appropriate event handler for the active child form whenever a button is clicked.