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Set the version number of the MyAlbumExplorer application to 15.4. IMPLEMENT A HANDLER FOR THE AFTERSELECT EVENT Action 1 In the MainForm.cs [Design] window, add an AfterSelect event handler for the TreeView control. Obtain the file name associated with the selected node. If the file name string is null, throw an exception. Note: This should not happen, and indicates that something is wrong. 4 If the node is a top-level node, display the albums associated with this node in the list view. If the node is an album node, display the photographs associated with the album in the list view. Result

24:

private void treeViewMain_AfterSelect (object sender, System.Windows. Forms.TreeViewEventArgs e) { TreeNode node = e.Node; string fileName = node.Tag as string; if (fileName == null) throw new ApplicationException ("selected tree node has " + "invalid tag");

} fstream out(argv[1], ios::in | ios::out | ios::binary); if(!out) { cout << "Cannot open file\n"; return 1; } outseekp(atoi(argv[2]), ios::beg); output('X'); outclose(); return 0; }

494B

The next program uses seekg( ) to display the contents of a file beginning with the location you specify on the command line:

if (node.Parent == null) { // Top-level node LoadAlbumData(fileName); } else if (Path.GetExtension(fileName) == ".abm") { // Album node selected PhotoAlbum album = OpenTreeAlbum(node); LoadPhotoData(album); } else // must be a photograph { // Just clear the list for now. listViewMain.Clear(); } }

C++ #include <iostream> #include <fstream> #include <cstdlib> using namespace std; int main(int argc, char *argv[]) { char ch; if(argc!=3) { cout << "Usage: NAME <filename> <starting location>\n"; return 1; } ifstream in(argv[1], ios::in | ios::binary); if(!in) { cout << "Cannot open file\n"; return 1; } inseekg(atoi(argv[2]), ios::beg); while(inget(ch))

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As you can see, we take advantage of the LoadAlbumData and LoadPhotoData methods implemented in chapter 14. By encapsulating our load functionality in a method, we are able to reuse the methods here with no changes. Both of these methods are based on a file path from which to load the data, and we make use of this fact here to specify the appropriate data associated with the selected tree node. For a toplevel node this is an album directory. For an album node this is an album file which is loaded as a new PhotoAlbum object. For a photograph node, this is the image file, although we do not make use of this fact here. Astute readers will realize that there is some inefficiency here since we have separated the logic for updating our two views. For instance, when an album node is expanded and selected, we open the album to load the collection of photographs in the treeViewMain_BeforeExpand method, and then open the album again to update the contents of the ListView control from the treeViewMain_AfterSelect method. This is the result, in part, of how we have separated our discussion of the two controls. In a production program, you would likely want to merge these efforts to ensure that an album is only opened one time for each update. One situation we will fix is the behavior of the OnLoad method. The method performs the following tasks:

cout << ch; inclose(); return 0; }

You can determine the current position of each file pointer using these functions: pos_type tellg( ); pos_type tellp( ); Here, pos_type is a type defined by ios that is capable of holding the largest value that either function can return You can use the values returned by tellg( ) and tellp( ) as arguments to the following forms of seekg( ) and seekp( ), respectively istream &seekg(pos_type pos); ostream &seekp(pos_type pos); These functions allow you to save the current file location, perform other file operations, and then reset the file location to its previously saved location As you have seen, C++ s I/O system is both powerful and flexible Although this chapter discusses some of the most commonly used classes and functions, C++ includes several others For example, you will want to explore the getline( ) function (defined by istream) and the various overloaded forms of the I/O functions described in this chapter