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

January 25, 2018 · View on GitHub

 

 

 

 

 

(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)

 

IDE(s):

Project type:

  • console Console application

Compiler(s):

Libraries used:

  • Boost Boost: version 1.42
  • Qt Qt: version 4.7.0 (32 bit)
  • STL STL: GNU ISO C++ Library, version 4.4.5
  • Wt Wt: version 3.1.2

 

 

 

 

 

Project file

 

#------------------------------------------------- # # Project created by QtCreator 2010-11-18T12:10:20 # #------------------------------------------------- QT       += core QT       -= gui TARGET = CppHelloWtQtCreatorUbuntu LIBS += -L/usr/lib -lwt -lwthttp QMAKE_CXXFLAGS += -DNDEBUG CONFIG   += console CONFIG   -= app_bundle TEMPLATE = app 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 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 { public:   HelloApplication(const WEnvironment& env); private:   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())    */   nameEdit_->enterPressed().connect     (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); }

 

 

 

 

 

Process

 

In a terminal, I checked if stat was present:

stat

 

The following screen output convinced me it was:

 

stat: missing operand Try `stat --help' for more information. richel@richel1-desktop:~$

 

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:

 

 

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

 

QMAKE_LFLAGS += \   --docroot=. \   --http-server=0.0.0.0 \   --http-port=8080

 

 

 

 

 

Solution

 

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

 

--docroot . --http-address 0.0.0.0 --http-port 8080