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POC++ Dynamic Shared Library on Linux
 

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    <p>This is a follow-up to <a href="https://stackoverflow.com/q/483797/1288">Dynamic Shared Library compilation with g++</a>.</p> <p>I'm trying to create a shared class library in C++ on Linux. I'm able to get the library to compile, and I can call some of the (non-class) functions using the tutorials that I found <a href="https://stackoverflow.com/questions/496664/c-dynamic-shared-library-on-linux/497067#497067">here</a> and <a href="http://rads.stackoverflow.com/amzn/click/0470147628" rel="noreferrer">here</a>. My problems start when I try to use the classes that are defined in the library. The second tutorial that I linked to shows how to load the symbols for creating objects of the classes defined in the library, but stops short of <em>using</em> those objects to get any work done.</p> <p>Does anyone know of a more complete tutorial for creating shared C++ class libraries that also shows how to <em>use</em> those classes in a separate executable? A very simple tutorial that shows object creation, use (simple getters and setters would be fine), and deletion would be fantastic. A link or a reference to some open source code that illustrates the use of a shared class library would be equally good.</p> <hr> <p>Although the answers from <a href="https://stackoverflow.com/q/483797/1288">codelogic</a> and <a href="https://stackoverflow.com/questions/496664/c-dynamic-shared-library-on-linux/497067#497067">nimrodm</a> do work, I just wanted to add that I picked up a copy of <a href="http://rads.stackoverflow.com/amzn/click/0470147628" rel="noreferrer">Beginning Linux Programming</a> since asking this question, and its first chapter has example C code and good explanations for creating and using both static and shared libraries. These examples are available through Google Book Search in <a href="http://books.google.com/books?hl=en&amp;id=7q0TFMi7FIkC&amp;dq=beginning+linux+programming&amp;printsec=frontcover&amp;source=web&amp;ots=ko8ox73Gd6&amp;sig=Fbp6iqNbeRaADHOUB0Px-99uaY8&amp;sa=X&amp;oi=book_result&amp;resnum=3&amp;ct=result#PPA10,M1" rel="noreferrer">an older edition of that book</a>.</p>
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    1. COI'm not sure I understand what you mean by "using" it, once a pointer to the object is returned, you could use it like you use any other pointer to an object.
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    2. COThe article I linked to shows how to create a function pointer to an object factory function using dlsym. It doesn't show the syntax for creating and using objects from the library.
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    3. COYou will need the header file describing the class. Why do you think you have to use "dlsym" instead of just letting the OS find and link the library at load time? Let me know if you need a simple example.
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