RichEdit 小结

一般性问题
1.    代码编译通过了，运行后RichEdit控件不显示，在InitInstance中添加
BOOL CWinApp::InitInstance ()
{
…
AfxInitRichEdit(); - RichEdit 1.0
或 AfxInitRichEdit2(); - RichEdit 2.0
…
}
 
2.    升级默认的RichEdit版本，默认的版本有BUG，在InitInstance中添加
BOOL CWinApp::InitInstance ()
{
…
LoadLibrary("RICHED20.DLL");
…
FreeLibrary();
}
 
如果是CRichEditView基类的话，可用如下消息机制:
BOOL CRichEditView::PreCreateWindow(CREATESTRUCT& cs)
{
if (LoadLibraryA("RICHED20.DLL") == NULL)
{
AfxMessageBox(_T("Fail to load \"riched20.dll\"."),MB_OK | MB_ICONERROR);
PostMessage(WM_QUIT,0,0);
return FALSE;
}
 
m_strClass = RICHEDIT_CLASSA;
return CRichEditView::PreCreateWindow(cs);
}
 
3.    在RichEdit控件的输入框中最后追加一行

（需要先设置RichEdit属性MultiLine为True）
CRichEditCtrl.SetSel(-1, -1);
CRichEditCtrl.ReplaceSel((LPCTSTR)str);
 
4.    限制RichEdit控件的字数
CRichEditCtrl.LimitText(long nChars)
 
5.    设置RichEdit控件的换行切换
如果是CRichEditView基类的话，可用如下消息机制:
BOOL CRichEditView::OnInitialUpdate()
{
…
m_nWordWrap = WrapNone;
WrapChanged();
…
}
 
如果是在Dialog，可使用SetTargetDevice，并在RichEdit的属性里面加上want return
CRichEditCtrl.SetTargetDevice(m_dcTarget, GetPrintWidth());
 
WrapChanged实际上也是调用
CRichEditCtrl.SetTargetDevice(NULL, 0); //m_nWordWrap == WrapToWindow
CRichEditCtrl.SetTargetDevice(NULL, 1); //m_nWordWrap == WrapNone
CRichEditCtrl.SetTargetDevice(NULL, 2);// m_nWordWrap == WrapToTargetDevice
 
6.    设置RichEdit控件不带格式的数据粘贴
CRichEditCtrl.PasteSpecial(CF_TEXT);
 
7.    设置RichEdit控件的滚动条自动随输入滚动到最后一行
int nFirstVisible = CRichEditCtrl.GetFirstVisibleLine();
if (nFirstVisible > 0)
{
CRichEditCtrl.LineScroll(-nFirstVisible, 0);
}
或CRichEditCtrl.PostMessage(WM_VSCROLL, SB_BOTTOM, 0);

8.设置RichEdit控件的撤销输入次数(只能用在RICHED20以上)
SendMessage(EM_SETTEXTMODE, TM_MULTILEVELUNDO, 0);
SendMessage(EM_SETUNDOLIMIT, 100, 0);
TM_MULTILEVELUNDO 支持多取消(默认值)，可通过EM_SETUNDOLIMIT设置最大次数
 
9.设置RichEdit控件的OnChange事件
EM_SETEVENTMASK 设置 ENM_CHANGE
long lMask = GetEventMask();
lMask |= ENM_CHANGE;
lMask &= ~ENM_PROTECTED;
SetEventMask(lMask);
 
10.设置RichEdit控件的只读属性
CRichEditCtrl::SetReadOnly(BOOL bReadOnly = TRUE );
通过设置PROTECTED实现选中的文本只读，参见如下文章：
http://www.codeguru.com/Cpp/controls/richedit/article.php/c2401/
 
 
函数应用
1. 设置RichEdit控件的显示字体
CHARFORMAT cf;
ZeroMemory(&cf, sizeof(CHARFORMAT));
cf.cbSize = sizeof(CHARFORMAT);
cf.dwMask|=CFM_BOLD;
cf.dwEffects|=CFE_BOLD; //粗体，取消用cf.dwEffects&=~CFE_BOLD;
cf.dwMask|=CFM_ITALIC;
cf.dwEffects|=CFE_ITALIC; //斜体，取消用cf.dwEffects&=~CFE_ITALIC;
cf.dwMask|=CFM_UNDERLINE;
cf.dwEffects|=CFE_UNDERLINE; //斜体，取消用cf.dwEffects&=~CFE_UNDERLINE;
cf.dwMask|=CFM_COLOR;
cf.crTextColor = RGB(255,0,0); //设置颜色
cf.dwMask|=CFM_SIZE;
cf.yHeight =200; //设置高度
cf.dwMask|=CFM_FACE;
strcpy(cf.szFaceName ,_T("隶书")); //设置字体
CRichEditCtrl.SetSelectionCharFormat(cf);
 
