My Window don't show when I start the .exe file

[Madtre]

Hi,
So I've made a project, it works when I run it in qtcreator. When I try to start it with the .exe (I added the .dll in the folder) it works well, but nothing shows. I can see it in the task manager, it's not using my processor (it says 0%). I'm on windows 10.
The code is the following :

#include <QApplication>
#include <window.h>
#include <QDesktopWidget>
#include <updatemanager.h>
using namespace std;

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QRect rec = QApplication::desktop()->screenGeometry();
    int height = rec.height();
    int width = rec.width();
    window *win = new window(width,height);
    UpdateManager up(win);
    up.start();
    return app.exec();
}

#ifndef SCORENUM_H
#define SCORENUM_H

#include <QLabel>
#include <QWidget>
class ScoreNum : public QLabel
{
    Q_OBJECT
public:
    ScoreNum(QWidget* parent,int x, int y);
    void SetScore(int sc);
    int GetScore();
private:
    int score;
};

#endif // SCORENUM_H

#include "scorenum.h"

ScoreNum::ScoreNum(QWidget* parent,int x, int y) : QLabel(parent)
{
    score = 0;
    setNum(score);
    QFont font("Arial",50);
    setFont(font);
    setGeometry(x,y,100,100);
}
void ScoreNum::SetScore(int sc) {
    score = sc;
    setNum(score);
}
int ScoreNum::GetScore() {
    return score;
}

#ifndef UPDATEMANAGER_H
#define UPDATEMANAGER_H
#
#include <atomic>
#include <chrono>
#include <iostream>
#include <thread>
#include <window.h>
#include <chrono>
#include <QObject>
class UpdateManager : public QObject
{
    Q_OBJECT
public :
    UpdateManager(window* window);
    void start();
    void stop();
    void task();
private :
    bool running;
    std::thread t;
    window* win;
signals:
    void Updating();
};

#endif // UPDATEMANAGER_H

#include "updatemanager.h"

UpdateManager::UpdateManager(window* window){
    win = window;
}
void UpdateManager::start()
{
    running = true;
    std::thread t(&UpdateManager::task,this);
    t.detach();
    QObject::connect(this,SIGNAL(Updating()),win,SLOT(updateScreen()));
}
void UpdateManager::stop() {
    running = false;
    t.join();
}
void UpdateManager::task() {
    while(running) {
        if(win->GetRunning()) {
            win->TranslateBalle();
        }
        win->CheckKey();
        emit Updating();
        std::this_thread::sleep_for(std::chrono::milliseconds(8));
    }
}

#ifndef WINDOW_H
#define WINDOW_H

#include <QWidget>
#include <QPainter>
#include <QKeyEvent>
#include <scorenum.h>
#include <vector>
class window : public QWidget
{
    Q_OBJECT
public:
    window(int width,int height);
    void TranslateBalle();
    void paintEvent(QPaintEvent *event) override;
    void keyPressEvent(QKeyEvent *k) override;
    void keyReleaseEvent(QKeyEvent *k) override;
    void Move();
    void Thread();
    bool CheckIfOut(int posX,int posY, int x, int y, int scaleX, int scaleY);
    bool CheckCollision(int x1, int y1, int x2, int y2, int x3, int y3);
    void Won(std::string side);
    void CheckKey();
    bool GetRunning();
private:
    double sizeX;
    double sizeY;
    double posYRect1;
    double posYRect2;
    bool running;
    double _posX;
    double _posY;
    double _scaleX;
    double _scaleY;
    double _moveX;
    double _moveY;
    double rectangle1[4];
    double rectangle2[4];
    ScoreNum* score1;
    ScoreNum* score2;
    std::vector<int> keys;
public slots:
    void updateScreen();
};

