Console.ReadLine(); }//Main

Transcription

1 IST 311 Lecture Notes Chapter 13 IO System using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Net; using System.Net.Sockets; using System.Text; using System.Threading.Tasks; namespace Chapter13FileSystem class Program static void Main(string[] args) Experiment00(); // using System.IO Experiment01(); // write a data set Experiment02(); // read a disk data set List<Person> ladies = Experiment03(); //split line to get fragments(first, last, phone) Experiment04(ladies); // echo collection of Person objects Experiment05(); // using BinaryReader & BinaryWriter Experiment06(); // random file Experiment07(); // WebClient for Internet exchange Console.ReadLine(); //Main private static void Experiment07() Console.WriteLine("\nExperiment07 >>>\n"); // create a new instance of WebClient to get NPR RSS Headlines page WebClient client = new WebClient(); string urlheadlinesnpr = " // in this example the response is an HTML page string response = client.downloadstring(urlheadlinesnpr); Console.WriteLine("Response:\n0", response); Console.WriteLine(e.Message); private static void Experiment05() Console.WriteLine("\nExperiment05 >>>\n"); //using BinaryReader & BinaryWriter FileStream filstream = new FileStream(@"c:\temp\test.bin", FileMode.Create); BinaryWriter binwriter = new BinaryWriter(filStream); double avalue = 3.14; binwriter.write("hello world"); for (int i = 0; i < 11; i++) binwriter.write(i);

2 binwriter.write(avalue); binwriter.close(); filstream.close(); string strvalue; int intvalue; double douvalue; //using BinaryReader (continuation) FileStream filstreamin = new FileStream(@"c:\temp\test.bin", FileMode.Open); BinaryReader binreader = new BinaryReader(filStreamIn); //filstreamin.seek(0, SeekOrigin.Begin); strvalue = binreader.readstring(); Console.WriteLine("STRING >> 0", strvalue); for (int i = 0; i < 11; i++) intvalue = binreader.readint32(); Console.WriteLine("INT >> 0", intvalue); douvalue = binreader.readdouble(); Console.WriteLine("DOUBLE >> 0", douvalue); Console.WriteLine("\nDone...\n"); private static void Experiment06() Console.WriteLine("\nExperiment06 >>>\n"); //read & write fixed-length records to a random file String rec1 = "111 FirstName1 LastName1 Phone1"; String rec2 = "222 FirstName2 LastName2 Phone2"; String rec3 = "333 FirstName3 LastName3 Phone3"; int reclen = rec1.length; byte[] buffer = new byte[reclen]; //buffer = Encoding.ASCII.GetBytes(rec1); //Console.WriteLine("buffer " + buffer); //rec1 = Encoding.ASCII.GetString(buffer); //Console.WriteLine("string " + rec1); //create original version of the file using (FileStream fs = new FileStream(@"c:\temp\people.dat", FileMode.Create)) using (BinaryWriter bw = new BinaryWriter(fs)) buffer = Encoding.ASCII.GetBytes(rec1); bw.write(buffer); buffer = Encoding.ASCII.GetBytes(rec2); bw.write(buffer); buffer = Encoding.ASCII.GetBytes(rec3); bw.write(buffer); //read from random file (traversing in reverse order) using (FileStream fs = new FileStream(@"c:\temp\people.dat", FileMode.Open)) using (BinaryReader br = new BinaryReader(fs)) for (int position = 2; position >= 0; position--)

3 int offset = position * reclen; fs.seek(offset, SeekOrigin.Begin); br.read(buffer, 0, reclen); Console.WriteLine("Position 0 Record: 1", position, Encoding.ASCII.GetString(buffer)); // // misc. operators, learning how to use the System.IO namespace utilities private static void Experiment00() Console.WriteLine("\nExperiment00 >>>\n"); File.Delete(@"c:/temp/dummyTextFile1.txt"); File.Delete(@"c:/temp/dummyTextFile2.txt"); File.AppendAllLines(@"c:/temp/dummyTextFile1.txt", new string[] " Line1\n Line2\n Line3\n" ); File.AppendAllText(@"c:/temp/dummyTextFile1.txt", " Line4\n Line5\n Line6"); Console.WriteLine(File.Exists(@"c:/temp/dummyTextFile1.txt")); Console.WriteLine(File.GetAccessControl(@"c:/temp/dummyTextFile1.txt")); Console.WriteLine(File.GetAttributes(@"c:/temp/dummyTextFile1.txt")); String filename Console.WriteLine("FileName: 0", filename); Console.WriteLine("Attributes: 0", File.GetAttributes(fileName)); Console.WriteLine("Created: 0", File.GetCreationTime(fileName)); Console.WriteLine("Last Accessed: 0", File.GetLastAccessTime(fileName)); FileInfo fileinfo = new FileInfo(@"c:/temp/dummyTextFile1.txt"); Console.WriteLine("FileInfo.Length 0", fileinfo.length); Console.WriteLine("FileInfo.FullName 0", fileinfo.fullname); Console.WriteLine("FileInfo.DirectoryName 0", fileinfo.directoryname); DirectoryInfo directoryinfo = new DirectoryInfo(@"c:\temp"); Console.WriteLine("directoryInfo.FullName 0", directoryinfo.fullname); Console.WriteLine(); DirectoryInfo dir = new DirectoryInfo(@"c:/temp"); Console.WriteLine("Current Directory: \n0\n", Directory.GetCurrentDirectory()); foreach (FileInfo file in dir.getfiles("*.zip")) Console.WriteLine(file.FullName.PadRight(35, ' ') + " " + file.lastwritetime.tostring().padright(25, ' ') + file.length.tostring().padright(10, ' ')); Console.WriteLine(e.Message); Console.WriteLine("\nDone Experiment01B\n");

