c++ - SFML 2.4.2-绘制文本时出现段错误

Question

运行此代码时出现段错误。它可能是错误的索引，但是我感到困惑，因为我尝试访问的元素存在，如“绘制”之前的“cout”所示。

我使用GCC:g++ -std = c++ 11 ./ellipse.cpp -o ./ellipse -Wfatal-errors -lsfml-graphics -lsfml-window -lsfml-system

我会继续搜索，但会有所帮助。

最好的祝福，

MC

#include <iostream>
#include "SFML/Graphics.hpp"
using namespace std;
struct ellipse
    {
    sf::Text ellipseTitle;
    };
vector<ellipse> initialize(vector<ellipse> ellipses,unsigned short numberOfEllipses)
    {
    sf::Font myFont;
    string myfontFileName="./media/Arial.ttf";
    if (!myFont.loadFromFile(myfontFileName))
        {
        cout << "Could not find the font " << myfontFileName << endl;
        }
    ellipse e;
    e.ellipseTitle.setFont(myFont);
    e.ellipseTitle.setCharacterSize(20);
    e.ellipseTitle.setFillColor(sf::Color::White);
    for(int i=0;i<numberOfEllipses;i++)
        {
        e.ellipseTitle.setString("[Some text "+to_string(i)+"]");
        sf::FloatRect textRect = e.ellipseTitle.getLocalBounds();
        e.ellipseTitle.setOrigin(textRect.left + textRect.width/2.0f,textRect.top  + textRect.height/2.0f);
        e.ellipseTitle.setPosition(sf::Vector2f(100,100+(20*i)));
        ellipses.push_back(e);
        }
    return ellipses;
    }
int main()
    {
    sf::RenderWindow window(sf::VideoMode(640,480), "Demo",sf::Style::Default);
    unsigned short numberOfEllipses=11;
    vector<ellipse> ellipses;
    ellipses=initialize(ellipses,numberOfEllipses);
    sf::Event myEvent;
    while (window.isOpen())
        {
        while (window.pollEvent(myEvent))
            {
            if (myEvent.type == sf::Event::EventType::Closed)
                {
                window.close();
                }
            }
        window.clear();
        for(ellipse e:ellipses)
            {
            cout << "title " << e.ellipseTitle.getString().toAnsiString() << endl;
            window.draw(e.ellipseTitle);
            }
        window.display();
        }
    return EXIT_SUCCESS;
    } ```

Answer 1

真的谢谢你经过更多搜索(知道如何命名问题)，我发现这是一个非常常见的错误。这是更正的代码:

#include <stdio.h>
#include <iostream>
#include "SFML/Graphics.hpp"
using namespace std;
struct ellipse
    {
    sf::Text ellipseTitle;
    };
vector<ellipse> initialize(vector<ellipse> ellipses,unsigned short numberOfEllipses,sf::Font& myFont)
    {
    ellipse e;
    e.ellipseTitle.setFont(myFont);
    e.ellipseTitle.setCharacterSize(20);
    e.ellipseTitle.setFillColor(sf::Color::White);
    for(int i=0;i<numberOfEllipses;i++)
        {
        e.ellipseTitle.setString("[Some text "+to_string(i)+"]");
        sf::FloatRect textRect = e.ellipseTitle.getLocalBounds();
        e.ellipseTitle.setOrigin(textRect.left + textRect.width/2.0f,textRect.top  + textRect.height/2.0f);
        e.ellipseTitle.setPosition(sf::Vector2f(100,100+(20*i)));
        ellipses.push_back(e);
        }
    return ellipses;
    }
int main()
    {
    sf::RenderWindow window(sf::VideoMode(640,480), "Demo",sf::Style::Default);
    unsigned short numberOfEllipses=11;
    sf::Font myFont;
    string myfontFileName="./media/Arial.ttf";
    if (!myFont.loadFromFile(myfontFileName))
        {
        cout << "Could not find the font " << myfontFileName << endl;
        return EXIT_FAILURE;
        }
    vector<ellipse> ellipses;
    ellipses=initialize(ellipses,numberOfEllipses,myFont);
    sf::Event myEvent;
    while (window.isOpen())
        {
        while (window.pollEvent(myEvent))
            {
            if (myEvent.type == sf::Event::EventType::Closed)
                {
                window.close();
                }
            }
        window.clear();
        for(ellipse e:ellipses)
            {
            cout << "title " << e.ellipseTitle.getString().toAnsiString() << endl;
            window.draw(e.ellipseTitle);
            }
        window.display();
        }
    return EXIT_SUCCESS;
    }```