std::ANYTHING is not declared - c++

Question

I ended up formatting the computer to ubuntu 16.04
Solutions I've tried based on the answers:
Just deleted 'using namespace std;' line and didn't work.
I put that line before and after '#include ', neither
worked.
Thanks Yksisarvinen
Deleted all files other than QT's defaults app (and the images, of course)
tried this, but got the same error
//#include "mainwindow.h"
//#include <QApplication>
#include <QtCore>
int main() { qDebug() << "Hello, world!"; }
/*
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
*/
Thanks Kuba Ober
Added the following line to the .pro file. This solution worked for compiling using QT
INCLUDEPATH +=/usr/include
but I still can't compile using the terminal (this is a part of my history)
cat main.cpp
g++ main.cpp
echo $LD_LIBRARY_PATH
g++ main.cpp
LD_LIBRARY_PATH='' g++ main.cpp
export LD_LIBRARY_PATH=''
echo $LD_LIBRARY_PATH
g++ main.cpp
ls /usr/include/c++/7/
echo $CXX
echo $CC
echo $CC=clang
export CC=clang
export CXX=clang++
echo $CC=clang
echo $CC
g++ main.cpp
echo $INCLUDEPATH
export INCLUDEPATH = /usr/include
export INCLUDEPATH=/usr/include
echo $INCLUDEPATH
ls
g++ main.cpp
echo $INCLUDEPATH
history
I can work now (and probably I'll format ubuntu on vacations), but I don't want to mark this as solved since there is still something not working propperly.
Thanks Marcelo Cardenas (a friend from university)
Thanks for the tips anyway, hope we can solve this
I have this QT app:
https://drive.google.com/file/d/15d4mYLgJcKOB5tpEwfuFBPXETUbR8CFK/view?usp=sharing
Which used to work. Now I'm getting
this.
500+ errors of supposedly supposedly undefined functions.
I don't know where to even look for the error.
I'm currently working with:
OS: Ubuntu 18.04.1 LTS
Kernel: 4.16.0-041600-generic
Cuda: Built on Tue_Jun_12_23:07:04_CDT_2018 Cuda compilation tools,
release 9.2, V9.2.148
gcc: (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
QMake: version 3.1
Qt version: 5.9.6
OpenGL version: 3.0 Mesa 18.0.5
OpenCV version: 4.0.0 (obtained by the command cat
/home/pablo/OpenCV-3.0.0/OpenCV-3.0.0-master/opencv/build/OpenCVConfig.cmake
)
Here is the .pro file:
#-------------------------------------------------
#
# Project created by QtCreator 2018-10-31T18:03:31
#
#-------------------------------------------------
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = Ayudantia2
TEMPLATE = app
# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
CONFIG += c++11
SOURCES += \
main.cpp \
mainwindow.cpp
HEADERS += \
mainwindow.h
FORMS += \
mainwindow.ui
And the header
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <ui_mainwindow.h>
#include <set>
//#include <mainwindow.h>
#include <QMainWindow>
#include <QFileDialog> //para buscar archivos por ventana
#include <QMessageBox> //para mensajes del sistema
#include <QImage> //para manipular imagenes basicamente(mas fome que opencv)
#include <cstdlib>
using namespace std;
#include <iostream>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();
public slots:
void cargarTexto(QString);
void cargarImagen(int area);
void buscarImagen1();
void buscarImagen2();
void buscarImagen3();
void mostrarImagen4();
void mostrarImagen5();
void mostrarImagen6();
void filtrarImagen();
void ponderar();
void colorPlano();
signals:
void textoListo(QString);
int imagenLista(int);
int filtrar1(int);
int filtrar2(int);
int filtrar3(int);
int valueChanged();
void cambiocolor();
QString ruta1(QString);
QString ruta2(QString);
QString ruta3(QString);
private slots:
private:
Ui::MainWindow *ui;
QImage imagenes[8];
};
#endif // MAINWINDOW_H
and this id the mainWindow
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget* parent):
