作者在 2009-09-13 09:18:57 发布以下内容

MFC中的CEdit与CRichEdit使用技巧

from http://hi.baidu.com/zhanglei_186/blog/item/2654340164cfab021c9583fe.html

VC中在对话框上使用Rich Edit控件前一定要用AfxInitRichEdit()初始化RichEdit环境.

1.设置edit只读属性

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

2.判断edit中光标状态并得到选中内容(richedit同样适用)

        int nStart, nEnd;
        CString strTemp;

        m_edit1.GetSel(nStart, nEnd);
        if(nStart == nEnd)
        {
            strTemp.Format(_T("光标在%d"), nStart);
            AfxMessageBox(strTemp);
        }
        else
        {
            //得到edit选中的内容
            m_edit1.GetWindowText(strTemp);
            strTemp = strTemp.Mid(nStart) - strTemp.Mid(nEnd);
            AfxMessageBox(strTemp);
        }
    注：GetSel后，如果nStart和nEnd，表明光标处于某个位置（直观来看就是光标在闪动）；
             如果nStart和nEnd不相等，表明用户在edit中选中了一段内容。

3.在edit最后添加字符串

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

4.随输入自动滚动到最后一行(richedit同样适用)

    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输入指定字符

   可以从CEdit派生一个类，添加WM_CHAR消息映射。下面一个例子实现了限定输入16进制字符的功能。

   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：装载 RichEdit 1.0 Control (RICHED32.DLL).

7.如何使用richedit2.0 or richedit3.0

    使用原因：由于RichEdit2.0A自动为宽字符（WideChar），所以它可以解决中文乱码以及一些汉字问题

    方法一：（msdn上的做法，适用于用VC.NET及以后版本创建的工程）
            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：以对话框为例：
       (1)    增加一全局变量 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)    在对话框上放一个richedit，文本方式打开.rc文件修改该richedit控件的类名"RICHEDIT" to "RichEdit20a".
       (4)    在对话框头文件添加 CRichEditCtrl m_richedit;
            在OnInitDialog中添加 m_richedit.SubclassDlgItem(IDC_RICHEDIT1, this);

8.改变richedit指定区域的颜色及字体

        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); //文字颜色
        strcpy(cf.szFaceName ,_T("隶书"));//设置字体

        m_richedit1.SetSel(1, 5); //设置处理区域
        m_richedit1.SetSelectionCharFormat(cf);

9.设置行间距（只适用于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插入位图

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动画

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

12.richedit嵌入ole对象

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

13.使richedit选中内容只读

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

14.打印richedit

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

15.richeidt用于聊天消息窗口

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.解决richedit的EN_SETFOCUS和EN_KILLFOCUS无响应的问题

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

17.richedit拼写检查

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

18.改变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.当edit控件的父窗口属性是带标题栏WS_CAPTION和子窗口WS_CHILD时，不能设置焦点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中回车时，会退出对话框

选中Edit的风格Want Return。

MSDN的解释如下：
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. 动态创建的edit没有边框的问题

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

22. 一个能显示RTF，ole（包括gif， wmv，excel ，ppt）的例子

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

转自

http://blog.csdn.net/lixiaosan/archive/2006/04/06/652795.aspx

Environment: VC6 SP4, 2000.

Follow these 10 easy steps to build the OutLookRichEdit control:

Insert a rich edit control into the dialog.
Call AfxInitRichEdit() in the InitInstance of the App class or in InitDialog.
If it does not exist, copy OutLookRichEdit.cpp and OutLookRichEdit.h to the project directory.
Click the menu choice Project-Add to Project-Files and select the above-copied files to add the wrapper class to your project.
Import the hand cursor into the resource and rename it "IDC_LINK".
Use Classwizard to add a member variable of the rich edit control (CRichEditCtrl).
Include the OutLookRichEdit.h file in the dialog's header file and change the declaration of rich edit member variable, as in
```
CRichEditCtrl    m_ctrlText1;
```
to
```
COutLookRichEdit m_ctrlText1;
```
In InitDialog(), add the following code.
```
m_ctrlText1.SetRawHyperText(_T("Click <%$here$#100#%>
                                to see the about box."));
```
At this level, if you build the project and run it, you can see the rich edit control with linked text, but nothing would happen if you clicked on the link.

To Show a dialog while the link is clicked, you have to add some more code in the dialog class. Before that, have a closer look at the preceding code and hypertext syntax. The link text is enclosed between the "$" symbols and the corresponding dialog's resource value 100 (About Box), enclosed in "#" symbols.

You can find the #define values of dialogs in the resource.h file.

