Winform开发——RichEditBox添加超链接和图片

有时候我们需要在RichEditBox控件中添加超链接进行相关的扩展，比如我们可以在RichEditBox中点击超链接打开目标网址，但是这个功能并没有在VS自带的RichEditBox控件中实现，那么我们这篇将说明如何将超链接添加到RichEditBox中，并给出添加图片的示例代码。

步骤一：RichEditBox的扩展RichEditBoxEx

using System;

using System.ComponentModel;

using System.Drawing;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace NewBeeEngine

{

public class RichTextBoxEx : RichTextBox

{

#region Interop-Defines

[StructLayout(LayoutKind.Sequential)]

private struct CHARFORMAT2_STRUCT

{

public UInt32 cbSize;

public UInt32 dwMask;

public UInt32 dwEffects;

public Int32 yHeight;

public Int32 yOffset;

public Int32 crTextColor;

public byte bCharSet;

public byte bPitchAndFamily;

[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]

public char[] szFaceName;

public UInt16 wWeight;

public UInt16 sSpacing;

public int crBackColor; // Color.ToArgb() -> int

public int lcid;

public int dwReserved;

public Int16 sStyle;

public Int16 wKerning;

public byte bUnderlineType;

public byte bAnimation;

public byte bRevAuthor;

public byte bReserved1;

}

[DllImport("user32.dll", CharSet = CharSet.Auto)]

private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

private const int WM_USER = 0x0400;

private const int EM_GETCHARFORMAT = WM_USER + 58;

private const int EM_SETCHARFORMAT = WM_USER + 68;

private const int SCF_SELECTION = 0x0001;

private const int SCF_WORD = 0x0002;

private const int SCF_ALL = 0x0004;

#region CHARFORMAT2 Flags

private const UInt32 CFE_BOLD = 0x0001;

private const UInt32 CFE_ITALIC = 0x0002;

private const UInt32 CFE_UNDERLINE = 0x0004;

private const UInt32 CFE_STRIKEOUT = 0x0008;

private const UInt32 CFE_PROTECTED = 0x0010;

private const UInt32 CFE_LINK = 0x0020;

private const UInt32 CFE_AUTOCOLOR = 0x40000000;

private const UInt32 CFE_SUBSCRIPT = 0x00010000; /* Superscript and subscript are */

private const UInt32 CFE_SUPERSCRIPT = 0x00020000; /* mutually exclusive */

private const int CFM_SMALLCAPS = 0x0040; /* (*) */

private const int CFM_ALLCAPS = 0x0080; /* Displayed by 3.0 */

private const int CFM_HIDDEN = 0x0100; /* Hidden by 3.0 */

private const int CFM_OUTLINE = 0x0200; /* (*) */

private const int CFM_SHADOW = 0x0400; /* (*) */

private const int CFM_EMBOSS = 0x0800; /* (*) */

private const int CFM_IMPRINT = 0x1000; /* (*) */

private const int CFM_DISABLED = 0x2000;

private const int CFM_REVISED = 0x4000;

private const int CFM_BACKCOLOR = 0x04000000;

private const int CFM_LCID = 0x02000000;

private const int CFM_UNDERLINETYPE = 0x00800000; /* Many displayed by 3.0 */

private const int CFM_WEIGHT = 0x00400000;

private const int CFM_SPACING = 0x00200000; /* Displayed by 3.0 */

private const int CFM_KERNING = 0x00100000; /* (*) */

private const int CFM_STYLE = 0x00080000; /* (*) */

private const int CFM_ANIMATION = 0x00040000; /* (*) */

private const int CFM_REVAUTHOR = 0x00008000;

private const UInt32 CFM_BOLD = 0x00000001;

private const UInt32 CFM_ITALIC = 0x00000002;

private const UInt32 CFM_UNDERLINE = 0x00000004;

private const UInt32 CFM_STRIKEOUT = 0x00000008;

private const UInt32 CFM_PROTECTED = 0x00000010;

private const UInt32 CFM_LINK = 0x00000020;

private const UInt32 CFM_SIZE = 0x80000000;

private const UInt32 CFM_COLOR = 0x40000000;

private const UInt32 CFM_FACE = 0x20000000;

private const UInt32 CFM_OFFSET = 0x10000000;

private const UInt32 CFM_CHARSET = 0x08000000;

private const UInt32 CFM_SUBSCRIPT = CFE_SUBSCRIPT | CFE_SUPERSCRIPT;

private const UInt32 CFM_SUPERSCRIPT = CFM_SUBSCRIPT;

private const byte CFU_UNDERLINENONE = 0x00000000;

private const byte CFU_UNDERLINE = 0x00000001;

private const byte CFU_UNDERLINEWORD = 0x00000002; /* (*) displayed as ordinary underline */

private const byte CFU_UNDERLINEDOUBLE = 0x00000003; /* (*) displayed as ordinary underline */

private const byte CFU_UNDERLINEDOTTED = 0x00000004;

private const byte CFU_UNDERLINEDASH = 0x00000005;

private const byte CFU_UNDERLINEDASHDOT = 0x00000006;

private const byte CFU_UNDERLINEDASHDOTDOT = 0x00000007;

private const byte CFU_UNDERLINEWAVE = 0x00000008;

private const byte CFU_UNDERLINETHICK = 0x00000009;

private const byte CFU_UNDERLINEHAIRLINE = 0x0000000A; /* (*) displayed as ordinary underline */

