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1

Graphics / Linking error (LNK 2019) with sf::Sprite

« on: November 02, 2018, 09:58:16 pm »

After working with a project for quite while now using SFML these come up.

Code: [Select]


Severity    Code    Description    Project    File    Line    Suppression State
Error    LNK2019    unresolved external symbol "declspec(dllimport) public: thiscall sf::Sprite::Sprite(class sf::Sprite &&)" (imp_??0Sprite@sf@@QAE@$$QAV01@@Z) referenced in function "public: thiscall Boss2::Undead::Undead(class Boss2::Undead &&)" (??0Undead@Boss2@@QAE@$$QAV01@@Z)    Somber    C:\Users\\Documents\Visual Studio 2017\TEAM\Somber\Boss2.obj    1
Severity    Code    Description    Project    File    Line    Suppression State
Error    LNK2019    unresolved external symbol "declspec(dllimport) public: class sf::Sprite & thiscall sf::Sprite::operator=(class sf::Sprite &&)" (imp_??4Sprite@sf@@QAEAAV01@$$QAV01@@Z) referenced in function "public: class Boss2::Undead & thiscall Boss2::Undead::operator=(class Boss2::Undead &&)" (??4Undead@Boss2@@QAEAAV01@$$QAV01@@Z)    Somber    C:\Users\\Documents\Visual Studio 2017\TEAM\Somber\Boss2.obj    1

Here Undead is a class with a constructor like,

Code: [Select]

Undead(sf::Texture *texture1, sf::Texture *texture2, sf::Texture *texture3);
It has an sf::Sprite member. This sets one of the 3 textures to the sprite member based on some internal calculations.
Then I've used a vector of it (in another class/file) and pushed versions of it like this

Code: [Select]

std::vector <Undead> zombies;
zombies.push_back(Undead(&undeadTexture1, &undeadTexture2, &undeadTexture3));

What's worse is that it compiles and runs fine on my friends computer. The same code. I've tried to mimic all configurations his VS / SFML setup has to no avail. I even re-downloaded and setup SFML.

Few things:
1. SFML version : 2.5.0
2. Visual Studio 2017
3. I've not set SFML_STATIC (I don't want or need static linking)
4. All the sfml dlls are in the folder where the .exe file is supposed to be
5. I haven't faced this issue before in SFML and I've been using SFML for quite a while now.
(provided I did not have to make a vector of objects with sf::Sprite objects as members)
6. It works fine on my friends computer (same SFML version and VS)

2

System / Clock::getElapsedTime() with asMilliseconds() causing weird behaviour

« on: September 10, 2018, 02:50:59 pm »

When using the Clock::getElapsedTime() or restart() I noticed something weird.

        RenderWindow window(VideoMode(700, 700), "Hello SFML");
        Event event;
        Clock clock;
        Clock clock2;
        Clock c3;
       
        RectangleShape box(Vector2f(20, 20));

        //window.setFramerateLimit(30);

        while (window.isOpen())
        {      
                while (window.pollEvent(event))
                {
                        if (event.type == Event::EventType::Closed)
                        {
                                window.close();
                        }
                }
                box.move(0, 0.5 * clock.restart().asMilliseconds());
                clock.restart();

                if (box.getPosition().y > 700)
                {
                        cerr << clock2.getElapsedTime().asSeconds() << endl;
                        window.close();
                }

                window.clear();

                window.draw(box);

                window.display();
        }
 

The code seems simple enough it outputs how much the box takes to move across the screen. Moving a box to down. I was trying to implement frame rate independent movement. This produces weird jagged movement. And the measured time varying at each run (3-6 seconds). So I decided to measure the elapsed time to see whats going on.

        box.move(0, 0.5 * clock.getElapsedTime().asMilliseconds());
        cerr << clock.restart().asMilliseconds() << endl;
 

Suddenly the movement was fixed and the time taken seemed to average to around 1.76 seconds.
This was so at any framerate I set (as it should be). But as soon as i commented out the second line the same happened again.
What's even more weird is that this doesn't seem to happen when I use asMicroseconds().
Is this me or what could be causing this. I'm running this on a Windows 10 64 bit machine (developing for 32 bit machines) if that helps.