QMainWindow(parent),
ui(new Ui::MainWindow){
ui->setupUi(this);
QObject::connect(ui->actionCargar_imagen_1, SIGNAL(triggered()),this, SLOT(buscarImagen1()));
QObject::connect(ui->actionCargar_imagen_2, SIGNAL(triggered()),this, SLOT(buscarImagen2()));
QObject::connect(ui->actionCargar_imagen_3, SIGNAL(triggered()),this, SLOT(buscarImagen3()));
QObject::connect(ui->Fusion, SIGNAL(valueChanged(int)),this, SLOT(ponderar()));
QObject::connect(this, SIGNAL(filtrar1(int)),this, SLOT(mostrarImagen4()));
QObject::connect(this, SIGNAL(filtrar2(int)),this, SLOT(mostrarImagen5()));
QObject::connect(this, SIGNAL(filtrar3(int)),this, SLOT(mostrarImagen6()));
QObject::connect(this, SIGNAL(imagenLista(int)),this, SLOT(cargarImagen(int)));
QObject::connect(ui->btn_Filtrar, SIGNAL(released()),this, SLOT(filtrarImagen()));
QObject::connect(ui->RedSlider, SIGNAL(valueChanged(int)),this,SLOT(colorPlano()));
QObject::connect(ui->BlueSlider, SIGNAL(valueChanged(int)),this,SLOT(colorPlano()));
QObject::connect(ui->GreenSlider, SIGNAL(valueChanged(int)),this,SLOT(colorPlano()));
QObject::connect(this, SIGNAL(cambiocolor()),this, SLOT(mostrarImagen7()));
QImage imagenes[8];
for(int i=0;i<8;i++){
imagenes[i]=QImage();
}
}
////////////////////////////////////////////////////////////////
void MainWindow::buscarImagen1(){
QString fileName = QFileDialog::getOpenFileName(this, tr("Abrir Imagen"), "./", tr("Imagen (*.png *.jpg *.jpeg *.bmp *.ppm);; All files (*.*)"));
if(fileName == "") return;
//emit ruta1(fileName);
emit textoListo(fileName);
imagenes[0] = QImage(fileName);
imagenes[0]= imagenes[0].scaled(170,170);
if(imagenes[0].isNull()){
QMessageBox::information(this, tr("Error de carga!!"),tr("No se puede cargar %1. ").arg(fileName));
imagenes[0] = QImage();
return;
}
ui->Ruta1->setText(fileName);
emit imagenLista(0);
}
void MainWindow::buscarImagen2(){
QString fileName = QFileDialog::getOpenFileName(this, tr("Abrir Imagen"), "./", tr("Imagen (*.png *.jpg *.jpeg *.bmp *.ppm);; All files (*.*)"));
if(fileName == "") return;
//emit ruta2(fileName);
emit textoListo(fileName);
imagenes[1] = QImage(fileName);
imagenes[1]= imagenes[1].scaled(170,170);
if(imagenes[1].isNull()){
QMessageBox::information(this, tr("Error de carga!!"),tr("No se puede cargar %1. ").arg(fileName));
imagenes[1] = QImage();
return;
}
ui->Ruta2->setText(fileName);
emit imagenLista(1);
}
void MainWindow::buscarImagen3(){
QString fileName = QFileDialog::getOpenFileName(this, tr("Abrir Imagen"), "./", tr("Imagen (*.png *.jpg *.jpeg *.bmp *.ppm);; All files (*.*)"));
if(fileName == "") return;
//emit ruta3(fileName);
emit textoListo(fileName);
imagenes[2] = QImage(fileName);
imagenes[2]= imagenes[2].scaled(170,170);
if(imagenes[2].isNull()){
QMessageBox::information(this, tr("Error de carga!!"),tr("No se puede cargar %1. ").arg(fileName));
imagenes[2] = QImage();
return;
}
ui->Ruta3->setText(fileName);
emit imagenLista(2);
}
///////////////////////////////////////////////////////////////
void MainWindow::mostrarImagen4(){
emit imagenLista(4);
}
void MainWindow::mostrarImagen5(){
emit imagenLista(5);
}
void MainWindow::mostrarImagen6(){
emit imagenLista(6);
}
///////////////////////////////////////////////////////////////scrollArea_1
void MainWindow::cargarTexto(QString texto){
ui->Ruta1->setText(texto);
}
///////////////////////////
void MainWindow::cargarImagen(int area) {
QImage *out = new QImage(imagenes[area]);
QLabel *label = new QLabel;
label->setPixmap(QPixmap::fromImage(*out, Qt::AutoColor));
if (area == 0) ui->scrollArea_1->setWidget(label);
if (area == 1) ui->scrollArea_2->setWidget(label);
if (area == 2) ui->scrollArea_3->setWidget(label);
if (area == 3) ui->scrollArea_4->setWidget(label);
