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POc++ dynamic library dlopen error
 

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    <p>I have two files: RollDice.cpp</p> <pre><code>#include "RollDice.h" #include "./IPlugins.cpp" #include "./IPluginFunctions.cpp" #include &lt;iostream&gt; RollDice::RollDice(IPluginFunctions &amp;iPluginFunctions) : IPlugins(iPluginFunctions) { //srand(time(NULL)); } RollDice::~RollDice() { } void RollDice::callPlugin(std::string paramsText, std::string dataText) { std::cout &lt;&lt; "RollDice ;)\n"; } </code></pre> <p>RollDice.h:</p> <pre><code>#ifndef ROLLDICE_H_ #define ROLLDICE_H_ #include "./IPlugins.h" #include "./IPluginFunctions.h" class RollDice: public IPlugins { public: RollDice(IPluginFunctions &amp;iPluginFunctions); virtual ~RollDice(); virtual void callPlugin(std::string paramsText, std::string dataText); }; extern "C" RollDice* create(IPluginFunctions &amp;iPluginFunctions) { return new RollDice(iPluginFunctions); } extern "C" void destroy(RollDice *rollDice) { delete rollDice; } #endif /* ROLLDICE_H_ */ </code></pre> <p>I create .so file with: g++ -shared -o RollDice.so RollDice.cpp</p> <p>And now in my application I want to open this plugin:</p> <pre><code>this-&gt;plugin = dlopen(directory.c_str(), RTLD_LAZY); if (!(this-&gt;plugin)) { std::cerr &lt;&lt; "Cannot load library: " &lt;&lt; dlerror() &lt;&lt; '\n'; return; } dlerror(); this-&gt;createPlugin = (create_p*) dlsym(plugin, "create"); const char* dlsymError = dlerror(); if (dlsymError) { std::cerr &lt;&lt; "Cannot load symbol create: " &lt;&lt; dlsymError &lt;&lt; '\n'; return; } this-&gt;destroyPlugin = (destroy_p*) dlsym(plugin, "destroy"); dlsymError = dlerror(); if (dlsymError) { std::cerr &lt;&lt; "Cannot load symbol destroy: " &lt;&lt; dlsymError &lt;&lt; '\n'; return; } </code></pre> <p>But I get message: Cannot load library: ./RollDice.so: invalid ELF header</p> <p>Can you help me solving this?</p> <p><code>-fPIC</code> </p> <p>doesn't help</p> <h1>Edit:</h1> <p>Now I'm bulding plugin with:</p> <pre><code>g++ -shared -fPIC -o RollDice.so RollDice.h IPlugins.cpp IPluginFunctions.cpp </code></pre> <p>and I have new problem: Cannot load symbol create: ./RollDice.so: undefined symbol: create</p> <p>When I use <code>nm</code> to see what symbols are in RollDice.so I don't see "create"</p>
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    1. COShot in the dark: I think you need `-fPIC` when compiling code for .sos. But I expect there's more to this than that.
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    2. COI tried it, but it didn't help.
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