尝试使用SFML(C++)从文件加载纹理时出错

Question

我试图使用SFML加载纹理并返回sprite，但纹理无法使用我的路径加载。完全错误表示：libc++abi: terminating with uncaught exception of type std::runtime_error: Could not find texture with path: /Users/username/Library/Developer/Xcode/DerivedData/Test-eqrudqhtua/Build/Products/Debug/Test.app/Contents/Resources/tile.png

所以我在SpriteFactory.hpp中声明

class SpriteFactory
{
//function when I load sprite for the first time
unsigned int LoadTexture(const std::string& texturePath);
//function to create a sprite
sf::Sprite GetSprite(unsigned int hash);

private:
//I’m using map to store textures
std::map<unsigned int, sf::Texture> textures;

};

这里是在SpriteFactory.cpp中的实现

unsigned int SpriteFactory::LoadTexture(const std::string& texturePath)
{

//load texture if it's not loaded and return sprite
unsigned int hash = std::hash<std::string>{}(texturePath);
//if the hash of our texturePath exist in the textures
if (textures.find(hash) == textures.end())
{
// if it doesn't exist and reaches the end before texture
if (!textures[hash].loadFromFile(texturePath));
{

throw std::runtime_error("Could not find texture with path: " + texturePath);
}
}
return hash;

}
sf::Sprite SpriteFactory::GetSprite(unsigned int hash)
{
if (textures.find(hash) == textures.end())
{
throw std::runtime_error("Could not find texture with hash: " + hash);
}
return sf::Sprite(textures[hash]);
}

当我把上面的代码部分放在评论中时，就会出现黑屏。

在我的main.cpp中，我加载初始精灵纹理

unsigned int tile = factory.LoadTexture(resourcePath() + "tile.png");
unsigned int tile_hl = factory.LoadTexture(resourcePath() + "tile.png");

然后我创建一个精灵表

Tile tilePart(factory.GetSprite(tile), factory.GetSprite(tile_hl),
sf::Vector2f(100.f, 100.f));
//draw it on screen
tilePart.Draw(window);
window.display();

我的Tile.cpp部分实现在这里

Tile::Tile(sf::Sprite tile, sf::Sprite tile_hl, sf::Vector2f pos)
{
this->tile = tile;
this->tile_hl = tile_hl;
isHighlighted = (int)(pos.x /32) % 2 == 0;
//set position of a sprite
tile.setPosition(pos);

//reference points to address, tile I'm gonna to render
activeTile = isHighlighted ? &this->tile_hl : &this->tile;
}
Tile::Tile(const Tile& other)
{
tile = other.tile;
tile_hl = other.tile_hl;

isHighlighted = other.isHighlighted;
activeTile = isHighlighted ? &tile_hl : &tile;
}
void Tile::Draw(sf::RenderWindow& window)
{
if (isHighlighted)
{
activeTile = &this->tile_hl;
}

window.draw(*activeTile);
activeTile = &this->tile;
}
//whether we check highlights it will be set here
void Tile::SetHighlighted(bool flag)
{
// isHighlighted = flag;
}

你能帮我查一下我漏掉了哪一部分吗。路径是正确的，我尝试了很多不同的方法：绝对路径，我检查了我的图像等。

Answer 1

通过调试，我在LoadTexture函数实现中发现了一个问题。我的图像加载良好。问题是用loadFromFile从文件加载纹理(我没有加载纹理(。如果loadFromFile为真，则应返回hash。只有在未加载的情况下，才会返回错误。这是我的工作代码：

unsigned int SpriteFactory::LoadTexture(const std::string& texturePath)
{
unsigned int hash = std::hash<std::string>{}(texturePath);
if (textures.find(hash) == textures.end())
{
if (textures[hash].loadFromFile(texturePath));
{

return hash;
}
}
if (!textures[hash].loadFromFile(texturePath)) {
throw std::runtime_error("Could not find texture with path: " + texturePath);
}
}