2.设置RichEdit控件的显示字体的行间距（只能用在RICHED20以上）
PARAFORMAT2 pf;
pf.cbSize = sizeof(PARAFORMAT2);
pf.dwMask = PFM_NUMBERING | PFM_OFFSET;
pf.wNumbering = PFN_BULLET; //注意PFM_NUMBERING
pf.dxOffset = 10;
VERIFY(SetParaFormat(pf));
 
常用的dwMask有如下列表：
PFM_NUMBERING 成员 wNumbering 才起作用
1 项目符号，默认用PFN_BULLET.
2 使用阿拉伯数字 (1, 2, 3, ...).
3 使用小写字母 (a, b, c, ...).
4 使用大写字母 (A, B, C, ...).
5 使用小写罗马数字 (i, ii, iii, ...).
6 使用大写罗马数字 (I, II, III, ...).
7 自定义，字符见成员 wNumberingStart.
PFM_OFFSET 成员 dxOffset 才起作用，缩进，单位twips
PFM_STARTINDENT 成员 dxStartIndent 才起作用，首行缩进
PFM_SPACEAFTER 成员 dySpaceAfter 才起作用，段间距
PFM_LINESPACING 成员 dyLineSpacing 才起作用，行间距
 
3.设置RichEdit控件的透明背景（只能用在RICHED20以上）
long style = ::GetWindowLong(GetSafeHwnd(), GWL_EXSTYLE);
style &= WS_EX_TRANSPARENT;
::SetWindowLong(GetSafeHwnd(), GWL_EXSTYLE, style);
或 CreateEx()，然后把WS_EX_TRANSPARENT样式加上
 
4.获取或者写入RichEdit控件的内容
Ø         GetWindowText
Ø         使用EM_GETTEXTEX
GETTEXTEX gt;
gt.cb = 200;
gt.flags = GT_DEFAULT;
gt.codepage = CP_ACP ;
gt.lpDefaultChar = NULL;
gt.lpUsedDefChar = NULL;
SendMessage(EM_GETTEXTEX,(WPARAM)>,(LPARAM)text);
Ø         StreamOut(主要用于RTF等格式输出)
static DWORD CALLBACK；
MyStreamOutCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
CFile* pFile = (CFile*) dwCookie;
pFile->Write(pbBuff, cb);
*pcb = cb;
return 0;
}
CFile cFile(TEXT("myfile.rtf"), CFile::modeCreate|CFile::modeWrite);
EDITSTREAM es;
es.dwCookie = (DWORD) &cFile; //设置用例参数,以便回调函数调用
es.pfnCallback = MyStreamOutCallback;
pmyRichEditCtrl->StreamOut(SF_RTF, es);
 
读入可以此类推，SetWindowText, EM_SETTEXTEX, StreamIn
 
5.查找RichEdit控件中的字符串
FINDTEXTEX ft;
ft.chrg.cpMin = 0;
ft.chrg.cpMax = -1;
ft.lpstrText = "|";
long lPos = FindText(0, &ft);
 
如果要继续查找，修改cpMin,如
int nCount = 0;
do
{
long lPos = GetRichEditCtrl().FindText(0, &ft);
if( -1 == lPos) break;
ft.chrg.cpMin = lPos + strlen(ft.lpstrText);
++nCount;
}while(TRUE);
 
6. 以Html格式保存RichEdit控件中的内容
临时做法可先转为RTF格式，再通过RTF-to-HTML Converter，参考如下文章：
http://www.codeguru.com/Cpp/controls/richedit/conversions/article.php/c5377/
 
8.    重载OnProtected函数以得到RichEdit对应的消息，如粘贴等
 
void CRichEditorView::OnProtected(NMHDR* pNMHDR, LRESULT* pResult)
{
ENPROTECTED* pEP = (ENPROTECTED*)pNMHDR;
switch (pEP->msg)
{
case WM_KEYDOWN: //按键，判断pEP->wParam
case WM_PASTE: //粘贴
case WM_CUT: //剪切
case EM_SETCHARFORMAT:
default:
break;
};
*pResult = FALSE;
}
 
