CEdit & CRichEdit 提示

.設定edit唯讀屬性

    方法一：
                m_edit1.SetReadOnly(TRUE);
    方法二：
                ::SendMessage(m_edit1.m_hWnd, EM_SETREADONLY, TRUE, 0);

2.判斷edit中游標狀態並得到選中內容(richedit同樣適用)

        int nStart, nEnd;
        CString strTemp;

        m_edit1.GetSel(nStart, nEnd);
        if(nStart == nEnd)
        {
            strTemp.Format(_T("游標在%d"), nStart);
            AfxMessageBox(strTemp);
        }
        else
        {
            //得到edit選中的內容    
            m_edit1.GetWindowText(strTemp);
            strTemp = strTemp.Mid(nStart) - strTemp.Mid(nEnd);
            AfxMessageBox(strTemp);
        }
    註：GetSel後，如果nStart和nEnd，表明游標處於某個位置（直觀來看就是游標在閃動）；
             如果nStart和nEnd不相等，表明使用者在edit中選中了一段內容。

3.在edit最後添加字串

        CString str;
        m_edit1.SetSel(-1, -1);
        m_edit1.ReplaceSel(str);

4.隨輸入自動滾動到最後一行(richedit同樣適用)

    方法一：（摘自msdn）
        // The pointer to my edit.
        extern CEdit* pmyEdit;
        int nFirstVisible = pmyEdit->GetFirstVisibleLine();

        // Scroll the edit control so that the first visible line
        // is the first line of text.
        if (nFirstVisible > 0)
        {
            pmyEdit->LineScroll(-nFirstVisible, 0);
        }
    方法二：
        m_richedit.PostMessage(WM_VSCROLL, SB_BOTTOM, 0);

5.如何限制edit輸入指定字元

   可以從CEdit派生一個類，添加WM_CHAR訊息映射。下面一個例子實現了限定輸入16進位字元的功能。

   void CMyHexEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
   {
        if ( (nChar >= '0' && nChar <= '9') ||
             (nChar >= 'a' && nChar <= 'f') ||
             (nChar >= 'A' && nChar <= 'F') ||
              nChar == VK_BACK || 
              nChar == VK_DELETE)    //msdn的virtual key
       {
            CEdit::OnChar(nChar, nRepCnt, nFlags);
        }     
   }

6.如何使用richedit

    添加AfxInitRichEdit();
       CxxxApp::InitInstance()
        {
             AfxInitRichEdit();
          .............
       }

   AfxInitRichEdit()功能：裝載 RichEdit 1.0 Control (RICHED32.DLL).

7.如何使用richedit2.0 or richedit3.0

    使用原因：由於RichEdit2.0A自動為寬字元（WideChar），所以它可以解決中文亂碼以及一些漢字問題

    方法一：（msdn上的做法，適用於用VC.NET及以後版本建立的工程）
            To update rich edit controls in existing Visual C++ applications to version 2.0,
            open the .RC file as text, change the class name of each rich edit control from   "RICHEDIT" to  "RichEdit20a".
            Then replace the call to AfxInitRichEdit with AfxInitRichEdit2.
    方法二：以對話方塊為例：
       (1)    增加一全域變數 HMODULE hMod;
       (2)    在CxxxApp::InitInstance()中添加一句hMod = LoadLibrary(_T("riched20.dll"));
              在CxxxApp::ExitInstance()中添加一句FreeLibrary(hMod);
       (3)      在對話方塊上放一個richedit，文本方式開啟.rc檔案修改該richedit控制項的類名"RICHEDIT" to  "RichEdit20a".
       (4)      在對話方塊標頭檔添加 CRichEditCtrl m_richedit;
              在OnInitDialog中添加 m_richedit.SubclassDlgItem(IDC_RICHEDIT1, this);

8.改變richedit指定地區的顏色及字型

        CHARFORMAT cf;
        ZeroMemory(&cf, sizeof(CHARFORMAT));
        cf.cbSize = sizeof(CHARFORMAT);
        cf.dwMask = CFM_BOLD | CFM_COLOR | CFM_FACE |
                            CFM_ITALIC | CFM_SIZE | CFM_UNDERLINE;
        cf.dwEffects = 0;
        cf.yHeight = 12*12;//文字高度
        cf.crTextColor = RGB(200, 100, 255); //文字顏色
        strcpy(cf.szFaceName ,_T("隸書"));//設定字型
    
        m_richedit1.SetSel(1, 5); //設定處理地區
        m_richedit1.SetSelectionCharFormat(cf);

9.設定行間距（只適用於richedit2.0）

        PARAFORMAT2 pf;
        pf2.cbSize = sizeof(PARAFORMAT2);
        pf2.dwMask = PFM_LINESPACING | PFM_SPACEAFTER;
        pf2.dyLineSpacing = 200;
        pf2.bLineSpacingRule  = 4;
        m_richedit.SetParaFormat(pf2);

10.richedit插入位元影像

Q220844：How to insert a bitmap into an RTF document using the RichEdit control in Visual C++ 6.0
http://support.microsoft.com/default.aspx?scid=kb;en-us;220844
http://www.codeguru.com/Cpp/controls/richedit/article.php/c2417/
http://www.codeguru.com/Cpp/controls/richedit/article.php/c5383/

11.richedit插入gif動畫

http://www.codeproject.com/richedit/AnimatedEmoticon.asp

12.richedit嵌入ole對象

http://support.microsoft.com/kb/141549/en-us

13.使richedit選中內容唯讀

http://www.codeguru.com/cpp/controls/richedit/article.php/c2401/

14.列印richedit

http://www.protext.com/MFC/RichEdit3.htm

15.richeidt用於聊天訊息視窗

http://www.vckbase.com/document/viewdoc/?id=1087
http://www.codeproject.com/richedit/chatrichedit.asp
http://www.codeguru.com/Cpp/controls/richedit/article.php/c2395/

16.解決richedit的EN_SETFOCUS和EN_KILLFOCUS無響應的問題

http://support.microsoft.com/kb/181664/en-us

17.richedit拼字檢查

http://www.codeproject.com/com/AutoSpellCheck.asp

18.改變edit背景色

Q117778：How to change the background color of an MFC edit control
http://support.microsoft.com/kb/117778/en-us

19.當edit控制項的父視窗屬性是帶標題列WS_CAPTION和子視窗WS_CHILD時，不能設定焦點SetFocus

Q230587：PRB: Can't Set Focus to an Edit Control When its Parent Is an Inactive Captioned Child Window
http://support.microsoft.com/kb/230587/en-us

20. 在Edit中斷行符號時，會退出對話方塊 

選中Edit的風格Want Return。

MSDN的解釋如下：
ES_WANTRETURN   Specifies that a carriage return be inserted when the user presses the ENTER key while entering text into a multiple-line edit control in a dialog box. Without this style, pressing the ENTER key has the same effect as pressing the dialog box's default pushbutton. This style has no effect on a single-line edit control.

21. 動態建立的edit沒有邊框的問題

    m_edit.Create(....);
    m_edit.ModifyStyleEx(0, WS_EX_CLIENTEDGE, SWP_DRAWFRAME);

22. 一個能顯示RTF，ole（包括gif， wmv，excel ，ppt）的例子

http://www.codeproject.com/richedit/COleRichEditCtrl.asp