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    <blockquote> <p>SFML is statically linked both in the DLL project and the project which uses it.</p> </blockquote> <p>If you do indeed link SFML statically against your DLL, then you'll have a problem, because now your finally application holds a copy of SFML and your DLL holds a copy of SFML. Thus allocated stuff by SFML in the DLL won't be necessarily available in the application and the other way around.</p> <p>AS a solution you can only link everything dynamic or everything static in the final application. This means you either use the dynamic libraries of SFML or you link your library static as well and only link against SFML static in your application and not in your library.</p> <p>Since you're using VS 2013 you'll also have to rebuild SFML itself and if you use the latest version the statically linking has changed (<a href="http://en.sfml-dev.org/forums/index.php?topic=9362.0" rel="nofollow">full discussion</a>). So here's some ASCII art for how it would work with SFML 2.0 or 2.1.</p> <pre><code> winmm gdi32 opengl / \ | / / \ | / v v v v sfml-system-s sfml-window-s | | | | | +---------------+ | | | | | +---------+ | | | | | | v v v v example.exe &lt;--- yourlib.dll </code></pre> <p>With SFML from source (target 2.3), it would looks something like this.</p> <pre><code> sfml-system-s sfml-window-s winmm gdi32 opengl | | | | | +------------+ +-------+ | | | | | | +-----------------+ | | | +-----------+ | +-----------------------+ | | | | | | | +----------------------------+ | | | | | | | v v v v v v v yourlib.dll -&gt; example.exe </code></pre> <p>What you essentially want however is this:</p> <pre><code>sfml-system-s sfml-window-s winmm gdi32 opengl yourlib-s | | | | | | | +-------+ | | | | | | +-----------------+ | | | | | | +-----------------------+ | | | | | | +----------------------------+ | | | | | | +----------------------------------+ | | | | | | v v v v v v example.exe </code></pre> <p>Dynamic linking essentially works already like the last diagram (just different), thus the dynamic linking works fine "out of the box".</p> <p>There's a lot of information around the web how linking works etc. One example would be <a href="http://en.sfml-dev.org/forums/index.php?topic=7281.msg48091#msg48091" rel="nofollow">this forum post</a>.</p>
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    1. POCan't use my own DLL which uses SFML
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    1. POCan't use my own DLL which uses SFML
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    1. COThanks. I tried link everything dynamically and it works. Never thought it was the problem of static linking and dynamic linking... Should have a deeper understanding of how the linking works.
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    2. COI'm glad it works now. I've added some diagrams to maybe help you understand what's going on. Also if you consider it as answer, please mark it as such.
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    3. COInteresting and easy-to-understand graphs, thanks.
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