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CEdit & CRichEdit 使用技巧

2009-11-12 14:29 381 查看
CEdit & CRichEdit 使用技巧

注:

m_edit1代表ID为IDC_EDIT1的CEdit控件的control类型的变量

m_richedit1代表ID为IDC_RICHEDIT1的CRichEditCtrl控件的control类型的变量

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.

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

EN_SETFOCUS

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.

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
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