4 private static void Experiment04(List<Person> ladies) Console.WriteLine("\nExperiment04 >>>\n"); //Print a list of Person objects (firstname, last, phone) Console.WriteLine("\nExperiment04"); foreach (Person p in ladies) Console.WriteLine(p); // private static List<Person> Experiment03() Console.WriteLine("\nExperiment03 >>>\n"); //read a file holding ladies firstname, LastName, phoneno //use the acquired data to create a List<Person> collection List<Person> people = new List<Person>(); //StreamReader infile = new StreamReader(@"c:/temp/mycsdemofile1.txt"); StreamReader infile = new StreamReader(@"c:/temp/westerosladies.txt"); String line; while ((line = infile.readline())!= null) Console.WriteLine("\nECHO>>> " + line); string[] tokens = line.split(); Console.WriteLine(tokens[0]); Console.WriteLine(tokens[1]); Console.WriteLine(tokens[2]); Person p = new Person(tokens[0], tokens[1], tokens[2]); Console.WriteLine(p); people.add(p); infile.close(); Console.WriteLine("PROBLEM: " + e.message); return people; // // read and display on console data from a text file on disk private static void Experiment02() Console.WriteLine("\nExperiment02 >>>\n"); if (!File.Exists(@"c:/temp/westerosladies.txt")) return; StreamReader infile = new StreamReader(@"c:/temp/westerosladies.txt"); String line; while ((line = infile.readline())!= null) Console.WriteLine("ECHO>>> " + line); infile.close(); Console.WriteLine("PROBLEM: " + e.message);

5 // // write ten lines to a disk file, each holding dummy firstname, last, phone private static void Experiment01() Console.WriteLine("\nExperiment01 >>>\n"); StreamWriter outputfile = new StreamWriter(@"c:/temp/westerosladies.txt"); for (int i = 0; i < 10; i++) outputfile.writeline("ladyfirstname0 ladylastname0 ladyphone0", i); outputfile.close(); Console.WriteLine("Done Phase1"); Console.WriteLine("PROBLEM: " + e.message); Experiment00 >>> True System.Security.AccessControl.FileSecurity Archive FileName: c:/temp/dummytextfile1.txt Attributes: Archive Created: 4/12/ :05:57 PM Last Accessed: 4/13/2016 1:41:26 PM FileInfo.Length 43 FileInfo.FullName c:\temp\dummytextfile1.txt FileInfo.DirectoryName c:\temp directoryinfo.fullname c:\temp Current Directory: C:\temp\Chapter13FileSystem\Chapter13FileSystem\bin\Debug c:\temp\99-camera02.zip 12/19/2014 4:41:14 PM c:\temp\lesson3.zip 4/12/2016 7:22:56 PM c:\temp\westerosladies.zip 4/12/2016 7:22:17 PM 240 Done Experiment01B Experiment01 >>> Done Phase1 Experiment02 >>> ECHO>>> ladyfirstname0 ladylastname0 ladyphone0 ECHO>>> ladyfirstname1 ladylastname1 ladyphone1 ECHO>>> ladyfirstname2 ladylastname2 ladyphone2 ECHO>>> ladyfirstname3 ladylastname3 ladyphone3 ECHO>>> ladyfirstname4 ladylastname4 ladyphone4 ECHO>>> ladyfirstname5 ladylastname5 ladyphone5

