This Boost.Filesystem example shows how to count the number of files in a folder with certain requirements. This program shows how I count the number of C++ webpages on this site!

Technical facts

Operating system(s) or programming environment(s)

Lubuntu 13.04 (raring)
Windows

IDE(s):

Qt Creator 2.7.0

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.7.3

Libraries used:

Boost: version 1.49
Qt: version 4.8.4 (32 bit)
STL: GNU ISO C++ Library, version 4.7.3

Qt project file: CppFilesystemExample1.pro


QT       += core

QT       -= gui

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app



SOURCES += main.cpp



unix {

  LIBS += -lboost_system -lboost_filesystem

}



win32 {

  INCLUDEPATH += \

    ../../Libraries/boost_1_53_0



  #Boost.System

  HEADERS += \

    ../../Libraries/boost_1_53_0/libs/system/src/local_free_on_destruction.hpp

  SOURCES += \

    ../../Libraries/boost_1_53_0/libs/system/src/error_code.cpp



  #Boost.Filesystem

  HEADERS += \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/windows_file_codecvt.hpp

  SOURCES += \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/codecvt_error_category.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/operations.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/path.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/path_traits.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/portability.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/unique_path.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/utf8_codecvt_facet.cpp \

    ../../Libraries/boost_1_53_0/libs/filesystem/src/windows_file_codecvt.cpp

}

main.cpp


#include <cassert>

#include <iostream>

#include <string>

#include <boost/filesystem.hpp>

#include <boost/foreach.hpp>

#include <boost/timer.hpp>



int main()

{

  const std::string my_folder_name = "/home/richel/Projects/Projects/RichelbilderbeekNl";

  const int min_filesize = 1000; //in bytes



  const boost::filesystem::path my_folder

    = boost::filesystem::system_complete(

        boost::filesystem::path(my_folder_name ));



  assert(boost::filesystem::is_directory(my_folder)

    && "The folder must exist");



  int n = 0;



  const boost::filesystem::directory_iterator j;

  for ( boost::filesystem::directory_iterator i(my_folder);

        i != j;

        ++i)

  {

    if ( boost::filesystem::is_regular_file( i->status() ) )

    {

      const std::string filename = i->path().filename().string();

      const std::string full_filename = my_folder_name + "/" + filename;

      const int filesize = boost::filesystem::file_size(full_filename);

      if (filename.size() >= 4

        && filename.substr(filename.size() - 4, 4) == std::string(".htm")

        && filename.substr(0, 3) == std::string("Cpp")

        && filesize > min_filesize)

      {

        ++n;

        std::cout << "(" << filesize << ") " << filename << '\n';

      }

    }

  }

  std::cout

    << "\nNumber of Cpp***.htm files bigger than "

    << min_filesize << " bytes: " << n << '\n';

}

crosscompiletowindows.sh


#!/bin/sh

#From http://richelbilderbeek.nl/CppQtCrosscompileToWindowsExample15.htm



echo "Cross compiling to Windows"



echo "1/2: Creating Windows makefile"

i686-pc-mingw32-qmake CppFilesystemExample1.pro



echo "2/2: making makefile"

make



echo "Done"

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

This page has been created by the tool CodeToHtml

(C++) Boost.Filesystem example 1: count C++ webpages

Technical facts

Qt project file: CppFilesystemExample1.pro

main.cpp

crosscompiletowindows.sh