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Brief Information about the April '13 CSIG Meeting

FStat210 - File Extension Stats on your File System - Code Speed Optimization

Visual Studio 2012 Experss Demo

by Bruce Arnold
Thumbnails Thumbnails

Note: Application has been compiled with the free Visual Studio Express 2012 compiler.
The source/project may be converted back to an older compiler with this PROCEDURE.
Also, check out this web site for a possible solution to the Form Applicaton issue:
c-cli-template-of-windows-form-application-in-visual-studio-express-2012

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!)

Here's a brief synopsis of this month's meeting:

This month we will optimise the program code by benchmarking specific areas of the program that seem to take too much time. This will involve examples of the Microsoft "StopWatch" class and methods.

Last month continued a multi-part presentation of creating an application with a particular purpose. The first step is the algorithm.  Next, this must be coded to verify the plan.  The code presented last month created a Console type program.. There's no point in struggling with the Windows functions until the algorithm viability and performance has been verified. The "Top40" App used Microsoft's C++/CLI features and simply displays to a "DOS" box. Now that  we have confidence in the approach, the program can then be converted into a Windows program using the normal user interface and dotnet functions. (Note: this will be a dotnet re-write of  FSTAT presented in Csig2005.)

Flow ChartObject: to scan the entire C: drive and tabulate the statistics of all of the files. (The user may also choose other drives, subdirectories, flash, and network drives.) Stats include size and count totals, and percent relative to file extension. Directory functions will be used for the scanning and temperred with exception (error) handling code for special circumstances. There will be activity on the screen during scanning so that the user is kept informed. The internal working database is a System::Collections::Generic::List. The output is via a Form::ListView control and options have beed added to sort columns or to copy data to the clipboard. ( <=== Click FlowChart at left. )

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

abort application array binarysearch break
clientrectangle clientsize clipboard collection default
define dialogresult directory doevents doublebuffered
EnumerateFiles formclosing gcnew icomparable icomparer
icontainer ienumerable image include list
listview listviewitem mainmenustrip namespace nullptr
pathtoolong progressbarstyle public queue random
record rectangle rectangletoscreen recursive EnumerateDirectories
showdialog tobitmap topdirectoryonly winlogo


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 3.5, etc.
C++ 9.0, etc.
.Net 3.5, etc.
CLI
Common Language Infrastructure
Managed


Here's what Nishant Sivankumar (C++/CLI in Action) says:
The role of C++/CLI C++ is a versatile programming language with a substantial number of features that makes it the most powerful and flexible coding tool for a professional developer. The Common Language Infrastructure (CLI) is an architecture that supports a dynamic language-independent programming model based on a Virtual Execution System. The most popular implementation of the CLI is Microsoft’s .NET Framework for the Windows operating system. C++/CLI is a binding between the standard C++ programming language and the CLI.


Sample Code

             void Process(String ^ root) // Recursive file search
                {
                String ^mPath;
                FSTATdata record;

                mPath = root;
                if (!mPath->EndsWith("\\")) mPath += "\\";
                Application::DoEvents();   //check for messages in queue.

                // Scan the files in this directory.
                // --------------------------------
                // MS: "EnumerateFiles can be more efficient than GetFiles for large tasks."
                // MS: "This requires dotNet 4 (VS2010 and VS2012)."
                try
                   {
                   System::Collections::Generic::IEnumerable<String ^> ^ iFiles = 
                      Directory::EnumerateFiles(mPath, "*.*");  // default = TopDirectoryOnly
                   for each (String ^ fileName in iFiles)
                      {
                      if (gbl->Abort) break;
                      CatogorizeFile( fileName);
                      if (Metronome) UpdateActivity( fileName);
                      }
                   }
                         //// Land here if EnumerateFiles fails ...
                catch ( System::UnauthorizedAccessException ^uae)   {   gbl->Permissions++ ;   }
                catch ( System::IO::PathTooLongException ^ptl)      {   gbl->PathTooLong++ ;   }
                catch ( ... )                               {   gbl->GeneralError++ ;   }

                // Scan the directories in this directory.
                // --------------------------------------
                try
                   {
                   System::Collections::Generic::IEnumerable<String ^> ^ iDirs = 
                      Directory::EnumerateDirectories(mPath, "*.*");
                   for each (String ^ dirName in iDirs)
                      {
                      if (gbl->Abort) break;
                      ++gbl->Loop;
                      Process( dirName);   // RECURSIVE !!!  RECURSIVE !!!  RECURSIVE !!! 
                      }
                   }
                          // Land here if EnumerateDirectories() fails ...
                catch ( System::UnauthorizedAccessException ^uae)   {   gbl->Permissions++ ;   }
                catch ( System::IO::PathTooLongException ^ptl)      {   gbl->PathTooLong++ ;   }
                catch ( ... )                               {   gbl->GeneralError++ ;   }

                if (gbl->PathTooLong > MAXERRORS || gbl->FileErrors > MAXERRORS || gbl->GeneralError > MAXERRORS)
                   gbl->Abort = true;
                }

             /*   *********************************************************************************************** */
             // Decide whether or not to add file type into database.
             void CatogorizeFile(String ^ filename)
                {
                // If Extension exists in mList, bump count & kbytes
                // Else
                //      Add entry with a count of 1.
                //      Re-sort mList.

                FileInfo ^ fstats;
                try
                   {
                   fstats = gcnew FileInfo(filename);
                   }
                catch(...)   
                   {
                   gbl->FileErrors++ ; return;      // Skip on any error.
                   }
                FSTATdata ^record = gcnew FSTATdata();
                record->KBytes = fstats->Length >> 10;
                if ((fstats->Length & 0x3FF) > 511) ++record->KBytes;   // round up.

                record->Ext = fstats->Extension->ToUpper();
                int idx = Stats->BinarySearch(record);         // search for Ext

                if (idx < 0)
                   {
                   record->Count=1;
                   Stats->Add(record);
                   Stats->Sort();
                   }
                else
                   {
                   Stats[idx]->Count++ ;
                   Stats[idx]->KBytes += record->KBytes;
                   }
                }

             /////////////////////////////////////////////////////////////////////////////

SOURCE CODE

Source Code Files

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