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Of course, a more complex tree hierarchy will require nodes at various levels of the tree to expand and collapse depending on their requirements. The code we created here is for a three-level tree, but can be extended to support more complicated structures. Once again it is worth mentioning that the use of the Tag property works well in our application since there are only three types of objects. For a more complex tree view, consider creating one or more new classes based on the TreeNode class. So far we have not worried about synchronizing the contents of our ListView and TreeView controls. In the next section we finally take up this topic while discussing the selection of tree nodes.

This works because get( ) returns the stream in, and in will be null when the end of the file is encountered This program uses put( ) to write a string that includes non-ASCII characters to a file

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A node in a tree view is selected whenever the user clicks on the node with the mouse. In our application, the tree nodes correspond to albums and photographs that can be displayed in the ListView area of the form. Whenever a user selects a node, the contents of that node should be displayed in the list view. Such behavior is typical of applications that employ a TreeView control. The nodes in the tree contain or refer to other data that is or can be displayed on the form. Whenever a new tree node is selected, the data displayed must be updated as well. For example, in Windows Explorer, the tree view contains directories,1 while the list view contains files contained in these directories. When the user selects a directory entry from the tree view, the contents of that directory are displayed in the list view of the window. The reverse is also true. When the user double-clicks on a directory in the

#include <iostream> #include <fstream> using namespace std; int main() { char *p = "hello there\n\r\xfe\xff"; ofstream out("test", ios::out | ios::binary); if(!out) { cout << "Cannot open file\n"; return 1; } while(*p) output(*p++); outclose(); return 0; }

list view, that directory is shown in the tree view and its contents are displayed in the list view. In this section we will look at how to implement this behavior in our MyAlbumExplorer application. This will link up our TreeView and ListView controls so they work together and present a consistent interface to the user. These changes come in two flavors. First there are changes to ensure that the ListView is properly updated when the TreeView changes. Next there are changes to ensure that the TreeView is properly updated when the ListView changes. All of these updates will be driven by the selection of a tree view node using the SelectedNode property of the TreeView control. Figure 15.8 shows our application with an album selected in the tree view and the corresponding collection of photographs displayed in the list view.

Using read( ) and write( )

The second way to read and write binary data uses C++ s read( ) and write( ) member functions The prototypes for two of their most commonly used forms are istream &read(char *buf, streamsize num); ostream &write(const char *buf, streamsize num); The read( ) function reads num bytes from the associated stream and puts them in the buffer pointed to by buf The write( ) function writes num bytes to the associated stream from the buffer pointed to by buf streamsize is some form of integer that is capable of holding the number of characters that can be transferred in any one I/O operation The following program writes and then reads an array of integers:

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We will begin these changes by updating our form when a node is selected in our TreeView control. 15.4.1 SUPPORTING NODE SELECTION As we saw for the expand and collapse operations, there are two events associated with node selection. The BeforeSelect event occurs before the node is selected in the control, and receives a TreeViewCancelEventArgs instance containing the event data. The AfterSelect event occurs after the node has been selected, and receives a TreeViewEventArgs instance.

#include <iostream> #include <fstream> using namespace std; int main()

It also contains disks, the desktop, the control panel, and other objects. For the purposes of our example, we can pretend that it contains only directories.

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{ int n[5] = {1, 2, 3, 4, 5}; register int i; ofstream out("test", ios::out | ios::binary); if(!out) { cout << "Cannot open file\n"; return 1; } outwrite((char *) &n, sizeof n); outclose(); for(i=0; i<5; i++) // clear array n[i] = 0; ifstream in("test", ios::in | ios::binary); inread((char *) &n, sizeof n); for(i=0; i<5; i++) // show values read from file cout << n[i] << " "; inclose(); return 0; }