 
聊天常用
1. 设置RichEdit控件的链接功能（只能用在RICHED20以上）
Ø         LoadLibrary(_T("Riched20.dll"));
Ø         创建RichEdit2.0控件
CreateEx(0, _T("RichEdit20A"), NULL, WS_CHILD|WS_VISIBLE|WS_VSCROLL|WS_TABSTOP |ES_READONLY|ES_WANTRETURN|ES_MULTILINE, rect.left, rect.top, cx, cy, pParentWnd->m_hWnd, (HMENU)nID, NULL);
Ø         设置选中的文字为链接显示
CHARFORMAT2 cf2;
ZeroMemory(&cf2, sizeof(CHARFORMAT2));//
cf2.cbSize = sizeof(CHARFORMAT2);
cf2.dwMask = CFM_LINK;
cf2.dwEffects |= CFE_LINK;
m_cRichEdit.SendMessage(EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM)&cf2);
Ø         支持链接的点击响应
m_cRichEdit.SetEventMask(ENM_LINK);
Ø         响应链接的点击EN_LINK
BEGIN_MESSAGE_MAP(CMyRichEdit, CRichEditCtrl)
ON_NOTIFY_REFLECT(EN_LINK, OnURL)
END_MESSAGE_MAP()
......
void CMyRichEdit::OnURLClick(NMHDR *pNmhdr, LRESULT *pResult)
{
TCHAR LinkChar[512];
ENLINK *pLink = (ENLINK *)pNmhdr;
if (pLink->msg == WM_LBUTTONUP)
{
SetSel(penLink->chrg); //这是链接的文字范围
long Res = GetSelText((char *)LinkChar); //这是链接文字
…
}
}
Ø         自动识别链接
UINT nMask = SendDlgItemMessage(IDC_RICHEDIT_MESSAGE, EM_GETEVENTMASK, 0, 0);
SendDlgItemMessage(IDC_RICHEDIT_MESSAGE, EM_SETEVENTMASK, 0, nMask | NM_LINK);
SendDlgItemMessage(IDC_RICHEDIT_MESSAGE, EM_AUTOURLDETECT, TRUE, 0);
BOOL OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
NMHDR* pNmHdr = (NMHDR *)lParam;
if(pNmHdr->idFrom == IDC_RICHEDIT_MESSAGE && pNmHdr->code == EN_LINK)
{
ENLINK *pLink = (ENLINK *)lParam;
if (pLink->msg == WM_LBUTTONDOWN)
{
SendDlgItemMessage(IDC_RICHEDIT_MESSAGE, EM_EXSETSEL, 0, (LPARAM)&(pLink->chrg));
ShellExecute(GetSafeHwnd(), "open", m_wndREMessage.GetSelText(), 0, 0, SW_SHOWNORMAL);
}
}
return CDialog::OnNotify(wParam, lParam, pResult);
}
 
2.在RichEdit中插入位图
Ø         参考如下文章：
http://www.codeguru.com/Cpp/controls/richedit/article.php/c2417/
http://www.codeguru.com/Cpp/controls/richedit/article.php/c5383/
 
Ø         自定义在RichEdit中插入对象的图标
http://www.blogcn.com/user3/jiangsheng/blog/1319738.html
http://www.codeguru.com/richedit/richeditrc.html
 
3.在RichEdit显示GIF动画
Ø         常用的是通过QQ的imageole.dll(也有用Gif89.dll的)
http://www.xiaozhou.net/cooldog/blogview.asp?logID=82
http://www.codeproject.com/richedit/AnimatedEmoticon.asp
Ø         在richedit控件中插入动态GIF(Native C++版)
http://blog.joycode.com/jiangsheng/archive/2004/12/15/41209.aspx
 
4.IRichEditOleCallback的使用
http://61.186.252.131/Expert/topic/905/905844.xml?temp=.8379022
 
5.类似MSN信息发送框的制作(上)
http://www.vckbase.com/document/viewdoc/?id=1087
内容包含：实现右键菜单，图片插入，读取/写入RTF格式字符串
 
6.自定义RichEdit控件
http://www.vckbase.com/document/viewdoc/?id=328
内容包含：鼠标右键消息，消息映射，字体变换

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