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General / sf::Image::loadFromMemory read access violation

« on: July 18, 2022, 07:41:25 pm »

so what im trying to do is take a screenshot from the entire screen(not only from sfml window) and saving it to memory to then save to a file (i am trying to just save to memory but to debug i am saving) and it gives me the error at the title (i am only using 1 file for a while)

#include "functions.h"
#include <SFML/Graphics.hpp>
#include <SFML/Network.hpp>
#include <Windows.h>

#undef IS_USING_TEXT

void* screenCapturePart() {
        HDC hdcSource = GetDC(NULL);
        HDC hdcMemory = CreateCompatibleDC(hdcSource);

        int capX = GetDeviceCaps(hdcSource, HORZRES);
        int capY = GetDeviceCaps(hdcSource, VERTRES);

        HBITMAP hBitmap = CreateCompatibleBitmap(hdcSource, 1920, 1080);
        HBITMAP hBitmapOld = (HBITMAP)SelectObject(hdcMemory, hBitmap);

        BitBlt(hdcMemory, 0, 0, 1920, 1080, hdcSource, 0, 0, SRCCOPY);
        hBitmap = (HBITMAP)SelectObject(hdcMemory, hBitmapOld);

        return hBitmap;
}

int WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
{
#ifdef IS_USING_TEXT
        static auto defFont = new sf::Font;
        defFont->loadFromFile("Roboto-Regular.ttf");
#endif // IS_USING_TEXT

        sf::RenderWindow window(sf::VideoMode(800u, 800u), "SFML", sf::Style::Close);
        window.setVerticalSyncEnabled(true);
        sf::Event evnt;

        sf::Image screenshot;
        screenshot.loadFromMemory(screenCapturePart(), (size_t)1920 * 1080 * sizeof(sf::Color));

        if (screenshot.saveToFile("z.bmp"))
                window.close();

        while (window.isOpen())
        {
               

                ProcessEvents(window, evnt);
                window.clear();
               
                window.display();
        }
       
#ifdef IS_USING_TEXT
        delete defFont;
#endif // IS_USING_TEXT
        return 0;
}

2

Window / nothing is moving on screen

« on: January 17, 2022, 08:13:22 pm »

I want to make a pong game purely to practice since i am a beginner in programming, but nothing is moving on screen. Can someone help me fix this?

#include "game.h"
#include <SFML/Graphics.hpp>

bool game::isClosing()
{
        while (this->Game.isOpen())
        {
                while (this->Game.pollEvent(this->event))
                {
                        if (this->event.type == sf::Event::Closed)
                        {
                                return true;
                        }
                }
        }
        return false;
}

void game::resetGame()
{
        Ball.circle.setPosition(this->Game.getSize().x / 2.0f, this->Game.getSize().y / 2.0f);
        player1.rectangle.setPosition(player1.rectangle.getPosition().x, 450);
        player2.rectangle.setPosition(player2.rectangle.getPosition());
}

void game::render()
{
        this->Game.clear();

        this->Game.draw(Ball.circle);
        this->Game.draw(player1.rectangle);
        this->Game.draw(player2.rectangle);

        this->Game.display();
}

void game::run()
{
        while (this->Game.isOpen())
        {
                player1.movement();
                player2.movement();
                Ball.movement();
                Ball.bounce(player1);
                Ball.bounce(player2);

                this->render();

                if (this->isClosing())
                {
                        this->Game.close();
                }
        }
}

#include "player.h"
#include <SFML/Graphics.hpp>

void player::movement()
{
        switch (this->side)
        {
        case 'l':
                if (sf::Keyboard::isKeyPressed(sf::Keyboard::W))
                {
                        this->rectangle.move(0, -this->speed);
                }
                else if (sf::Keyboard::isKeyPressed(sf::Keyboard::S))
                {
                        this->rectangle.move(0, this->speed);
                }
                break;

        case 'r':
                if (sf::Keyboard::isKeyPressed(sf::Keyboard::Up))
                {
                        this->rectangle.move(0, -this->speed);
                }
                else if (sf::Keyboard::isKeyPressed(sf::Keyboard::Down))
                {
                        this->rectangle.move(0, this->speed);
                }
                break;

        default:
                break;
        }
}

#include "ball.h"
#include <SFML/Graphics.hpp>

void ball::movement()
{
        this->circle.move(this->xSpeed, this->ySpeed);
}

void ball::bounce(const player& player)
{
        if (this->circle.getGlobalBounds().intersects(player.rectangle.getGlobalBounds()))
        {
                if (this->ySpeed < 0)
                {
                        if (this->circle.getPosition().y < player.rectangle.getPosition().y)
                        {
                                this->xSpeed *= -1;
                        }
                        else if (this->circle.getPosition().y > player.rectangle.getPosition().y)
                        {
                                this->xSpeed *= -1;
                                this->ySpeed *= -1;
                        }
                }
                else if (this->ySpeed > 0)
                {
                        if (this->circle.getPosition().y < player.rectangle.getPosition().y)
                        {
                                this->xSpeed *= -1;
                                this->ySpeed *= -1;
                        }
                        else if (this->circle.getPosition().y > player.rectangle.getPosition().y)
                        {
                                this->xSpeed *= -1;
                        }
                }
        }
}