if (area == 4) ui->scrollArea_5->setWidget(label);
if (area == 5) ui->scrollArea_6->setWidget(label);
if (area == 6) ui->scrollArea_7->setWidget(label);
if (area == 7) ui->scrollArea_8->setWidget(label);
}
//////////////////////////////////////////////////////////////
void MainWindow::filtrarImagen(){
int R,G,B;
QColor pixelRGB;
imagenes[4]=imagenes[0];
if(imagenes[4].isNull()) imagenes[4] = QImage();
imagenes[5]=imagenes[1];
if(imagenes[5].isNull()) imagenes[5] = QImage();
imagenes[6]=imagenes[2];
if(imagenes[6].isNull()) imagenes[6] = QImage();
for(int k=0;k<3;k++){
if (imagenes[k].isNull()) continue;
for(int i=0;i<imagenes[k].height();i++){
for(int j=0;j<imagenes[k].width();j++){
pixelRGB=imagenes[k].pixelColor(i,j);
R = pixelRGB.red();
G = pixelRGB.green();
B = pixelRGB.blue();
if(ui->Tresched_chBox->isChecked()){
if(R < ui->RedSlider->value()){
R=0;
}
if(G < ui->GreenSlider->value()){
G=0;
}
if(B < ui->BlueSlider->value()){
B=0;
}
}
if(ui->Tresched_chBox->isChecked()==false){
if(R > ui->RedSlider->value()){
R=0;
}
if(G > ui->GreenSlider->value()){
G=0;
}
if(B > ui->BlueSlider->value()){
B=0;
}
}
//printf("(%i,%i,%i)",R,G,B);
imagenes[k+4].setPixelColor(i,j,QColor(R,G,B,0));
}
}
}
emit filtrar1(4);
emit filtrar2(5);
emit filtrar3(6);
}
//////////////////////////////////////////////////////////////
void MainWindow::ponderar(){
if((imagenes[1].isNull() == false) and (imagenes[2].isNull() == false)){
imagenes[3] = imagenes[2];
float ponderacion = (float) ui->Fusion->value();
QColor pixelRGB1,pixelRGB2;
int R1,G1,B1,R2,G2,B2,R3,G3,B3;
int alfa1,alfa2,alfa3;
for(int i=0;i<imagenes[1].height();i++){
for(int j=0;j<imagenes[1].width();j++){
pixelRGB1=imagenes[1].pixelColor(i,j);
R1 = pixelRGB1.red();
G1 = pixelRGB1.green();
B1 = pixelRGB1.blue();
alfa1 = pixelRGB1.alpha();
pixelRGB2=imagenes[2].pixelColor(i,j);
R2 = pixelRGB2.red();
G2 = pixelRGB2.green();
B2 = pixelRGB2.blue();
alfa2 = pixelRGB2.alpha();
R3=(R1*ponderacion/100.0 + R2*(100.0-ponderacion)/100.0);
G3=(G1*ponderacion/100.0 + G2*(100.0-ponderacion)/100.0);
B3=(B1*ponderacion/100.0 + B2*(100.0-ponderacion)/100.0);
alfa3=(alfa1*ponderacion/100.0 + alfa2*(100.0-ponderacion)/100.0);
//printf("(%i,%i,%i)",R3,G3,B3);
imagenes[3].setPixelColor(i,j,QColor(R3,G3,B3,alfa3));
}
}
emit imagenLista(3);
}
}
//////////////////////////////////////////////////////////////
void MainWindow::colorPlano(){
imagenes[7] = QImage(175,175,QImage::Format_RGB32);
int R,G,B;
R = ui->RedSlider->value();
G = ui->GreenSlider->value();
B = ui->BlueSlider->value();
for(int i=0;i<imagenes[7].height();i++){
for(int j=0;j<imagenes[7].width();j++){
imagenes[7].setPixelColor(i,j,QColor(R,G,B));
}
}
emit cambiocolor();
emit imagenLista(7);
}
//////////////////////////////////////////////////////////////
MainWindow::~MainWindow(){
delete ui;
}
/////////////////////////////////////////////
The rest of the code is on the link on the top of this question.
Thank you for helping me, I'm new to Ubuntu, qt and C++ and I want to improve, but it's quite frustrating when every solution generates another error.

Answer 1

It seems that your source folder contains obsolete build products from another system. Modern Qt Creator never puts those output files inside of the source folders. Close Qt Creator, then remove all files other than the below:
Ayudantia2.pro
main.cpp
mainwindow.cpp
mainwindow.h
mainwindow.ui
marge.jpeg
pdi.jpeg
The files above must be the only files left in the source folder. Make sure you don't miss the hidden files, specifically remove:
.qmake.stash remove
Then open Qt Creator, open the project, configure it for the current Qt version, and attempt building again.