- 不能夠自動初始化
- 不能夠接受TAB鍵
- 不能夠通過屬性設(shè)置自動換行
- 不能顯示圖片等其他OLE對象
- 不能夠使用Ctrl+C來實現(xiàn)拷貝
不能夠自動初始化
當(dāng)我第一次將Rich Edit控件放在資源窗體上的時候，發(fā)現(xiàn)程序根本就不能運行。后來才找到原因，原來Rich Edit 控件是Ole類型的控件。在加載Rich Edit 控件的時候，必須進行初始化。代碼如下：
BOOLCTestApp::InitInstance(){
.....
AfxInitRichEdit();
}
不能夠接受TAB鍵
將 RichEdit控件放到資源窗體上的時候，發(fā)現(xiàn)它的屬性頁中并沒有設(shè)置接受TAB鍵的設(shè)置，導(dǎo)致當(dāng)把焦點放到Rich Edit 控件上的時候，一按tab鍵，焦點就移動到下一個控件上面去了。
具體解決方法就是重載Rich Edit控件的OnGetDlgCode：
例子代碼：
.h文件：
class CMyRichEdit : public CRichEditCtrl{
........
afx_msg UINT OnGetDlgCode( );
........
}
.cpp文件：
BEGIN_MESSAGE_MAP(CMyRichEdit, CRichEditCtrl)
ON_WM_GETDLGCODE( )
END_MESSAGE_MAP()
UINT COleRichEditCtrl::OnGetDlgCode( ){
return DLGC_WANTTAB;
}
不能夠通過屬性設(shè)置自動換行
當(dāng)把Rich Edit控件放到資源窗體上的時候，發(fā)現(xiàn)在它的屬性窗體中并沒有設(shè)置Rich Edit控件自動換行的屬性設(shè)置。要達到這一目的，例子代碼如下：
BOOL CTestDlg::InitDialog(){
.............
//m_RichEdit為窗體類的成員變量
this->m_RichEdit.SetTargetDevice(NULL,0);
............
}
不能顯示圖片等其他OLE對象
MFC提供的CRichEditCtrl沒有提供直接顯示圖片等OLE對象的屬性或方法設(shè)置，但是提供了一個接口SetOLECallback( IRichEditOleCallback* pCallback );
要讓CRichEditCtrl顯示圖片，就得在IRichEditOleCallback上下功夫。
IRichEditOleCallback是windows中的接口，它的定義如下：
ContextSensitiveHelp:
通過該方法通知應(yīng)用程序它將以上下文關(guān)聯(lián)方式調(diào)度幫助。
DeleteObject:
通過該方法發(fā)出通知：一個對象即將從RichEdit控件中刪除
GetClipboardData:
通過該方法允許RichEdit的客戶端（調(diào)用程序）提供自己的粘貼對象
GetContextMenu:
通過該方法向應(yīng)用程序提出通過鼠標(biāo)右鍵事件來獲取上下文菜單的請求
GetDragDropEffect:
通過該方法允許RichEdit的客戶端（調(diào)用程序）設(shè)置拖動操作的效果
GetInPlaceContext:
通過該方法提供了應(yīng)用程序級和文檔級接口，以及必要的支持In-place激活的信息
GetNewStrorage:
通過該方法存儲從粘貼板或超文本流(RTF)中讀取的新對象
QueryAcceptData:
通過該方法決定在粘貼操作或拖放操作中引入的數(shù)據(jù)是否可以被接受。
QueryInsertObject:
通過該方法向應(yīng)用程序詢問某個對象是否可以被插入
ShowContainerUI:
通過該方法告知應(yīng)用程序是否顯示自己的操作界面
大致了解了IRichEditOleCallback接口后，就應(yīng)該清楚，要顯示圖片等ole對象，至少應(yīng)該實現(xiàn)GetNewStorage方法，因為該方法是存儲ole對象的接口方法。
以下是接口聲明的代碼：
interface IExRichEditOleCallback : IRichEditOleCallback
{
public:
IExRichEditOleCallback();
virtual ~IExRichEditOleCallback();
int m_iNumStorages;
IStorage* pStorage;
DWORD m_dwRef;
virtual HRESULT STDMETHODCALLTYPE GetNewStorage(LPSTORAGE* lplpstg);
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void ** ppvObject);
virtual ULONG STDMETHODCALLTYPE AddRef();
virtual ULONG STDMETHODCALLTYPE Release();
virtual HRESULT STDMETHODCALLTYPE GetInPlaceContext(LPOLEINPLACEFRAME FAR *lplpFrame,
LPOLEINPLACEUIWINDOW FAR *lplpDoc, LPOLEINPLACEFRAMEINFO lpFrameInfo);
virtual HRESULT STDMETHODCALLTYPE ShowContainerUI(BOOL fShow);
virtual HRESULT STDMETHODCALLTYPE QueryInsertObject(LPCLSID lpclsid, LPSTORAGE lpstg, LONG cp);
virtual HRESULT STDMETHODCALLTYPE DeleteObject(LPOLEOBJECT lpoleobj);
virtual HRESULT STDMETHODCALLTYPE QueryAcceptData(LPDATAOBJECT lpdataobj, CLIPFORMAT FAR *lpcfFormat, DWORD reco, BOOL fReally, HGLOBAL hMetaPict);
virtual HRESULT STDMETHODCALLTYPE ContextSensitiveHelp(BOOL fEnterMode);
