CRichEditCtrl加載 rtf 檔案和字元串的方法

CRichEditCtrl類沒有直接指派 rtf 的方法，需要通過回調函數的方式加載。方法如下（該方法也可用于加載文本格式的檔案或字元串）：

• 函數聲明：

  static DWORD CALLBACK EditStreamCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb);

• 加載檔案的方式

  EDITSTREAM es;

  CFile file(_T("E://a.rtf"), CFile::modeRead);

  es.dwError = 0;

  es.pfnCallback = EditStreamCallback;

  es.dwCookie = (DWORD) &file;

  m_wndRichEdit.StreamIn(SF_RTF, es);

  file.Close();

  DWORD CALLBACK CPrintDlg::EditStreamCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)

  {

  CFile* pFile = (CFile*)dwCookie;

  *pcb = pFile->Read(pbBuff, cb);

  return 0;

  }

• 加載字元串(rtf或純文字)

  1. 通過臨時檔案

     void CPrintDlg::PrintTickets()

     {

     EDITSTREAM es;

     char* pBuffer = NULL;

     long lBufferSize;

     lBufferSize = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, m_sRtf, -1, NULL, 0, NULL, NULL);

     pBuffer = new char[lBufferSize + 1];

     WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, m_sRtf, -1, pBuffer, lBufferSize + 1, NULL, NULL);

     CFile file(_T("E://a.rtf"), CFile::modeCreate | CFile::modeWrite);

     file.Write(pBuffer, lBufferSize);

     file.Close();

     file.Open(_T("E://a.rtf"), CFile::modeRead);

     es.dwError = 0;

     es.pfnCallback = EditStreamCallback;

     es.dwCookie = (DWORD) &file;

     m_wndRichEdit.StreamIn(SF_RTF, es);

     file.Close();

     delete[] pBuffer;

     }

     DWORD CALLBACK CPrintDlg::EditStreamCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)

     {

     CFile* pFile = (CFile*)dwCookie;

     *pcb = pFile->Read(pbBuff, cb);

     return 0;

     }

  2. 直接加載字元串

     void CPrintDlg::PrintTickets()

     {

     EDITSTREAM es;

     char* pBuffer = NULL;

     char* pTmp2;

     char** pTmp;

     long lBufferSize;

     lBufferSize = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, m_sRtf, -1, NULL, 0, NULL, NULL);

     pBuffer = new char[lBufferSize + 1];

     WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, m_sRtf, -1, pBuffer, lBufferSize + 1, NULL, NULL);

     pTmp2 = pBuffer;

     pTmp = &pTmp2;

     es.dwError = 0;

     es.pfnCallback = EditStreamCallback;

     es.dwCookie = (DWORD)pTmp;

     m_wndRichEdit.StreamIn(SF_RTF, es);

     pTmp = NULL;

     delete[] pBuffer;

     }

     DWORD CALLBACK CPrintDlg::EditStreamCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)

     {

     char** pBuffer = (char**)dwCookie;

     long lBufferSize = strlen(*pBuffer);

     if (lBufferSize < cb)

     {

     *pcb = lBufferSize;

     memcpy(pbBuff, *pBuffer, lBufferSize);

     }

     else

     {

     *pcb = cb;

     memcpy(pbBuff, *pBuffer, cb);

     *pBuffer += cb;

     }

     return 0;

     }