设置QTimer间隔时QT应用程序崩溃

Qt Application crash when setting QTimer interval

本文关键字:QT 应用程序 崩溃 QTimer 设置      更新时间:2023-10-16

这是我的第一个问题,是我注册到网站的原因。我正在使用QT 5.9开发游戏,并使用QTimer在屏幕上产生敌人。每次调用计时器的超时功能时,都会产生敌人。我尝试做的是,如果玩家杀死了10个敌人,则计时器间隔会减少,因此敌人会更频繁地产卵,从而使游戏更具挑战性。第一次设置计时器间隔时,游戏运行完美,但是第二次调用setInterval()方法,当玩家杀死10个敌人时,游戏突然崩溃了。我尝试调试它以找出可能导致它的原因,并且当我尝试设置SpawnInterval时,它似乎崩溃了。我是编码的新手,因此对任何建议都表示赞赏!这是我的代码中的相关源文件和代码:

main.cpp

#include <QApplication>
#include <game.h>
Game * game;
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    game = new Game();
    game->show();
    return a.exec();
}

game.h:

#include <QGraphicsScene>
#include <QWidget>
#include <QGraphicsView>
#include "Player.h"
#include "score.h"
#include "Health.h"
class Game: public QGraphicsView{
public:
    Game(QWidget * parent=0);
    QGraphicsScene * scene;
    Player * player;
       Score * score;
       Health * health;
       void setSpawnInterval(int spawnValue);
       int getSpawnInterval();
        void setTimerInterval();
private:
       int spawnInterval = 1000;
};
#endif // GAME_H

game.cpp:

QTimer * timer1 = new QTimer();
QObject::connect(timer1,SIGNAL(timeout()),player,SLOT(spawn()));
timer1->start(getSpawnInterval());
}
void Game::setSpawnInterval(int spawnValue){
 //this is the part where it crashes
spawnInterval = spawnValue;
}
int Game::getSpawnInterval(){
    return spawnInterval;
}

得分.h

#ifndef SCORE_H
#define SCORE_H
#include <QGraphicsTextItem>
class Score: public QGraphicsTextItem{
public:
    Score(QGraphicsItem * parent=0);
    void increase();
    int getScore();
private:
    int score;
};
#endif // SCORE_H

score.cpp

#include "score.h"
#include <QFont>
#include "game.h"
#include <QTimer>
void Score::increase()
{
    score++;
    if(score > 3){
    Game * game;
        game->setSpawnInterval(200);}
    //Draw the text to the display
    setPlainText(QString("Score: ") + QString::number(score));
}
int Score::getScore()
{
    return score;
}

player.h

    #ifndef PLAYER_H
#define PLAYER_H
#include <QGraphicsRectItem>
#include <QEvent>
#include <QObject>
class Player: public QObject, public QGraphicsRectItem{
    Q_OBJECT
public:
     Player(QGraphicsItem * parent=0);
   void keyPressEvent(QKeyEvent * event);
    int jumpPhaseNumber = 0;
    bool jumpRun = false;
public slots:
   void spawn();
   void jumpPhase();
};
#endif

player.cpp

void Player::spawn()
{
    Enemy * enemy = new Enemy();
    scene()->addItem(enemy);
}

似乎您正在创建两个类别game的实例。

我建议您使用静态变量从多类访问。

将此类添加到您的项目:

.cpp

#include "settings.h"
int Settings::spawnInterval = 1000;
Settings::Settings(QObject *parent) : QObject(parent)
{
}

.h

#ifndef SETTINGS_H
#define SETTINGS_H
#include <QObject>
#include <QString>
class Settings : public QObject
{
    Q_OBJECT
public:
    explicit Settings(QObject *parent = 0);
    static int spawnInterval;
};
#endif // SETTINGS_H

现在,我们有一个静态变量名称spawnInterval,您可以从包含这样的设置类的任何类中访问(set/get):

#include <settings.h>
Settings::spawnInterval = 100; // set
int value = Settings::spawnInterval; //get

此行:Game * game; game->setSpawnInterval(200)导致您的程序崩溃:必须初始化游戏指针;例如,为了解决此问题,您可以在分数类中保存游戏的参考(指针),从而让您调用SetSpawnInterval;我将在游戏的构造函数中构建分数将this作为参数传递;如@aghilpro所建议,这可以使您免于创建新类。实际上,struct会更好,因为您的信息是公开的,并且可以从其他类中访问,而无需实现Geters/setter。