R6025纯虚拟函数调用(从sf::InputStream派生的类)

R6025 pure virtual function call (class derived from sf::InputStream)

本文关键字:InputStream 派生 sf 虚拟 函数调用 R6025      更新时间:2023-10-16

对于我的游戏,我想使用PhysFs提取zip文件中的音乐文件

我创建了一个自定义类MusicStream,它继承自sf::InputStream,用作sf::Music的流。

这是我的基本程序:

#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
#include "musicstream.h"
#include "physfs.h"
int main() {
  PHYSFS_init(0);
  PHYSFS_addToSearchPath("data.zip", 0);
  std::string musicFile = "music.ogg";
  if (PHYSFS_exists(musicFile.c_str()) == 0) {
    PHYSFS_deinit();
    return EXIT_FAILURE;
  }
  sf::RenderWindow window(sf::VideoMode(200, 200), "SFML works!");
  sf::Music myMusic;
  MusicStream myStream(musicFile.c_str());
  if (!myStream.getError()) {
    myMusic.openFromStream(myStream);
    myMusic.play();
  }
  while (window.isOpen()) { 
    sf::Event event; 
    while (window.pollEvent(event)) { 
      if (event.type == sf::Event::Closed) window.close(); 
    }
  }
  myMusic.stop();
  PHYSFS_deinit();
  return 0;
}

这是完美的工作,除了一件事:

当我关闭窗口,程序退出时,我得到一个运行时错误R6025 pure virtual function call,程序崩溃。

显然,一个纯虚拟函数被称为(sf::InputStream的dtor??),但我实现了sf::InputStream的所有函数,这对我来说没有意义

此外,我真的不确定代码是否相关,但如果相关,这是自定义类:

musicstream.h

#ifndef MUSIC_STREAM_H_INCLUDED
#define MUSIC_STREAM_H_INCLUDED
#include <SFML/System.hpp>
#include "physfs.h"
class MusicStream : public sf::InputStream {
 public:
  MusicStream();
  MusicStream(const char *fileName);
  virtual ~MusicStream() override;
  sf::Int64 read(void *data, sf::Int64) override;
  sf::Int64 seek(sf::Int64 position) override;
  sf::Int64 tell() override;
  sf::Int64 getSize() override;
  bool getError() const;
 private:
  PHYSFS_File *file_;
  bool error_;
};
#endif

musicstream.cpp

#include "musicstream.h"
MusicStream::MusicStream() :
  error_(true)
{
}
MusicStream::MusicStream(const char *filename) :
  error_(false)
{
  file_ = PHYSFS_openRead(filename);
  if (file_ == nullptr) {
    error_ = true;
  }
}
MusicStream::~MusicStream() {
  if (error_) { return; }
  PHYSFS_close(file_);
}
sf::Int64 MusicStream::read(void *data, sf::Int64 size) {
  if (error_) { return 0; }
  sf::Int64 fileRead = PHYSFS_read(file_, data, 1, size);
  if (fileRead == -1) {
    return 0;
  }
  return fileRead;
}
sf::Int64 MusicStream::seek(sf::Int64 position) {
  if (error_)  { return -1; }
  if (PHYSFS_seek(file_, position) == 0) {
    return -1;
  }
  return position;
}
sf::Int64 MusicStream::tell() {
  if (error_) { return -1; }
  sf::Int64 position = PHYSFS_tell(file_);
  return position;
}
sf::Int64 MusicStream::getSize() {
  if (error_) { return -1; }
  sf::Int64 size = PHYSFS_fileLength(file_);
  return size;
}
bool MusicStream::getError() const {
  return error_;
}

问题出在这两行:

sf::Music myMusic;
MusicStream myStream(musicFile.c_str());

我交换了它们并消除了错误。这是因为音乐是按自己的思路演奏的。它在被摧毁后试着从溪流中读出。现在音乐在流被破坏之前就被破坏了。