#endif // WINDOW_H

#include "window.h"
window::window(int width,int height) : QWidget(), sizeX(width), sizeY(height), running(false)
{
    posYRect1 = 10;
    posYRect2 = 10;
    _scaleX = floor(sizeY/50);
    _scaleY = floor(sizeY/50);
    _posX = floor((sizeX-_scaleX)/2);
    _posY = floor((sizeY-_scaleY)/2);
    _moveX = 10;
    _moveY = 10;
    score1 = new ScoreNum(this,sizeX/2-sizeX/10,sizeY/100);
    score2 = new ScoreNum(this,sizeX/2+sizeX/10,sizeY/100);
    showFullScreen();
}
void window::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.fillRect(0,0,sizeX,sizeY,Qt::darkGray);
    rectangle1[0] = 10;
    rectangle1[1] = posYRect1;
    rectangle1[2] = sizeX/100;
    rectangle1[3] = sizeY/5;
    painter.fillRect(rectangle1[0],rectangle1[1],rectangle1[2],rectangle1[3],Qt::red);
    rectangle2[0] = sizeX-15;
    rectangle2[1] = posYRect2;
    rectangle2[2] = sizeX/100;
    rectangle2[3] = sizeY/5;
    painter.fillRect(rectangle2[0],rectangle2[1],rectangle2[2],rectangle2[3],Qt::red);
    painter.fillRect(_posX,_posY,_scaleX,_scaleY,Qt::red);
}
void window::keyPressEvent(QKeyEvent *k)
{
    int key = k->key();
    bool isInside = false;
    for(int i = 0 ; i < keys.size();i++) {
        if(key==keys[i]) {
            isInside = true;
        }
    }
    if(!isInside) {
        keys.push_back(key);
    }
}
void window::keyReleaseEvent(QKeyEvent *k) {
    int key = k->key();
    for(int i = 0 ; i < keys.size();i++) {
        if(key==keys[i]) {
            keys.erase(keys.begin()+i);
        }
    }
}
void window::CheckKey() {
    for(int i = 0 ; i < keys.size() ; i++) {
        switch(keys[i]) {
            case 16777235 : {
            if (posYRect2 != 0) posYRect2 -= 5;
                break;
            }
            case 16777237 : {
            if(posYRect2 < sizeY-sizeY/5) posYRect2 += 5;
                break;
            }
            case 83 : {
            if(posYRect1 < sizeY-sizeY/5) posYRect1 += 5;
                break;
            }
            case 90 : {
            if(posYRect1 !=0) posYRect1 -=5;
                break;
            }
            case 32 : {
            if(!running)
            {
                running = true;
            }
        }
        }
    }
}
void window::TranslateBalle() {
    if(CheckIfOut(_posX,_posY,_moveX/10,_moveY/10,_scaleX,_scaleY))
    {
        _posX += _moveX/10;
        _posY += _moveY/10;
    }
}
bool window::CheckIfOut(int posX1,int posY1,int x1, int y1, int scaleX1, int scaleY1) {
    if(posX1+x1+scaleX1 > sizeX)
    {
        Won("right");
        return false;
    }
    else if(posY1+y1+scaleY1 > sizeY)
    {
        _moveY = -_moveY;
        return true;
    }
    else if(posX1 +x1 < 0)
    {
        Won("left");
        return false;
    }
    else if(posY1 + y1 < 0)
    {
        _moveY = -_moveY;
        return true;
    }
    else
    {
        if(posX1 > sizeX/2)
        {
            int posX2 = rectangle2[0];
            int posY2 = rectangle2[1];
            if(CheckCollision(posX1+scaleX1,posY1,posX2,posY2,posX2+rectangle2[2],posY2+rectangle2[3])) {
                if(CheckCollision(posX1+scaleX1,posY1+scaleY1,posX2,posY2,posX2+rectangle2[2],posY2+rectangle2[3])) {
                    _moveX = abs(int((2*posY2+rectangle2[3])/2-(2*posY1+scaleY1)/2)) * -0.9;
                    _moveY = -int((2*posY2+rectangle2[3])/2-(2*posY1+scaleY1)/2)*0.9;
                    return true;
                }
            }
        }
        else
        {
            int posX2 = rectangle1[0];
            int posY2 = rectangle1[1];
            if(CheckCollision(posX1,posY1,posX2,posY2,posX2+rectangle1[2],posY2+rectangle1[3])) {
                if(CheckCollision(posX1,posY1+scaleY1,posX2,posY2,posX2+rectangle1[2],posY2+rectangle1[3])) {
                    _moveX = abs(int((2*posY2+rectangle1[3])/2-(2*posY1+scaleY1)/2))*0.9;
                    _moveY = -int((2*posY2+rectangle1[3])/2-(2*posY1+scaleY1)/2)*0.9;
                    return true;
                }
            }
        }
    }
    return true;
}
bool window::CheckCollision(int x1, int y1, int x2, int y2, int x3, int y3) {
    if((x2<=x1 && x1<=x3) && (y2<=y1 && y1 <= y3)) {
        return true;
    }
    return false;
}
void window::Won(std::string side) {
    _posX = floor((sizeX-_scaleX)/2);
    _posY = floor((sizeY-_scaleY)/2);
    if (side=="left") {
        score2->SetScore(score2->GetScore()+1);
        _moveX = -10;
        _moveY = 0;
    }
    else if(side=="right") {
        score1->SetScore(score1->GetScore()+1);
        _moveX = 10;
        _moveY = 0;
    }
    running = false;
}
bool window::GetRunning() {
    return running;
}
void window::updateScreen() {
    repaint();
}

[sierdzio]

Open it from command line to see any errors or warnings printed by Qt. You may be missing the platform plugin - best use windeployqt to deploy your app instead of copying DLLs by hand.

[Madtre]

I fixed the problem by forcing a compiler and manually getting the dll from the correspondant compiler
Thanks for the help and reactivity