CISC181 04F class list

// readUsersFromFile.cpp // P.Conrad, Fall 2004 // CISC181, A program to read usernames from a file instead of // from the command line. It is assumed that the file "usernames.txt" // is in the "current directory" at the time the program is invoked. // The output is still written to the screen. // Note: This program is a HACK. I hesitate to show it to you, because // it might not be the "best" style throughout. Nevertheless, I'm going // to show it anyway, because you'll see a lot of code in the real world // that started out as a "hack" and ended up in production. // So you might as well see some now, and have a discussion about // the style points that arise... #include using namespace std; #include // for reading directly from a disk file using std::ifstream; // input file stream void outputHTMLHeader(ostream &outf) { outf << "\n" << "\n" << "\n" << "CISC181 04F class list\n" << "\n" << "\n" << "\n" << "\n" << "

CISC181 04F class list

\n" << "

Sorted first by section, then by last name, \n" << "then by first name

\n" << "

If you are registered for CISC181 and your name \n" << "does not appear on this list, \n" << "please email Prof. Conrad to let him know. For the \n" << "web ring, link to the person\n" << " whose name appears immediately below yours (even if \n" << " that person is in a different " << " section). The last person on the list should link back \n" << " to the first person\n" << " on the list (completing the ring).

\n" << "

Note that when you establish your link, the person you \n" << " are linking "to" might\n" << " not have completed their web page yet; email him/her \n" << " (his/her userid, followed\n" << " by @udel.edu) to encourage him/her to do so! Only then \n" << " can you really test\n" << " whether your link is correct or not.

\n" << "

Also, memorize who you are linking to; we'll use that \n" << " information to call\n" << " the roll in future lecture and lab sessions.

\n" << "\n" << endl; } void outputHTMLTrailer(ostream &outf) { outf << "\n" << "\n" << endl; } void outputUdelLinkCell(ostream &outf, const char * const username, const char * const linkSuffix, const char * const linkText ) { const char * const linkPrefix="http://udel.edu/"; outf << " " << endl; } const int MAX_USERNAME_LENGTH = 8; // restriction of 8 comes from Unix rules const int MAX_NAME_LENGTH = 80; // make it nice and big const int LINE_LENGTH = 80; // make it nice and big const int MAX_SECT_LENGTH = 3; void parseInputLine(char * const inputLine, char * const username, char * const studentFirstName, char * const studentLastName, char * const sectionString) { char *usernamePtr; char *studentFirstNamePtr; char *studentLastNamePtr; char *sectionPtr; studentLastNamePtr = strtok(inputLine,","); strncpy(studentLastName, studentLastNamePtr, MAX_NAME_LENGTH); studentLastName[MAX_NAME_LENGTH]='\0'; // null terminate for safety studentFirstNamePtr = strtok(NULL,","); strncpy(studentFirstName, studentFirstNamePtr, MAX_NAME_LENGTH); studentFirstName[MAX_NAME_LENGTH]='\0'; // null terminate for safety usernamePtr = strtok(NULL,","); strncpy(username, usernamePtr, MAX_USERNAME_LENGTH); username[MAX_USERNAME_LENGTH]='\0'; // null terminate for safety sectionPtr = strtok(NULL,","); strncpy(sectionString, sectionPtr, MAX_SECT_LENGTH); sectionString[MAX_SECT_LENGTH]='\0'; // null terminate for safety } int main(void) { // try to open an input file ifstream userInputFile("usernames.txt",ios::in); // open the file // test whether the file was opened correctly using the // overloaded ! operator; returns false if opening the file failed if (!userInputFile) { cerr << "usernames.txt file could not be opened" << endl; exit (-1); } ofstream outf("class.html",ios::out); // open the file if (!outf) { cerr << "class.html file could not be opened" << endl; exit (-1); } outputHTMLHeader(outf); char username[MAX_USERNAME_LENGTH+1]; // +1 because of \0 char studentFirstName[MAX_NAME_LENGTH+1]; // +1 because of \0 char studentLastName[MAX_NAME_LENGTH+1]; // +1 because of \0 char inputLine[LINE_LENGTH+1]; // +1 because of \0 char sectionString[MAX_SECT_LENGTH+1]; // +1 because of \0 int count = 0; // try to read first line from input file userInputFile.getline(inputLine,LINE_LENGTH); while (!userInputFile.eof()) // will stop at end of file, or at CTRL/D { count ++; // convert username into URL and print it out // parse comma separated fields using strtok parseInputLine(inputLine,username,studentFirstName,studentLastName, sectionString); cout << "Student: " << studentFirstName << " " << studentLastName<< " Userid: " << username << " Section: " << sectionString << endl; outf << "\n"; outputUdelLinkCell(outf, username, "", username); outputUdelLinkCell(outf, username, "/cisc181", "cisc181"); outputUdelLinkCell(outf, username, "/cisc181/lab08", "lab08"); outputUdelLinkCell(outf, username, "/cisc181/proj1", "proj1"); outf << "" << "\n" << endl; // get the next line of input userInputFile.getline(inputLine,LINE_LENGTH); } outputHTMLTrailer(outf); // a parting thought cout << "\nThere were " << count << " lines in this file\n" << endl; return 0; }

" << linkText << "
" << studentFirstName << " " << studentLastName<< "	" << sectionString << "