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fread( ) and fwrite( ) To read and write data types that are longer than 1 byte, the C file system provides two functions: fread( ) and fwrite( ) These functions allow the reading and writing of blocks of any type of data Their prototypes are size_t fread(void *buffer, size_t num_bytes, size_t count, FILE *fp); size_t fwrite(const void *buffer, size_t num_bytes, size_t count, FILE *fp); For fread( ), buffer is a pointer to a region of memory that will receive the data from the file For fwrite( ), buffer is a pointer to the information that will be written to the file The value of count determines how many items are read or written, with each item being num_bytes bytes in length (Remember, the type size_t is defined as some kind of unsigned integer) Finally, fp is a file pointer to a previously opened stream The fread( ) function returns the number of items read This value may be less than count if the end of the file is reached or an error occurs The fwrite( ) function returns the number of items written This value will equal count unless an error occurs Using fread( ) and fwrite( ) As long as the file has been opened for binary data, fread( ) and fwrite( ) can read and write any type of information For example, the following program writes and then reads back a double, an int, and a long to and from a disk file Notice how it uses sizeof to determine the length of each data type

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/* Write some non-character data to a disk file and read it back */ #include <stdioh> #include <stdlibh> int main(void) { FILE *fp; double d = 1223; int i = 101; long 1 = 123023L; if((fp=fopen("test", "wb+"))==NULL) printf(''Cannot open file\n"); exit(1); } {

Interface: 192168471 Internet Address 192168476 192168481 --- 0x4 Physical Address 00-1d-e0-78-9c-d5 00-1b-77-3f-85-b4 Type dynamic dynamic

CTI messages CTI messages are implemented within CTI protocols as self-contained protocol data units (PDUs) On the other hand, procedural and object-based programmatic interfaces translate messages to sequences of functions, parameters, function return codes, call back routines, and data structures In the remainder of this chapter, CTI messages are presented in the context of the standard CTI Plug & Play protocols (See 11 for more information about standard and proprietary CTI protocols, and 12 for a discussion of standard CTI programmatic interfaces)

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Page 246 fwrite(&d, sizeof(double), 1, fp); fwrite(&i, sizeof(int), 1, fp); fwrite(&l, sizeof(long), 1, fp); rewind(fp); fread(&d, sizeof (double), 1, fp); fread(&i, sizeof(int), 1, fp); fread(&l, sizeof(long), 1, fp); printf("%f %d %ld", d, i, 1); fclose(fp); return 0; }

Now delete one of the entries in the ARP table with the command:

As this program illustrates, the buffer can be (and often is) simply the memory used to hold a variable In this simple program, the return values of fread( ) and fwrite( ) are ignored In the real world, however, you should check their return values for errors One of the most useful applications of fread( ) and fwrite( ) involves reading and writing userdefined data types, especially structures For example, given this structure,

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arp d [ip address from the previous results]

struct struct_type { float balance; char name[80]; } cust;

the following statement writes the contents of cust to the file pointed to by fp:

Run the arp a command again The line for the address you specified should be gone Now try and PING the address you deleted and check the ARP table again Is the deleted address back Whenever a computer wants to send to an IP address on another LAN, it knows to send the packet to the default gateway It still sends out an ARP, but this time to the default gateway (Figure 7-21) Once Computer A gets the default gateway s MAC address, it then begins to send packets

Parameter optionality The following annotations are typically used to indicate the requirements for a particular parameter: ''M" means mandatory, "O" means optional, and "M/O" means conditionally mandatory

fwrite(&cust, sizeof(struct struct_type), 1, fp);

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