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The fputs( ) function writes the string pointed to by str to the specified stream It returns EOF if an error occurs The fgets( ) function reads a string from the specified stream until either a newline character is read or length characters have been read If a newline is read, it will be part of the string (unlike the 1 gets( ) function) The resultant string will be null terminated The function returns str if successful and a null pointer if an error occurs The following program demonstrates fputs( ) It reads strings from the keyboard and writes them to the file called TEST To terminate the program, enter a blank line Since gets( ) does not store the newline character, one is added before each string is written to the file so that the file can be read more easily

11000000101010000000010100010111 11111111111111111111111100000000 11000000101010000000010100101100

Because the switching domain has only one visible device configuration, all calls are either external incoming or external outgoing Though first-party call control may appear quite limiting with respect to the many functions actually being performed within a telephone system, this level of functionality is all that is required for the majority of CTI applications The CTI system configuration has no bearing on what telephony resources are in a given switching domain or vice-versa The CTI interface presenting the single-device (ie, firstparty) switching domain may be an individual telephone, a CTI server, a switch, or any other CTI component in a given system configuration Figure 6-21 shows a CTI system configuration involving a CTI server that is providing the computing domain with visibility of a single device only (Refer to 11 for more information on CTI system configurations)

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#include <stdioh> #include <stdlibh> #include <stringh> int main(void) { char str[80]; FILE *fp; if((fp = fopen("TEST", "w"))==NULL) { printf(''Cannot open file\n"); exit(1); } do { printf("Enter a string (CR to quit):\n"); gets(str); strcat(str, "\n"); /* add a newline */ fputs(str, fp); } while(*str!='\n'); return 0; }

Ah ha! Computer A s and Computer B s network IDs match! It s a local call Knowing this, Computer A can now send out an ARP broadcast, as shown in Figure 7-17, to determine Computer B s MAC address The Address Resolution Protocol (ARP) is how TCP/IP networks figure out the MAC addresses based on the destination IP address

rewind( ) The rewind( ) function resets the file position indicator to the beginning of the file specified as its argument That is, it "rewinds" the file Its prototype is void rewind(FILE *fp); where fp is a valid file pointer

Third-party call control is a call control model in which multiple devices, or device configurations, can be observed and controlled simultaneously If a particular CTI interface supports third-party call control, the switching domain it presents is one comprising two or more visible devices or device configurations This is illustrated in Figure 6-22

To see an example of rewind( ), you can modify the program from the previous section so that it displays the contents of the file just created To accomplish this, the program rewinds the file after input is complete and then uses fgets( ) to read back the file Notice that the file must now be opened in read/write mode using ''w+" for the mode parameter

The addressing for the ARP packet looks like Figure 7-18 Note that Computer A s IP address and MAC address are included

#include <stdioh> #include <stdlibh> #include <stringh> int main(void) { char str[80]; FILE *fp; if((fp = fopen("TEST", "w+"))==NULL) { printf("Cannot open file\n"); exit(1); } do { printf("Enter a string (CR to quit):\n"); gets(str); strcat(str, "\n"); /* add a newline */ fputs(str, fp); } while(*str!='\n'); /* now, read and display the file */ rewind(fp); /* reset file position indicator to start of the file */ while(!feof(fp)) { fgets(str, 79, fp); printf(str); } return 0; }

As noted earlier, the CTI system configuration has no bearing on what telephony resources are in a given switching domain Figure 6-23 shows a CTI system configuration involving a CTI interface exposed by an individual telephone station Despite this, the switching domain presented contains multiple devices and is thus an example of third-party call control (Refer to 11 for more information on CTI system configurations)

Computer B responds to the ARP by sending Computer A an ARP response (Figure 7-19) Once Computer A has Computer B s MAC address, it will now start sending packets

ferror( ) The ferror( ) function determines whether a file operation has produced an error The ferror( ) function has this prototype, int ferror(FILE *fp);

Who has the IP address 192168545 Please tell 192168523 192168523: I m 192168545! My MAC address is 00:40:05:60:7D:49

Comparing Figures 6-20 and 6-21 to Figures 6-22 and 6-23, it is clear that the only difference between first-party and third-party call control is the scope of the switching domains presented by the CTI interface implementations Third-party call control is effectively the general case, and first-party call control is a special case in which only one device is visible

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