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(C++) WtQt CreatorUbuntu stat: No such file or directory. Document root ("") not valid.


misc error.







Full error message


stat: No such file or directory
Document root ("") not valid.






Operating system(s) or programming environment(s)



Project type:


Libraries used:






Project file


# Project created by QtCreator 2010-11-18T12:10:20
QT       += core
QT       -= gui
TARGET = CppHelloWtQtCreatorUbuntu
LIBS += -L/usr/lib -lwt -lwthttp
CONFIG   += console
CONFIG   -= app_bundle
SOURCES += main.cpp






Build log


Running build steps for project CppHelloWtQtCreatorUbuntu...
Configuration unchanged, skipping qmake step.
Starting: "/usr/bin/make" -w
make: Entering directory `/home/richel/qtsdk-2010.04/bin/Projects/Website/CppHelloWtQtCreatorUbuntu-build-desktop'
g++ -c -pipe -DNDEBUG -g -Wall -W -D_REENTRANT -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I../CppHelloWtQtCreatorUbuntu -I/usr/include/qt4/QtCore -I/usr/include/qt4 -I. -I../CppHelloWtQtCreatorUbuntu -I. -o main.o ../CppHelloWtQtCreatorUbuntu/main.cpp
g++ -o CppHelloWtQtCreatorUbuntu main.o -L/usr/lib -L/usr/lib -lwt -lwthttp -lQtCore -lpthread
make: Leaving directory `/home/richel/qtsdk-2010.04/bin/Projects/Website/CppHelloWtQtCreatorUbuntu-build-desktop'
The process "/usr/bin/make" exited normally.






Source code


This source was copied literally from the Wt website (http://www.webtoolkit.eu/wt#/src/hello).


* Copyright (C) 2008 Emweb bvba, Heverlee, Belgium.
* See the LICENSE file for terms of use.

#include <Wt/WApplication>
#include <Wt/WBreak>
#include <Wt/WContainerWidget>
#include <Wt/WLineEdit>
#include <Wt/WPushButton>
#include <Wt/WText>

#include <boost/version.hpp>

using namespace Wt;

* A simple hello world application class which demonstrates how to react
* to events, read input, and give feed-back.
class HelloApplication : public WApplication
  HelloApplication(const WEnvironment& env);

  WLineEdit *nameEdit_;
  WText *greeting_;

  void greet();

* The env argument contains information about the new session, and
* the initial request. It must be passed to the WApplication
* constructor so it is typically also an argument for your custom
* application constructor.
HelloApplication::HelloApplication(const WEnvironment& env)
  : WApplication(env)
  setTitle("Hello world");                               // application title

  root()->addWidget(new WText("Your name, please ? "));  // show some text
  nameEdit_ = new WLineEdit(root());                     // allow text input
  nameEdit_->setFocus();                                 // give focus

  WPushButton *b = new WPushButton("Greet me.", root()); // create a button
  b->setMargin(5, Left);                                 // add 5 pixels margin

  root()->addWidget(new WBreak());                       // insert a line break

  greeting_ = new WText(root());                         // empty text

   * Connect signals with slots
   * - simple Wt-way
  b->clicked().connect(this, &HelloApplication::greet);

   * - using an arbitrary function object (binding values with boost::bind())
    (boost::bind(&HelloApplication::greet, this));

void HelloApplication::greet()
   * Update the text, using text input into the nameEdit_ field.
  greeting_->setText("Hello there, " + nameEdit_->text());

WApplication *createApplication(const WEnvironment& env)
   * You could read information from the environment to decide whether
   * the user has permission to start a new application
  return new HelloApplication(env);

int main(int argc, char **argv)
   * Your main method may set up some shared resources, but should then
   * start the server application (FastCGI or httpd) that starts listening
   * for requests, and handles all of the application life cycles.
   * The last argument to WRun specifies the function that will instantiate
   * new application objects. That function is executed when a new user surfs
   * to the Wt application, and after the library has negotiated browser
   * support. The function should return a newly instantiated application
   * object.
  return WRun(argc, argv, &createApplication);








In a terminal, I checked if stat was present:



The following screen output convinced me it was:


stat: missing operand
Try `stat --help' for more information.


Obtaining the version of stat:


richel@richel1-desktop:~$ stat --version


Resulting in the following screen output, convincing me to have version 8.5 of stat:


stat (GNU coreutils) 8.5
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Michael Meskes.


Adding some linker flags, by adding the lines below to the project file, does not solve the problem:


  --docroot=. \
  --http-server= \








The program needs to have arguments supplied. Add the following arguments to the Run Settings:


--docroot . --http-address --http-port 8080







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

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