virtual HRESULT STDMETHODCALLTYPE GetClipboardData(CHARRANGE FAR *lpchrg, DWORD reco, LPDATAOBJECT FAR *lplpdataobj);
virtual HRESULT STDMETHODCALLTYPE GetDragDropEffect(BOOL fDrag, DWORD grfKeyState, LPDWORD pdwEffect);
virtual HRESULT STDMETHODCALLTYPE GetContextMenu(WORD seltyp, LPOLEOBJECT lpoleobj, CHARRANGE FAR *lpchrg, HMENU FAR *lphmenu);
}
關(guān)于接口的實現(xiàn)，將被附在最后的附錄中。
不能夠使用Ctrl+C來實現(xiàn)拷貝
實際上，CRichEditCtrl本身是支持Ctrl+C實現(xiàn)拷貝功能的，但是當(dāng)我在CRichiEditCtrl的繼承類中使用了IRichiEditCallback接口后，它就不在支持Ctrl+C實現(xiàn)拷貝功能了。我想問題就出在IRichEditCallback接口上。
仔細看了一遍它的幫助文檔，我發(fā)現(xiàn)問題就出在GetClipboardData上，我沒有在它的實現(xiàn)方法中寫代碼，只是返回了S_OK，如果要處理Ctrl+C，就必須返回E_NOTIMPL。
以上是我近幾天的開發(fā)經(jīng)歷，與大家分享，還希望路過的高手多多指教。
在以下關(guān)于RichEdit的代碼例子中，我參考了Mike O'Neill 的代碼，再次謝謝他的貢獻。
附錄
.h文件
#if !defined(AFX_OLERICHEDITCTRL_H__3DFF15EE_7336_4297_9620_7F00B611DAA1__INCLUDED_)
#define AFX_OLERICHEDITCTRL_H__3DFF15EE_7336_4297_9620_7F00B611DAA1__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// OleRichEditCtrl.h : header file
//
＃i nclude < richole.h >
/////////////////////////////////////////////////////////////////////////// //
// COleRichEditCtrl window
class COleRichEditCtrl : public CRichEditCtrl
{
// Construction
public :
COleRichEditCtrl();
virtual ~ COleRichEditCtrl();
long StreamInFromResource( int iRes, LPCTSTR sType);
protected :
static DWORD CALLBACK readFunction(DWORD dwCookie,
LPBYTE lpBuf, // the buffer to fill
LONG nCount, // number of bytes to read
LONG * nRead); // number of bytes actually read
interface IExRichEditOleCallback; // forward declaration (see below in this header file)
IExRichEditOleCallback * m_pIRichEditOleCallback;
BOOL m_bCallbackSet;
interface IExRichEditOleCallback : public IRichEditOleCallback
{
public :
IExRichEditOleCallback();
virtual ~ IExRichEditOleCallback();
int m_iNumStorages;
IStorage * pStorage;
DWORD m_dwRef;
virtual HRESULT STDMETHODCALLTYPE GetNewStorage(LPSTORAGE * lplpstg);
virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void ** ppvObject);
virtual ULONG STDMETHODCALLTYPE AddRef();
virtual ULONG STDMETHODCALLTYPE Release();
virtual HRESULT STDMETHODCALLTYPE GetInPlaceContext(LPOLEINPLACEFRAME FAR * lplpFrame,
LPOLEINPLACEUIWINDOW FAR * lplpDoc, LPOLEINPLACEFRAMEINFO lpFrameInfo);
virtual HRESULT STDMETHODCALLTYPE ShowContainerUI(BOOL fShow);
virtual HRESULT STDMETHODCALLTYPE QueryInsertObject(LPCLSID lpclsid, LPSTORAGE lpstg, LONG cp);
virtual HRESULT STDMETHODCALLTYPE DeleteObject(LPOLEOBJECT lpoleobj);
virtual HRESULT STDMETHODCALLTYPE QueryAcceptData(LPDATAOBJECT lpdataobj, CLIPFORMAT FAR * lpcfFormat,
DWORD reco, BOOL fReally, HGLOBAL hMetaPict);
virtual HRESULT STDMETHODCALLTYPE ContextSensitiveHelp(BOOL fEnterMode);
virtual HRESULT STDMETHODCALLTYPE GetClipboardData(CHARRANGE FAR * lpchrg, DWORD reco, LPDATAOBJECT FAR * lplpdataobj);
