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C++ supports an extensive file I/O system Although the end result is the same, C++ s approach to file I/O differs somewhat from the C I/O system discussed earlier For this reason, you should pay special attention to this section In order to perform file I/O, you must include the header <fstream> in your program It defines several important classes and values

TreeNode albumNode = new TreeNode(baseName, new TreeNode[] { new TreeNode("child") });

In C++, a file is opened by linking it to a stream There are three types of streams: input, output, and input/output To open an input stream, you must declare the stream to be of class ifstream To open an output stream, it must be declared as class ofstream Streams that will perform both input and output operations must be declared as class fstream For example, this fragment creates one input stream, one output stream, and one stream capable of both input and output:

B-19

Without this child, the control would presume that our node has no children, and would not display a plus sign next to the album to permit the user to expand the node. We will make use of this in the next section, where we implement the expansion of an album node. This line simply ensures that the user can initiate this step. We also assign the Tag property for each node to contain the file path corresponding to the node. For the root node, this path is the default album directory. For each album, this path is the fully qualified album file name.

Once you have created a stream, one way to associate it with a file is by using open( ) This function is a member of each of the three stream classes The prototype for each is shown here: void ifstream::open(const char *filename, ios::openmode mode = ios::in); void ofstream::open(const char *filename, ios::openmode mode = ios::out | ios::trunc); void fstream::open(const char *filename, ios::openmode mode = ios::in | ios::out); Here, filename is the name of the file; it can include a path specifier The value of mode determines how the file is opened It must be one or more of the values defined by openmode, which is an enumeration defined by ios (through its base clase ios_base) ios::app ios::ate ios::binary ios::in ios::out ios::trunc You can combine two or more of these values by ORing them together

. . . defaultRoot.Tag = PhotoAlbum.DefaultDir; foreach (string s in Directory.GetFiles(. . .) { . . . albumNode.Tag = s; defaultRoot.Nodes.Add(albumNode); }

24:

Table B10 ISO 639 Language Codes (continued)

Including ios::app causes all output to that file to be appended to the end This value can be used only with files capable of output Including ios::ate causes a seek to the end of the file to occur when the file is opened Although ios::ate causes an initial seek to end-of-file, I/O operations can still occur anywhere within the file The ios::in value specifies that the file is capable of input The ios::out value specifies that the file is capable of output The ios::binary value causes a file to be opened in binary mode By default, all files are opened in text mode In text mode, various character translations may take place, such as carriage return, linefeed sequences being converted into newlines However, when a file is opened in binary mode, no such character translations will occur Understand that any file, whether it contains formatted text or raw data, can be opened in either binary or text mode The only difference is whether character translations take place The ios::trunc value causes the contents of a preexisting file by the same name to be destroyed, and the file is truncated to zero length When creating an output stream using ofstream, any preexisting file by that name is automatically truncated The preceding versions of open( ) are the ones defined by the ANSI/ISO standard for C++ C++ builder supports these versions However, to each it adds a third parameter, which specifies a UNIX permission code, which defaults to normal access Since this code is nonstandard, it is not used or described here The following fragment opens a normal output file