Csig 2014-05

Month

Brief Information about the May 20th CSIG Meeting

Fsearch.cs - Console App for File Searching Whole Hard Drive by B. Arnold

The goal (or object) for this month is to scan the entire C:\Users drive and locate any file whose name includes the given string. All targets are printed to the system STDOUT and may be redirected to a file. Because this is a console type program, the speed is quite spectacular. Error handling and Recursion topics are also covered. The program uses DOTNET library functions and may easily be converted to C++. See the screen-shot and description paragraphs below.

eSenders Sample

Welcome to the CSIG, a Special Interest Group of the ACGNJ. This is an exciting time for the C Language programming since Microsoft now has 4 different language compilers: C++, C++ Express, C-Sharp, and C-Sharp Express. These are all capable of creating Windows (tm) programs. (Some are FREE!)

New for this month is the following.

This is a CLI DOT NET program is coded using C-sharp (C#) and is very similar to C++. It also still uses the same DOT NET libraries.

The program uses a number of DOT NET Library functions including the following:

errorWriter	ReadLine	Try and Catch	Console I/O
TextWriter	DirectoryInfo	Exceptions	Main
WriteLine	EnumerateFiles	Recursive	ToString

There are a number of ways to refer to Microsoft's latest compilers and code. Here's what Wikipedia says: The Common Language Infrastructure (CLI) is an open specification developed by Microsoft that describes the executable code and runtime environment that form the core of the Microsoft .NET Framework. The specification defines an environment that allows multiple high-level languages to be used on different computer platforms without being rewritten for specific architectures.

Microsoft .Net Framework 4.5

C++ 9.0, etc.

.Net 4.5, etc.

CLI

Common Language Infrastructure

Sample Code


// Fsearch.cs  "FILE SEARCH"     B.Arnold    20-May-2014

// Object: to scan the entire C:\Users drive and locate any file whose name includes
// the given string.  All targets are printed to the system STDOUT and may be 
// redirected to a file.  Because this is a console type program, the speed is 
// quite spectacular.  Error handling and Recursion topics are also covered.

// The program uses DOTNET library functions and may easily be converted to C++.


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Security;

namespace Fsearch
    {
    class Program
        {
        static string version =
            " FSEARCH search_string   ---   Version 1.00 by B.Arnold May 2014 \n" +
            " =============================================================== \n" +
            " Wildcard specifiers \n" +
            " * --- zero or more characters in that position. \n" +
            " ? --- zero or one character in that position. \n" +
            " anything else is considered a literal character. \n";
        static string mQuery;
        static int count, dircount;

        static void Main(string[] args)
            {
            mQuery = "*";
            count = dircount = 0;

            if (args.Count() > 0)               // Console.WriteLine(args[0]);
                {
                mQuery = args[0].ToString();

                Process("C:\\Users");               // root
                }
            else
                Console.WriteLine(version);

            TextWriter errorWriter = Console.Error;
            errorWriter.WriteLine("\n ==> " + dircount + " <== Directories Scanned. \n");
            errorWriter.WriteLine("\n ==> " + count + " <== Filenames Listed. (Press Enter)");

            Console.ReadLine();                 //Wait for user
            
            }



        static void Process(string root)
            {
         if (!root.EndsWith("\\")) root += "\\";
            DirectoryInfo mPath = new DirectoryInfo(root); ++dircount;

            // Scan the files in this directory.
            // --------------------------------
            // MS: "EnumerateFiles can be more efficient than GetFiles for large tasks."
            try
                {
                foreach (var mFile in mPath.EnumerateFiles(mQuery, SearchOption.TopDirectoryOnly))
                    {
                    Console.WriteLine(mFile.FullName); ++count;
                    }
                }

                     //// Land here if EnumerateFiles fails ...
            catch (DirectoryNotFoundException dnf) { ; }    //Console.WriteLine("Not Found Exception"); }
            catch (SecurityException se) { ; }              //Console.WriteLine("Security Exception"); }
            catch (UnauthorizedAccessException uae) { ; }   //Console.WriteLine("Unauthorized Access Exception");

            // Scan the Folders in this directory.
            // --------------------------------
            try
                {
                foreach (var mDirName in mPath.EnumerateDirectories("*.*", SearchOption.TopDirectoryOnly))
                    {
                    Process(mDirName.FullName);   // RECURSIVE !!!  RECURSIVE !!!  RECURSIVE !!! 
                    }
                }

                     //// Land here if EnumerateFiles fails ...
            catch (DirectoryNotFoundException dnf) { ; }    //Console.WriteLine("Dir Not Found Exception"); }
            catch (SecurityException se) { ; }              //Console.WriteLine("Dir Security Exception"); }
            catch (UnauthorizedAccessException uae) { ; }   //Console.WriteLine("Dir Unauthorized Access Exception"); }
            }

        }
    }

SOURCE CODE

Source Code Files

For help, email me at b a r n o l d @ i e e e . o r g

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