(C++) WtTextUploader

 

WtTextUploader is example of a web application using the Wt library to let the user upload a text file and display its contents.

 

• View a screenshot of WtTextUploader (png)
• Download the Qt Creator project of WtTextUploader (zip)

 

 

 

 

 

Technical facts

 

Application type(s)

• Web application

Operating system(s) or programming environment(s)

• Ubuntu 10.10 (maverick)

IDE(s):

• Qt Creator 2.0.1

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.4.5

Libraries used:

• Boost: version 1.42
• STL: GNU ISO C++ Library, version 4.4.5
• Wt: version 3.1.2

 

 

 

 

 

Qt project file: CppWtTextUploader.pro

 

---

#------------------------------------------------- # # Project created by QtCreator 2011-03-26T18:26:28 # #------------------------------------------------- QT       += core QT       -= gui LIBS += -lwt -lwthttp -lboost_program_options QMAKE_CXXFLAGS += -DNDEBUG TARGET = CppWtAutoRun CONFIG   += console CONFIG   -= app_bundle TEMPLATE = app SOURCES += main.cpp \     wttextuploaddialog.cpp HEADERS += \     wttextuploaddialog.h

 

 

 

 

 

main.cpp

 

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//--------------------------------------------------------------------------- #include <iostream> //--------------------------------------------------------------------------- #include <boost/program_options.hpp> #include <boost/signals2.hpp> //--------------------------------------------------------------------------- #include <Wt/WApplication> #include <Wt/WEnvironment> //--------------------------------------------------------------------------- #include "wttextuploaddialog.h" //--------------------------------------------------------------------------- struct WtApplication : public Wt::WApplication {   WtApplication(const Wt::WEnvironment& env)     : Wt::WApplication(env),     m_dialog(new WtTextUploadDialog)   {     this->setTitle("WtTextUploader");     root()->addWidget(m_dialog);   }   private:   WtTextUploadDialog * const m_dialog; }; //--------------------------------------------------------------------------- Wt::WApplication *createApplication(   const Wt::WEnvironment& env) {   return new WtApplication(env); } //--------------------------------------------------------------------------- int main(int argc, char **argv) {   // Declare the supported options.   boost::program_options::options_description d(     "Allowed options for CppWtTextUploader");   std::string docroot;   std::string http_address;   std::string http_port;   d.add_options()       ("help",         "produce this help message")       ("docroot",          boost::program_options::value<std::string>(&docroot)->default_value("."),          "the docroot")       ("http-address",          boost::program_options::value<std::string>(&http_address)->default_value("0.0.0.0"),          "the server's http address")       ("http-port",          boost::program_options::value<std::string>(&http_port)->default_value("8080"),          "the server's http port")       ;   boost::program_options::variables_map m;   boost::program_options::store(     boost::program_options::parse_command_line(       argc, argv, d), m);   boost::program_options::notify(m);   if (m.count("help"))   {     //Display the options_description     std::cout << d << "\n";     return 0;   }   //Create the arguments in std::string format   std::vector<std::string> v(7);   v[0] = argv[0];   v[1] = "--docroot";   v[2] = docroot;   v[3] = "--http-address";   v[4] = http_address;   v[5] = "--http-port";   v[6] = http_port;   //Convert the arguments to char* format   std::vector<char*> w(7);   for (int i=0; i!=7; ++i) w[i] = &v[i][0];   //Give Wt the modified parameters   return WRun(w.size(), &w[0], &createApplication); } //---------------------------------------------------------------------------

 

 

 

 

 

wttextuploaddialog.cpp

 

---

//--------------------------------------------------------------------------- #include <algorithm> #include <fstream> #include <functional> #include <string> #include <vector> //--------------------------------------------------------------------------- #include <boost/filesystem.hpp> #include <boost/foreach.hpp> #include <boost/lexical_cast.hpp> //--------------------------------------------------------------------------- #include <Wt/WBreak> //--------------------------------------------------------------------------- #include "wttextuploaddialog.h" //--------------------------------------------------------------------------- WtTextUploadDialog::WtTextUploadDialog()   : m_fileupload(new Wt::WFileUpload),     m_text_log(new Wt::WTextArea),     m_text_file(new Wt::WTextArea) {   this->setContentAlignment(Wt::AlignCenter);   this->addWidget(m_fileupload);   this->addWidget(new Wt::WBreak);   m_text_log->setMinimumSize(600,100);   this->addWidget(m_text_log);   this->addWidget(new Wt::WBreak);   m_text_file->setMinimumSize(600,200);   this->addWidget(m_text_file);   //Upload automatically when the user entered a file   m_fileupload->changed().connect(     m_fileupload,     &Wt::WFileUpload::upload);   //Call WtTextUploadDialog::on_upload_done when file is uploaded   m_fileupload->uploaded().connect(     this,     &WtTextUploadDialog::on_upload_done); } //--------------------------------------------------------------------------- void WtTextUploadDialog::on_upload_done() {   m_text_log->setText(       std::string("Upload done")     + boost::lexical_cast<std::string>('\n')     + std::string("Client filename: ")     + m_fileupload->clientFileName().toUTF8()     + boost::lexical_cast<std::string>('\n')     + std::string("Spoolfilename: ")     + m_fileupload->spoolFileName()     + boost::lexical_cast<std::string>('\n')     + std::string("Does spoolfile exist: ")     + std::string(       boost::filesystem::exists(m_fileupload->spoolFileName())       ? "Yes"       : "No")     );   const std::vector<std::string> v     = FileToVector(m_fileupload->spoolFileName());   std::string s;   BOOST_FOREACH(const std::string t,v)   {     s+=t+boost::lexical_cast<std::string>('\n');   }   m_text_file->setText(s); } //--------------------------------------------------------------------------- ///FileToVector reads a file and converts it to a std::vector<std::string> ///From http://www.richelbilderbeek.nl/CppFileToVector.htm const std::vector<std::string> WtTextUploadDialog::FileToVector(   const std::string& filename) {   assert(boost::filesystem::exists(filename));   std::vector<std::string> v;   std::ifstream in(filename.c_str());   std::string s;   for (int i=0; !in.eof(); ++i)   {     std::getline(in,s);     v.push_back(s);   }   return v; } //---------------------------------------------------------------------------

 

 

 

 

 

wttextuploaddialog.h

 

---

#ifndef WTTEXTUPLOADDIALOG_H #define WTTEXTUPLOADDIALOG_H //--------------------------------------------------------------------------- #include <string> #include <vector> //--------------------------------------------------------------------------- #include <Wt/WContainerWidget> #include <Wt/WFileUpload> #include <Wt/WTextArea> //--------------------------------------------------------------------------- struct WtTextUploadDialog : public Wt::WContainerWidget {   WtTextUploadDialog();   private:   Wt::WFileUpload * const m_fileupload;   Wt::WTextArea * const m_text_log;   Wt::WTextArea * const m_text_file;   void on_upload_done();   static const std::vector<std::string> FileToVector(const std::string& filename); }; //--------------------------------------------------------------------------- #endif // WTTEXTUPLOADDIALOG_H