virtual HRESULT STDMETHODCALLTYPE GetDragDropEffect(BOOL fDrag, DWORD grfKeyState, LPDWORD pdwEffect);
virtual HRESULT STDMETHODCALLTYPE GetContextMenu(WORD seltyp, LPOLEOBJECT lpoleobj, CHARRANGE FAR * lpchrg,
HMENU FAR * lphmenu);
};
public :
// Overrides
// ClassWizard generated virtual function overrides
// {{AFX_VIRTUAL(COleRichEditCtrl)
protected :
virtual void PreSubclassWindow();
// }}AFX_VIRTUAL
// Implementation
public :
// Generated message map functions
protected :
// {{AFX_MSG(COleRichEditCtrl)
afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
// }}AFX_MSG
afx_msg UINT OnGetDlgCode( );
DECLARE_MESSAGE_MAP()
};
/////////////////////////////////////////////////////////////////////////// //
// {{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_OLERICHEDITCTRL_H__3DFF15EE_7336_4297_9620_7F00B611DAA1__INCLUDED_)
.cpp文件
// OleRichEditCtrl.cpp : implementation file
//
＃i nclude " stdafx.h "
＃i nclude " OleRichEditCtrl.h "
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////// //
// COleRichEditCtrl
COleRichEditCtrl::COleRichEditCtrl()
{
m_bCallbackSet = FALSE;
}
COleRichEditCtrl:: ~ COleRichEditCtrl()
{
// IExRichEditOleCallback class is a reference-counted class
// which deletes itself and for which delete should not be called
// delete m_pIRichEditOleCallback;
}
BEGIN_MESSAGE_MAP(COleRichEditCtrl, CRichEditCtrl)
// {{AFX_MSG_MAP(COleRichEditCtrl)
ON_WM_CREATE()
// }}AFX_MSG_MAP
ON_WM_GETDLGCODE( )
END_MESSAGE_MAP()
//
int COleRichEditCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CRichEditCtrl::OnCreate(lpCreateStruct) == - 1 )
return - 1 ;
// m_pIRichEditOleCallback should have been created in PreSubclassWindow
ASSERT( m_pIRichEditOleCallback != NULL );
// set the IExRichEditOleCallback pointer if it wasn't set
// successfully in PreSubclassWindow
if ( ! m_bCallbackSet )
{
SetOLECallback( m_pIRichEditOleCallback );
}
return 0 ;
}
void COleRichEditCtrl::PreSubclassWindow()
{
// base class first
CRichEditCtrl::PreSubclassWindow();
m_pIRichEditOleCallback = NULL;
m_pIRichEditOleCallback = new IExRichEditOleCallback;
ASSERT( m_pIRichEditOleCallback != NULL );
m_bCallbackSet = SetOLECallback( m_pIRichEditOleCallback );
}
long COleRichEditCtrl::StreamInFromResource( int iRes, LPCTSTR sType)
{
HINSTANCE hInst = AfxGetInstanceHandle();
HRSRC hRsrc = ::FindResource(hInst,
MAKEINTRESOURCE(iRes), sType);
DWORD len = SizeofResource(hInst, hRsrc);
BYTE * lpRsrc = (BYTE * )LoadResource(hInst, hRsrc);
ASSERT(lpRsrc);
CMemFile mfile;
mfile.Attach(lpRsrc, len);
EDITSTREAM es;
es.pfnCallback = readFunction;
es.dwError = 0 ;
es.dwCookie = (DWORD) & mfile;
return StreamIn( SF_RTF, es );
}
/* static */
DWORD CALLBACK COleRichEditCtrl::readFunction(DWORD dwCookie,
LPBYTE lpBuf, // the buffer to fill
LONG nCount, // number of bytes to read
LONG * nRead) // number of bytes actually read
{
