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The code snippet first creates a path to the file you wish to determine exists, test xml, in the application s temporary directory If the file exists, it returns YES; otherwise, it returns NO Note the stringByAppendingPathComponent: method This is an NSString method discussed later in this chapter; however, the method s name is intuitive You can also check if the path is to a directory, as the following code illustrates:

Connect to the Internet: This option is used to create a dial-in client that is set up through the wizard s asking you questions about your connection to your ISP Connect to the network at my workplace: This option is used to create a dial-in client to a RAS server; it also allows you to create a VPN client that connects to a VPN server Set up a home or small of ce network: This option helps you create a small home network by running the Network Setup Wizard Set up an advanced connection: This option is used to create a RAS server or a VPN server on Windows 2000 Professional or Windows XP Professional The RAS and VPN server features that come with these operating systems allow only one concurrent incoming connection

BOOL isDir; BOOL isADirectory = [[NSFileManager defaultManager] fileExistsAtPath: NSTemporaryDirectory() isDirectory:&isDir]; if(isADirectory && isDir) { NSLog(@"yes is a directory"); }

Modems are data communication devices that are used to pass data through the PSTN from node to node A modem a word that combines modulator with demodulator is used to convert a digital signal to an analog format to transmit

This code checks if the path to a file exists and is also a directory Notice that you are not passing a BOOL, but rather an address of a BOOL, which is admittedly strange You then check that the method returns YES and that the isDir is YES If both are true, then the path exists and is a directory

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across the network It reverses the conversion process on the other end node to receive the data Typically, the EIA / TIA-232 serial standard is used to connect the modem to a computer Modem communication can be of several types: asynchronous, synchronous, or both In asynchronous communication, all data is sent separately, relying on the node on the other end to translate the packet order Synchronous communication sends all data in a steady stream and uses a clock signal to interpret the beginning and end of a packet Most users today employ synchronous communication in the modems that they buy Various system parameters must be set up properly to enable a modem to work These parameters de ne the system resources for the modem device to use during its operations Common parameters include serial ports, IRQs, I /O addresses, and baud rates Let s look at these parameters in more detail

NSFileManager also has techniques for listing a directory s contents Listing 9-1 illustrates using the contentsOfDirectoryAtPath:error: method, and Listing 9-2 illustrates using an NSDirectoryEnumerator class

Serial communications send signals across a point-to-point link Bits are transmitted one after another in a continuous data stream Serial ports are the typical means for connecting modems to personal computers They are based on 9-pin (DB-9) and 25-pin (DB-25) connectors commonly known as COM1, COM2, COM3, and COM4 As we mentioned earlier in the chapter, the computer side of the connection is known as the data terminal equipment (DTE) and the modem is known as the data circuit-terminating equipment (DCE) Various pins are used for different functions inside these connectors Some are used for transmitting data, others for receiving data, and the remainder for control signals You must specify the appropriate serial port settings when you set up a modem Most modems attempt to use COM1 by default Each COM port is assigned a speci c set of address variables by default when you set up connections To change the modem COM port after the setup is complete, select Start | Control Panel | Printers and Other Hardware | Phone and Modem Options Highlight the appropriate modem on the Modem page and click the Properties button

- (void) viewDidLoad { [super viewDidLoad]; NSString * bundleDir = [[NSBundle mainBundle] resourcePath];