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    <p>Create a DLL project and specify the preprocessor directive e.g. /DIFLOOR_EXPORTS_COMMONPLUGINBASE (this preprocessor variable only in DLL project)</p> <p>Then create a header which specifies whether your classes are imported or exported:</p> <p><strong>CommonPluing.h</strong></p> <pre><code>#ifndef _COMMONPLUGIN_H #define _COMMONPLUGIN_H #if defined(__WXMSW__) #ifdef IFLOOR_EXPORTS_COMMONPLUGINBASE #define IFLOOR_API_COMMONPLUGINBASE __declspec(dllexport) #else #define IFLOOR_API_COMMONPLUGINBASE __declspec(dllimport) #endif #else #define IFLOOR_API_COMMONPLUGINBASE #endif #endif // _COMMONPLUGIN_H </code></pre> <p>Then create your exported class and add the specifier from first header:</p> <p><strong>CommonConfigWindowBase.h</strong></p> <pre><code>class IFLOOR_API_COMMONPLUGINBASE CommonConfigWindowBase : public wxPanel { DECLARE_DYNAMIC_CLASS(CommonConfigWindowBase) public: /// Constructors CommonConfigWindowBase(); CommonConfigWindowBase(wxWindow *parent, wxWindowID winid = wxID_ANY, const wxPoint&amp; pos = wxDefaultPosition, const wxSize&amp; size = wxDefaultSize, long style = wxTAB_TRAVERSAL | wxNO_BORDER, const wxString&amp; name = wxPanelNameStr); /// Pseudo ctor bool Create(wxWindow *parent, wxWindowID winid = wxID_ANY, const wxPoint&amp; pos = wxDefaultPosition, const wxSize&amp; size = wxDefaultSize, long style = wxTAB_TRAVERSAL | wxNO_BORDER, const wxString&amp; name = wxPanelNameStr); virtual ~CommonConfigWindowBase(); /// Reads config from the effect virtual bool ReadConfig(){return true;} /// Saves config to the effect virtual bool SaveConfig(){return true;} }; </code></pre> <p>Create the exported function callable from main executable (you may want to create a wrapper class and call methods which return wxWindow *). You need an exported method for creating the plugin object and for deleting it. Also you need a !!! virtual destructors !!! for exported object and for your windows. so assuming that SportEffectPlugin contains a wxWindow * CreateConfigWindow(wxWindow * parent) method:</p> <p><strong>Exports.cpp</strong></p> <pre><code>#include "stdwx.h" #include "CommonConfigWindowBase.h" IFLOOR_API_COMMONPLUGINBASE IFloorEffectPluginBase * CreatePlugin(const wxString&amp; sBasePath, iFloorBlobVector * blobs) { return new SportEffectPlugin(sBasePath, blobs); } IFLOOR_API_COMMONPLUGINBASE void DeletePlugin(IFloorEffectPluginBase * plugin) { wxDELETE(plugin); } </code></pre> <p>Then in main app load the DLL (you will need to adopt the following code for your needs):</p> <p><strong>Loader.cpp</strong></p> <pre><code>bool IFloorSystem::LoadPlugins(bool forceProgramPath) { if (!m_DefaultPlugin) { m_DefaultPlugin = new DefaultEffectPlugin(GetDefaultGraphicsPath()); RegisterEffectPlugin(m_DefaultPlugin); } wxFileName fn; fn.AssignDir(GetPluginsPath(forceProgramPath)); wxLogDebug(wxT("%s"), fn.GetFullPath().data()); fn.AppendDir(wxT("effects")); wxLogDebug(wxT("%s"), fn.GetFullPath().data()); if (!fn.DirExists()) return false; wxDir dir(fn.GetFullPath()); if (!dir.IsOpened()) return false; // scan for plugins wxString filename; wxString ext = wxT("*.dll"); // TODO: change ext for different platforms bool bFound = dir.GetFirst(&amp;filename, ext, wxDIR_FILES); while (bFound) { fn.SetFullName(filename); wxDynamicLibrary * dll = new wxDynamicLibrary(fn.GetFullPath()); if (dll-&gt;IsLoaded()) { wxDYNLIB_FUNCTION(CreatePlugin_function, CreatePlugin, *dll); if (pfnCreatePlugin) { IFloorEffectPluginBase* plugin = pfnCreatePlugin(GetDefaultGraphicsPath(), &amp;IFloorStorage::Instance().GetBlobs()); RegisterEffectPlugin(plugin); m_DllList.Append(dll); m_MapPluginsDll[plugin] = dll; } else wxDELETE(dll); } bFound = dir.GetNext(&amp;filename); } return true; } </code></pre> <p>Then in the end you will need to unload plugins and delete all loaded objects by calling the function from DLL:</p> <pre><code>bool IFloorSystem::UnRegisterEffectPlugin(IFloorEffectPluginBase * plugin) { IFloorEffectPluginBaseList::compatibility_iterator it = m_Plugins.Find(plugin); if (it == NULL) return false; do { wxDynamicLibrary * dll = m_MapPluginsDll[plugin]; if (!dll) // Probably plugin was not loaded from dll break; wxDYNLIB_FUNCTION(DeletePlugin_function, DeletePlugin, *dll); if (pfnDeletePlugin) { pfnDeletePlugin(plugin); m_Plugins.Erase(it); m_MapPluginsDll.erase(plugin); return true; } } while (false); // If plugin is not loaded from DLL wxDELETE(plugin); m_Plugins.Erase(it); return true; } </code></pre>
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    1. POwxWidgets - Add items to sizer via DLL
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    1. COHi, could you please take a look at my original post? I added an update to it. Thank you.
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    2. COHere is what I have in CMake script (preprocessor definitions): set(PREPROCESSOR_DEFINITIONS ${PREPROCESSOR_DEFINITIONS};/D_USRDLL;/DIFLOOR_EXPORTS_COMMONPLUGINBASE;/D__STDC_CONSTANT_MACROS) - you can see that IFLOOR_EXPORTS_COMMONPLUGINBASE is used in CommonPlugin.h for defining IFLOOR_API_COMMONPLUGINBASE macro which holds export specifier for DLL classes. Also don't forget that you need to build wxWidgets as DLL and use runtime libs as Multi-Threaded Debug DLL (for Debug) and Multi-Threaded DLL (for Release) and same options in your DLL and host app.
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    3. COHere is what I have in DLL's pre-processor definitions: WIN32;_WINDOWS;NDEBUG;WXUSINGDLL;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;_UNICODE;__WXDEBUG__=1;_USRDLL;IFLOOR_EXPORTS_COMMONPLUGINBASE;CMAKE_INTDIR="Release";CommonPluginBase_EXPORTS;%(PreprocessorDefinitions)
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