射弹创建期间矢量下标超出范围

Question

当我尝试在我的游戏运行

中创建射弹时，会弹出两条 Microsoft Visual C++ 运行时库消息

Debug Assertion Failed! Program: C:\WINDOWS\SYSTEM32\MSVCP120D.dll
File: c:\program files (x86)\microsoft visual studio
12.0\vc\include\vector Line:1201 Expression: vector subscript out of range

和

Debug Assertion Failed!
Program: C:\SFML-2.3.2\SFML\Debug\SFML.exe
File: c:\program files (x86)\microsoft visual studio 12.0\vc\include\vector
Line:1202
Expression: "Standard C++ Libraries Out of Range" && 0

然后是 Microsoft Visual Studio Express 2013 的消息：

Unhandled exception at 0x5B89A893 (msvcr120d.dll) in SFML.exe: An invalid parameter was passed to a function that considers invalid parameters fatal.

当我按下 space 栏来创建弹丸（绿色方块）时，就会发生这种情况。绿色方块出现在屏幕上它应该出现的位置，然后消息立即弹出。此时使用当前代码的射弹应该表现为绿色方形画笔，但会弹出此消息。这是我的源代码：

主要内容：

int main ( )

{
int counter1 = 0;
int counter2 = 0;
int counter3 = 0;

//create the main window

sf::RenderWindow window(sf::VideoMode(640, 480), "SFML Demo");

sf::Event event;

sf::Vector2i source(1, 0);

//load texture

sf::Texture texturePlayer;

if (!texturePlayer.loadFromFile("images/player.png"))
    return EXIT_FAILURE;

//class object
class player Player1;
Player1.sprite.setTexture(texturePlayer);

//Projectile vector array
vector<projectile>::const_iterator iter;
vector<projectile> projectileArray;

//projectile object

class projectile projectile1;


while ( window.isOpen() )
{
    while (window.pollEvent(event))
    {
        if ( event.type == sf::Event::EventType::Closed )
            window.close();
    }
    window.clear();

    //fire missile (space bar)
    if (sf::Keyboard::isKeyPressed(sf::Keyboard::Space))
    {
        projectile1.rect.setPosition(Player1.rect.getPosition());
        projectileArray.push_back(projectile1);
    }

    //Draw projectile
    for (iter = projectileArray.begin(); iter != projectileArray.end(); iter++)
    {
        window.draw(projectileArray[counter1].rect);
        counter1++;
    }


    //update player with rectangle collision detection
    Player1.update();  
    Player1.updateMovement();


    //window.draw(Player1.rect);
    window.draw(Player1.sprite);
    window.display();


 }

}

projectile.h

class projectile: public entity //继承自entity { public:

float movementSpeed = 10;
int attackDamage = 5;

projectile();               //constructor
//void update();
//void updateMovement();
};

#endif

projectile.cpp

    projectile::projectile() {

rect.setSize(sf::Vector2f(10.0, 10.0));

rect.setFillColor(sf::Color::Green);

rect.setPosition(0, 0);

//sprite.setTextureRect(sf::IntRect(0, 0, 32, 32)); }

我该如何解决这个问题？任何 advice/help 非常感谢。提前致谢

Answer 1

在循环中 Draw projectile 您必须像这样使用或迭代器访问 projectileArray 中的元素

for (iter = projectileArray.begin(); iter != projectileArray.end(); iter++)
{
    window.draw(iter->rect);
}

或在循环之前初始化 counter1=0; 否则在 main while 的第二次迭代中 counter1 将不会指向向量 projectileArray.

的开始

射弹创建期间矢量下标超出范围

Vector Subscript out of Range During Projectile Creation

c++

sfml

visual-studio-2013

主要内容：

projectile.h

projectile.cpp