6 ECHO>>> ladyfirstname6 ladylastname6 ladyphone6 ECHO>>> ladyfirstname7 ladylastname7 ladyphone7 ECHO>>> ladyfirstname8 ladylastname8 ladyphone8 ECHO>>> ladyfirstname9 ladylastname9 ladyphone9 Experiment03 >>> ECHO>>> ladyfirstname0 ladylastname0 ladyphone0 ladyfirstname0 ladylastname0 ladyphone0 Person[First=ladyFirstName0,Last=ladyLastName0, Phone=ladyPhone0] ECHO>>> ladyfirstname1 ladylastname1 ladyphone1 ladyfirstname1 ladylastname1 ladyphone1 Person[First=ladyFirstName1,Last=ladyLastName1, Phone=ladyPhone1] ECHO>>> ladyfirstname2 ladylastname2 ladyphone2 ladyfirstname2 ladylastname2 ladyphone2 Person[First=ladyFirstName2,Last=ladyLastName2, Phone=ladyPhone2] ECHO>>> ladyfirstname3 ladylastname3 ladyphone3 ladyfirstname3 ladylastname3 ladyphone3 Person[First=ladyFirstName3,Last=ladyLastName3, Phone=ladyPhone3] ECHO>>> ladyfirstname4 ladylastname4 ladyphone4 ladyfirstname4 ladylastname4 ladyphone4 Person[First=ladyFirstName4,Last=ladyLastName4, Phone=ladyPhone4] ECHO>>> ladyfirstname5 ladylastname5 ladyphone5 ladyfirstname5 ladylastname5 ladyphone5 Person[First=ladyFirstName5,Last=ladyLastName5, Phone=ladyPhone5] ECHO>>> ladyfirstname6 ladylastname6 ladyphone6 ladyfirstname6 ladylastname6 ladyphone6 Person[First=ladyFirstName6,Last=ladyLastName6, Phone=ladyPhone6] ECHO>>> ladyfirstname7 ladylastname7 ladyphone7 ladyfirstname7 ladylastname7 ladyphone7 Person[First=ladyFirstName7,Last=ladyLastName7, Phone=ladyPhone7] ECHO>>> ladyfirstname8 ladylastname8 ladyphone8 ladyfirstname8 ladylastname8 ladyphone8 Person[First=ladyFirstName8,Last=ladyLastName8, Phone=ladyPhone8] ECHO>>> ladyfirstname9 ladylastname9 ladyphone9 ladyfirstname9 ladylastname9 ladyphone9 Person[First=ladyFirstName9,Last=ladyLastName9, Phone=ladyPhone9]

7 Experiment04 >>> Experiment04 Person[First=ladyFirstName0,Last=ladyLastName0, Phone=ladyPhone0] Person[First=ladyFirstName1,Last=ladyLastName1, Phone=ladyPhone1] Person[First=ladyFirstName2,Last=ladyLastName2, Phone=ladyPhone2] Person[First=ladyFirstName3,Last=ladyLastName3, Phone=ladyPhone3] Person[First=ladyFirstName4,Last=ladyLastName4, Phone=ladyPhone4] Person[First=ladyFirstName5,Last=ladyLastName5, Phone=ladyPhone5] Person[First=ladyFirstName6,Last=ladyLastName6, Phone=ladyPhone6] Person[First=ladyFirstName7,Last=ladyLastName7, Phone=ladyPhone7] Person[First=ladyFirstName8,Last=ladyLastName8, Phone=ladyPhone8] Person[First=ladyFirstName9,Last=ladyLastName9, Phone=ladyPhone9] Experiment05 >>> STRING >> Hello world INT >> 0 INT >> 1 INT >> 2 INT >> 3 INT >> 4 INT >> 5 INT >> 6 INT >> 7 INT >> 8 INT >> 9 INT >> 10 DOUBLE >> 3.14 Done... Experiment06 >>> Position 2 Record: 333 FirstName3 LastName3 Phone3 Position 1 Record: 222 FirstName2 LastName2 Phone2 Position 0 Record: 111 FirstName1 LastName1 Phone1 Experiment07 >>> Response: <!DOCTYPE html> <html> <head> <title>npr: Page Not Found</title> <meta http-equiv="content-type" content="text/html; charset=iso " /> <meta http-equiv="content-language" content="en-us" />... </head> <body class="missing-404"> <!--#include virtual="/include/navigation/news/header.html"--> <div id="wrapper">... <p class="bottom-missing">it's a shame that your page is lost, but stick around to browse through NPR stories about lost people, places, and things that still haven' <div class="missing-story"> <a href="/templates/story/story.php?storyid= "><img /404/404-1.jpg" alt="amilia Earhart" /></a> <h2><a href="/templates/story/story.php?storyid= ">a... </body> </html>