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Q_decl_export must be added to the declarations of symbols used when compiling a shared library 一个 共享库导出给用户使用的类、符号、函数等都需要用宏Q_DECL_EXPORT来定义导出，一个 使用共享库的应用程序需要通过Q_DECL_IMPORT导入共享库里的可用对象。 Q_decl_import must be added to the declarations of symbols used when compiling a client that uses the shared library.
See also q_decl_export and creating shared libraries If we don’t want things to be visible for the outside world (on windows), we simply don’t use export_api. It is usually used with libraries to define those functions which need to be exported from the library, in order to be imported (used) by other libraries or by executables.
本文介绍Qt中的动态链接库编程技巧，重点讲解跨平台共享库的实现方法，并通过实例演示了如何创建和使用插件。 使用C++面向对象的类编写DLL是要注意很多细节的，主要是二进制（ABI）兼容问题。 COM是一个很成功的例子，只要符合COM的规范，我们就能编写出很好的DLL来，然而COM是微软私生的，要想跨平台，我们还得另找它路。 Qt 的跨平台特性同样令人兽血沸腾。 如果你认为 QT 仅 仅是一个跨平台界面库，那就小看它了。 我要说的是，它不但是一个通用的跨平台的面向对象的应用程序接口库（包括GUI、数据库、网络、多线程、XML、数 据容器和算法等，常用的编辑资源都有封装，就是说，这些都可以跨平台，而不仅仅是界面），更是一种C++语言的扩展，一种编程平台和应用程序框架。
为了在客户端使用共享库，一些平台可能需要一个特殊的导入声明。 为此，Qt 提供了两个特殊的宏： Q_DECL_EXPORT：当编译共享库时，必须将其添加到使用的符号声明。 Q_DECL_IMPORT：当编译一个（使用了该共享库）客户端时，必须将其添加到使用的符号声明。 Q_decl_export is a macro that expands to either the msvc or mingw specific attribute to let you write portable code, so you should use it Similarly, if you're using qmake, you can add config += hide_symbols in your pro file to add the toolchain specific linker flags to hide symbols by default. 文章讲述了Qt框架中的Q_DECL_IMPORT和Q_DECL_EXPORT宏在处理动态链接库中的符号导入和导出，如何根据不同构建方式正确管理类和函数的可见性及链接问题。
When you write dlls, you have to explicitly mark objects (functions, classes or variables) that should be visible from the outside and you do this with __declspec (dllexport) tag All other objects won't be accessible from the outside and only dll code will be able to use them. Now i've been wondering, as normally the q_decl_export macro has to be put in front of every class/function that should be exported from the shared library, what about inline functions fully defined in a public header file, to be used by the user, like q_declare_operators_for_flags does? With this solution we can now export freely everything we want to from liba and link from liba’s dll
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