Use ClassWizard to map OnNotify of the dialog and write the corresponding implementation code in .cpp file, like:

BOOL CDEMODlg::OnNotify(WPARAM wParam,
                        LPARAM lParam,
                        LRESULT* pResult)
{
  NMHDR* pNmHdr = (NMHDR*) lParam;
  if(IDC_RICHEDIT1 == pNmHdr->idFrom){
    switch(pNmHdr->code)
    {
      case IDD_ABOUTBOX:
        CAboutDlg oDlg;
        oDlg.DoModal ();
        break;
    }
  }
  return CDialog::OnNotify(wParam, lParam, pResult);
}

Now, build and run the project. It is recommended that you set the read-only attribute to the rich edit control.

Downloads

Download demo project - 23 Kb
Download source - 6 Kb

在RichEdit中插入Bitmap

COleDataSource src;
STGMEDIUM sm;
sm.tymed=TYMED_GDI;
sm.hBitmap=hbmp;
sm.pUnkForRelease=NULL;
src.CacheData(CF_BITMAP, &sm);
LPDATAOBJECT lpDataObject =
(LPDATAOBJECT)src.GetInterface(&IID_IDataObject);
pRichEditOle->ImportDataObject(lpDataObject, 0, NULL);
lpDataObject->Release();

字体设置代码

最后添加字体变换函数：
CHARFORMAT cf;
LOGFONT lf;
memset(&cf, 0, sizeof(CHARFORMAT));
memset(&lf, 0, sizeof(LOGFONT));

//判断是否选择了内容
BOOL bSelect = (GetSelectionType() != SEL_EMPTY) ? TRUE : FALSE;
if (bSelect)
{
             GetSelectionCharFormat(cf);
}
else
{
             GetDefaultCharFormat(cf);
}

//得到相关字体属性
BOOL bIsBold = cf.dwEffects & CFE_BOLD;
BOOL bIsItalic = cf.dwEffects & CFE_ITALIC;
BOOL bIsUnderline = cf.dwEffects & CFE_UNDERLINE;
BOOL bIsStrickout = cf.dwEffects & CFE_STRIKEOUT;

//设置属性
lf.lfCharSet = cf.bCharSet;
lf.lfHeight = cf.yHeight/15;
lf.lfPitchAndFamily = cf.bPitchAndFamily;
lf.lfItalic = bIsItalic;
lf.lfWeight = (bIsBold ? FW_BOLD : FW_NORMAL);
lf.lfUnderline = bIsUnderline;
lf.lfStrikeOut = bIsStrickout;
sprintf(lf.lfFaceName, cf.szFaceName);


CFontDialog dlg(&lf);
dlg.m_cf.rgbColors = cf.crTextColor;
if (dlg.DoModal() == IDOK)
{
             dlg.GetCharFormat(cf);//获得所选字体的属性
             if (bSelect)
                         SetSelectionCharFormat(cf);     //为选定的内容设定所选字体
             else
                         SetWordCharFormat(cf);         //为将要输入的内容设定字体
}

在RichEdit中实现超链接

责任编辑：admin 　在CBuilder上制作更新日期：2005-8-6

首先在Form上放置一个RichEdit。

在窗体的构造函数中添加以下代码：
__fastcall TMainForm::TMainForm(TComponent* Owner)
         : TForm(Owner)
{
     unsigned mask = SendMessage(RichEdit1->Handle, EM_GETEVENTMASK, 0, 0);
     SendMessage(RichEdit1->Handle, EM_SETEVENTMASK, 0, mask | ENM_LINK);
     SendMessage(RichEdit1->Handle, EM_AUTOURLDETECT, true, 0);   //自动检测URL

     RichEdit1->Text = "欢迎访问C++ Builder\n"
                       "网址: http://www.ccrun.com\n"
                       "偶的信箱:\n"
                       "mailto::info@ccrun.com \n"
                       "嘿嘿\n";
}

重载窗体的WndProc

1。在.h中添加：

    protected:
       virtual void __fastcall WndProc(Messages::TMessage &Message);

2。在.cpp中添加：
//---------------------------------------------------------------------------
void __fastcall TMainForm::WndProc(Messages::TMessage &Message)
{
     if (Message.Msg == WM_NOTIFY)
     {
         if (((LPNMHDR)Message.LParam)->code == EN_LINK)
         {
             ENLINK* p = (ENLINK *)Message.LParam;
             if (p->msg == WM_LBUTTONDOWN)
             {
                 SendMessage(RichEdit1->Handle, EM_EXSETSEL, 0, (LPARAM)&(p->chrg));
                 ShellExecute(Handle, "open", RichEdit1->SelText.c_str(), 0, 0, SW_SHOWNORMAL);
             }
         }
     }
     TForm::WndProc(Message);
}