CFile * fp = (CFile * )dwCookie;
* nRead = fp -> Read(lpBuf,nCount);
return 0 ;
}
/////////////////////////////////////////////////////////////////////////// //
COleRichEditCtrl::IExRichEditOleCallback::IExRichEditOleCallback()
{
pStorage = NULL;
m_iNumStorages = 0 ;
m_dwRef = 0 ;
// set up OLE storage
HRESULT hResult = ::StgCreateDocfile(NULL,
STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE /* | STGM_DELETEONRELEASE */ | STGM_CREATE ,
0 , & pStorage );
if ( pStorage == NULL ||
hResult != S_OK )
{
AfxThrowOleException( hResult );
}
}
COleRichEditCtrl::IExRichEditOleCallback:: ~ IExRichEditOleCallback()
{
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::GetNewStorage(LPSTORAGE * lplpstg)
{
m_iNumStorages ++ ;
WCHAR tName[ 50 ];
swprintf(tName, L " REOLEStorage%d " , m_iNumStorages);
HRESULT hResult = pStorage -> CreateStorage(tName,
STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE | STGM_CREATE ,
0 , 0 , lplpstg );
if (hResult != S_OK )
{
::AfxThrowOleException( hResult );
}
return hResult;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::QueryInterface(REFIID iid, void ** ppvObject)
{
HRESULT hr = S_OK;
* ppvObject = NULL;
if ( iid == IID_IUnknown ||
iid == IID_IRichEditOleCallback )
{
* ppvObject = this ;
AddRef();
hr = NOERROR;
}
else
{
hr = E_NOINTERFACE;
}
return hr;
}
ULONG STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::AddRef()
{
return ++ m_dwRef;
}
ULONG STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::Release()
{
if ( -- m_dwRef == 0 )
{
delete this ;
return 0 ;
}
return m_dwRef;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::GetInPlaceContext(LPOLEINPLACEFRAME FAR * lplpFrame,
LPOLEINPLACEUIWINDOW FAR * lplpDoc, LPOLEINPLACEFRAMEINFO lpFrameInfo)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::ShowContainerUI(BOOL fShow)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::QueryInsertObject(LPCLSID lpclsid, LPSTORAGE lpstg, LONG cp)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::DeleteObject(LPOLEOBJECT lpoleobj)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::QueryAcceptData(LPDATAOBJECT lpdataobj, CLIPFORMAT FAR * lpcfFormat,
DWORD reco, BOOL fReally, HGLOBAL hMetaPict)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::ContextSensitiveHelp(BOOL fEnterMode)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::GetClipboardData(CHARRANGE FAR * lpchrg, DWORD reco, LPDATAOBJECT FAR * lplpdataobj)
{
return E_NOTIMPL;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::GetDragDropEffect(BOOL fDrag, DWORD grfKeyState, LPDWORD pdwEffect)
{
return S_OK;
}
HRESULT STDMETHODCALLTYPE
COleRichEditCtrl::IExRichEditOleCallback::GetContextMenu(WORD seltyp, LPOLEOBJECT lpoleobj, CHARRANGE FAR * lpchrg,
HMENU FAR * lphmenu)
{
return S_OK;
}
// TabRichEditCtrl 消息處理程序
UINT COleRichEditCtrl::OnGetDlgCode( ){
return DLGC_WANTTAB;
}