使用IDispEventSimpleImpl

在使用 IDispEventSimpleImpl 处理事件时，您需要:

• 从 IDispEventSimpleImpl派生您的选件类。

• 添加 事件接收器映射 到您的选件类。

• 定义描述操作的 _ATL_FUNC_INFO 结构。

• 使用 SINK_ENTRY_INFO 宏，将项添加到事件接收器映射。

• 执行方法您对处理感兴趣。

• 建议和unadvise事件源。

示例

在下面的示例显示了您处理 DocumentChange 事件如何通过运行的 Application 对象激发的。此事件定义为 ApplicationEvents 调度接口的方法。

此示例是从 ATLEventHandling示例。

[

uuid(000209F7-0000-0000-C000-000000000046),

hidden

]

dispinterface ApplicationEvents {

properties:

methods:

[id(0x00000001), restricted, hidden]

void Startup();

[id(0x00000002)]

void Quit();

[id(0x00000003)]

void DocumentChange();

};

该示例使用 #import 从生成的类型库所需的标头文件。如果要使用Word的其他版本的此示例，必须指定正确的mso dll文件。例如，Office 2000提供mso9.dll，而Office XP提供mso.dll。此代码从stdafx.h简化:

#pragma warning (disable : 4146)

// Paths to required MS OFFICE files (replace "MSO.DLL" and "MSWORD.OLB" with the actual paths to those files...)
#define _MSDLL_PATH "MSO.DLL"
// Delete the *.tlh files when changing import qualifiers
#import _MSDLL_PATH rename("RGB", "MSRGB") rename("DocumentProperties", "WordDocumentProperties") raw_interfaces_only

#import "C:\Program Files\Common Files\Microsoft Shared\VBA\VBA6\VBE6EXT.OLB" raw_interfaces_only

#define _MSWORDOLB_PATH "MSWORD.OLB"
#import _MSWORDOLB_PATH rename("ExitWindows", "WordExitWindows") rename("FindText", "WordFindText") raw_interfaces_only

#pragma warning (default : 4146)

从类型用于此示例实际的库的所有信息是Word Application 对象和 ApplicationEvents 接口的IID的CLSID。此信息只使用在编译时。

下面的代码显示Simple.h。相关代码按注释说明:

// Note declaration of structure for type information
extern _ATL_FUNC_INFO OnDocChangeInfo;
extern _ATL_FUNC_INFO OnQuitInfo;

class ATL_NO_VTABLE CSimple : 
   public CComObjectRootEx<CComSingleThreadModel>,
   public CComCoClass<CSimple, &CLSID_Simple>,
   public IDispatchImpl<ISwitch, &IID_ISwitch, &LIBID_ATLEVENTHANDLINGLib>,
   // Note inheritance from IDispEventSimpleImpl
   public IDispEventSimpleImpl</*nID =*/ 1, CSimple, &__uuidof(Word::ApplicationEvents)>
{
public:
   CSimple()
   {
   }

DECLARE_REGISTRY_RESOURCEID(IDR_SIMPLE)

DECLARE_PROTECT_FINAL_CONSTRUCT()

BEGIN_COM_MAP(CSimple)
   COM_INTERFACE_ENTRY(ISwitch)
   COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()

   CComPtr<Word::_Application> m_pApp;

   // Event handlers
   // Note the __stdcall calling convention and 
   // dispinterface-style signature
   void __stdcall OnQuit()
   {
      Stop();
   }

   void __stdcall OnDocChange()
   {
     ATLASSERT(m_pApp != NULL);

      // Get a pointer to the _Document interface on the active document
      CComPtr<Word::_Document> pDoc;
      m_pApp->get_ActiveDocument(&pDoc);

      // Get the name from the active document
      CComBSTR bstrName;
     if (pDoc)
      pDoc->get_Name(&bstrName);

      // Create a display string
      CComBSTR bstrDisplay(_T("New document title:\n"));
      bstrDisplay += bstrName;

      // Display the name to the user
      USES_CONVERSION;
      MessageBox(NULL, W2CT(bstrDisplay), _T("IDispEventSimpleImpl : Active Document Changed"), MB_OK);
   }

// Note the mapping from Word events to our event handler functions.
BEGIN_SINK_MAP(CSimple)
   SINK_ENTRY_INFO(/*nID =*/ 1, __uuidof(Word::ApplicationEvents), /*dispid =*/ 3, OnDocChange, &OnDocChangeInfo)
   SINK_ENTRY_INFO(/*nID =*/ 1, __uuidof(Word::ApplicationEvents), /*dispid =*/ 2, OnQuit, &OnQuitInfo)
END_SINK_MAP()

// ISwitch
public:
   STDMETHOD(Start)()
   {
      // If we already have an object, just return
      if (m_pApp)
         return S_OK;

      // Create an instance of Word's Application object
      HRESULT hr = m_pApp.CoCreateInstance(__uuidof(Word::Application), NULL, CLSCTX_SERVER);
     if (FAILED(hr))
        return hr;

     ATLASSERT(m_pApp != NULL);

      // Make the Word user interface visible
      m_pApp->put_Visible(true);

      // Note call to advise
      // Forge a connection to enable us to receive events
      DispEventAdvise(m_pApp);

      return S_OK;
   }

   STDMETHOD(Stop)()
   {
      // Check we have an object to unadvise on
      if (!m_pApp)
         return S_OK;

      // Note call to unadvise
      // Break the connection with the event source
      DispEventUnadvise(m_pApp);

      // Release the Word application
      m_pApp.Release();

      return S_OK;
   }
};

下面的代码是从Simple.cpp:

// Define type info structure
_ATL_FUNC_INFO OnDocChangeInfo = {CC_STDCALL, VT_EMPTY, 0};
_ATL_FUNC_INFO OnQuitInfo = {CC_STDCALL, VT_EMPTY, 0};
// (don't actually need two structure since they're the same)

请参见

概念

事件处理和ATL

ATLEventHandling示例