C++ 编写 CorelDRAW CPG 插件例子（2）—ClearFill

这是另一个例子；

贴上主要代码：

 #include "stdafx.h"
 #include <tchar.h>

 #import "libid:95E23C91-BC5A-49F3-8CD1-1FC515597048" version("d.0") \
       rename("GetCommandLine", "VGGetCommandLine") \
       rename("CopyFile", "VGCore") \
       rename("FindWindow", "VGFindWindow")

 #ifdef _MANAGED
 #pragma managed(push, off)
 #endif

 BOOL APIENTRY DllMain( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved )
 {
   switch (fdwReason)
   {
     case DLL_PROCESS_ATTACH:
     case DLL_THREAD_ATTACH:
     case DLL_THREAD_DETACH:
     case DLL_PROCESS_DETACH:
       break;
   }
   return TRUE;
 }

 #ifdef _MANAGED
 #pragma managed(pop)
 #endif

 class CVGAppPlugin : public VGCore::IVGAppPlugin
 {
 private:
   VGCore::IVGApplication *m_pApp;
   ULONG m_ulRefCount;
   long m_lCookie;
   bool m_bEnabled;

   bool CheckSelection();
   void OnClearFill();

 public:
   CVGAppPlugin();

 // IUnknown
 public:
   STDMETHOD(QueryInterface)(REFIID riid, void **ppvObject);
   STDMETHOD_(ULONG, AddRef)(void) { return ++m_ulRefCount; }
   STDMETHOD_(ULONG, Release)(void)
   {
     ULONG ulCount = --m_ulRefCount;
     if(ulCount == )
     {
       delete this;
     }
     return ulCount;
   }

 // IDispatch
 public:
   STDMETHOD(GetTypeInfoCount)(UINT *pctinfo) { return E_NOTIMPL; }
   STDMETHOD(GetTypeInfo)(UINT iTInfo, LCID lcid, ITypeInfo **ppTInfo) { return E_NOTIMPL; }
   STDMETHOD(GetIDsOfNames)(REFIID riid, LPOLESTR *rgszNames, UINT cNames, LCID lcid, DISPID *rgDispId) { return E_NOTIMPL; }
   STDMETHOD(Invoke)(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr);

 // IVGAppPlugin
 public:
   STDMETHOD(raw_OnLoad)(VGCore::IVGApplication *Application);
   STDMETHOD(raw_StartSession)();
   STDMETHOD(raw_StopSession)();
   STDMETHOD(raw_OnUnload)();
 };

 bool CVGAppPlugin::CheckSelection()
 {
   bool bRet = false;
   if(m_pApp->Documents->Count > )
   {
     bRet = (m_pApp->ActiveSelection->Shapes->Count > );
   }
   return bRet;
 }

 void CVGAppPlugin::OnClearFill()
 {
   if(CheckSelection())
   {
     m_pApp->ActiveSelection->Fill->ApplyNoFill();
   }
 }

 CVGAppPlugin::CVGAppPlugin() :
   m_pApp(NULL),
   m_lCookie(),
   m_ulRefCount(),
   m_bEnabled(false)
 {
 }

 STDMETHODIMP CVGAppPlugin::QueryInterface(REFIID riid, void **ppvObject)
 {
   HRESULT hr = S_OK;
   m_ulRefCount++;
   if(riid == IID_IUnknown)
   {
     *ppvObject = (IUnknown *)this;
   }
   else if(riid == IID_IDispatch)
   {
     *ppvObject = (IDispatch *)this;
   }
   else if(riid == __uuidof(VGCore::IVGAppPlugin))
   {
     *ppvObject = (VGCore::IVGAppPlugin *)this;
   }
   else
   {
     m_ulRefCount--;
     hr = E_NOINTERFACE;
   }
   return hr;
 }

 STDMETHODIMP CVGAppPlugin::Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
 {
   switch(dispIdMember)
   {
     case 0x0011: //DISPID_APP_SELCHANGE
       m_bEnabled = CheckSelection();
       break;

     case 0x0014: // DISPID_APP_ONPLUGINCMD
       if(pDispParams != NULL && pDispParams->cArgs == )
       {
         _bstr_t strCmd(pDispParams->rgvarg[].bstrVal);
         if(strCmd == _bstr_t("ClearFill"))
         {
           OnClearFill();
         }
       }
       break;

     case 0x0015: // DISPID_APP_ONPLUGINCMDSTATE
       if(pDispParams != NULL && pDispParams->cArgs == )
       {
         _bstr_t strCmd(pDispParams->rgvarg[].bstrVal);
         if(strCmd == _bstr_t("ClearFill"))
         {
           *pDispParams->rgvarg[].pboolVal = m_bEnabled ? VARIANT_TRUE : VARIANT_FALSE;
         }
       }
       break;
   }
   return S_OK;
 }

 STDMETHODIMP CVGAppPlugin::raw_OnLoad(VGCore::IVGApplication *Application)
 {
   m_pApp = Application;
   if(m_pApp)
   {
     m_pApp->AddRef();
   }
   return S_OK;
 }

 STDMETHODIMP CVGAppPlugin::raw_StartSession()
 {
   try
   {
     m_pApp->AddPluginCommand(_bstr_t("ClearFill"), _bstr_t("Clear Fill"), _bstr_t("Clears fill from selected objects"));
     VGCore::CommandBarControlPtr ctl = m_pApp->CommandBars->Item[_bstr_t("Standard")]->Controls->AddCustomButton(VGCore::cdrCmdCategoryPlugins, _bstr_t("ClearFill"), , VARIANT_TRUE);
     _bstr_t bstrPath(m_pApp->Path + _bstr_t("Plugins\\ClearFill.bmp"));
     ctl->SetCustomIcon(bstrPath);
     m_lCookie = m_pApp->AdviseEvents(this);
   }
   catch(_com_error &e)
   {
     MessageBox(NULL, e.Description(), _T("Error"), MB_ICONSTOP);
   }
   return S_OK;
 }

 STDMETHODIMP CVGAppPlugin::raw_StopSession()
 {
   try
   {
     m_pApp->UnadviseEvents(m_lCookie);
     m_pApp->RemovePluginCommand(_bstr_t("ClearFill"));
   }
   catch(_com_error &e)
   {
     MessageBox(NULL, e.Description(), _T("Error"), MB_ICONSTOP);
   }
   return S_OK;
 }

 STDMETHODIMP CVGAppPlugin::raw_OnUnload()
 {
   if(m_pApp)
   {
     m_pApp->Release();
     m_pApp = NULL;
   }
   return S_OK;
 }

 extern "C" __declspec(dllexport) DWORD APIENTRY AttachPlugin(VGCore::IVGAppPlugin **ppIPlugin)
 {
   *ppIPlugin = new CVGAppPlugin;
   return 0x100;
 }

下载：

ClearFill_src.zip
ClearFill_cpg.zip