#endregion

public RichTextBoxEx()

{

// Otherwise, non-standard links get lost when user starts typing

// next to a non-standard link

this.DetectUrls = false;

}

[DefaultValue(false)]

public new bool DetectUrls

{

get { return base.DetectUrls; }

set { base.DetectUrls = value; }

}

/// <summary>

/// Insert a given text as a link into the RichTextBox at the current insert position.

/// </summary>

/// <param name="text">Text to be inserted</param>

public void InsertLink(string text)

{

InsertLink(text, this.SelectionStart);

}

/// <summary>

/// Insert a given text at a given position as a link.

/// </summary>

/// <param name="text">Text to be inserted</param>

/// <param name="position">Insert position</param>

public void InsertLink(string text, int position)

{

if (position < 0 || position > this.Text.Length)

throw new ArgumentOutOfRangeException("position");

this.SelectionStart = position;

this.SelectedText = text;

this.Select(position, text.Length);

this.SetSelectionLink(true);

this.Select(position + text.Length, 0);

}

/// <summary>

/// Insert a given text at at the current input position as a link.

/// The link text is followed by a hash (#) and the given hyperlink text, both of

/// them invisible.

/// When clicked on, the whole link text and hyperlink string are given in the

/// LinkClickedEventArgs.

/// </summary>

/// <param name="text">Text to be inserted</param>

/// <param name="hyperlink">Invisible hyperlink string to be inserted</param>

public void InsertLink(string text, string hyperlink)

{

InsertLink(text, hyperlink, this.SelectionStart);

}

/// <summary>

/// Insert a given text at a given position as a link. The link text is followed by

/// a hash (#) and the given hyperlink text, both of them invisible.

/// When clicked on, the whole link text and hyperlink string are given in the

/// LinkClickedEventArgs.

/// </summary>

/// <param name="text">Text to be inserted</param>

/// <param name="hyperlink">Invisible hyperlink string to be inserted</param>

/// <param name="position">Insert position</param>

public void InsertLink(string text, string hyperlink, int position)

{

if (position < 0 || position > this.Text.Length)

throw new ArgumentOutOfRangeException("position");

this.SelectionStart = position;

this.SelectedRtf = @"{\rtf1\ansi " + text + @"\v #" + hyperlink + @"\v0}";

this.Select(position, text.Length + hyperlink.Length + 1);

this.SetSelectionLink(true);

this.Select(position + text.Length + hyperlink.Length + 1, 0);

}

/// <summary>

/// Set the current selection's link style

/// </summary>

/// <param name="link">true: set link style, false: clear link style</param>

public void SetSelectionLink(bool link)

{

SetSelectionStyle(CFM_LINK, link ? CFE_LINK : 0);

}

/// <summary>

/// Get the link style for the current selection

/// </summary>

/// <returns>0: link style not set, 1: link style set, -1: mixed</returns>

public int GetSelectionLink()

{

return GetSelectionStyle(CFM_LINK, CFE_LINK);

}

private void SetSelectionStyle(UInt32 mask, UInt32 effect)

{

CHARFORMAT2_STRUCT cf = new CHARFORMAT2_STRUCT();

cf.cbSize = (UInt32)Marshal.SizeOf(cf);

cf.dwMask = mask;

cf.dwEffects = effect;

IntPtr wpar = new IntPtr(SCF_SELECTION);

IntPtr lpar = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));

Marshal.StructureToPtr(cf, lpar, false);

IntPtr res = SendMessage(Handle, EM_SETCHARFORMAT, wpar, lpar);

Marshal.FreeCoTaskMem(lpar);

}

private int GetSelectionStyle(UInt32 mask, UInt32 effect)

{

CHARFORMAT2_STRUCT cf = new CHARFORMAT2_STRUCT();

cf.cbSize = (UInt32)Marshal.SizeOf(cf);

cf.szFaceName = new char[32];

IntPtr wpar = new IntPtr(SCF_SELECTION);

IntPtr lpar = Marshal.AllocCoTaskMem(Marshal.SizeOf(cf));

Marshal.StructureToPtr(cf, lpar, false);

IntPtr res = SendMessage(Handle, EM_GETCHARFORMAT, wpar, lpar);

cf = (CHARFORMAT2_STRUCT)Marshal.PtrToStructure(lpar, typeof(CHARFORMAT2_STRUCT));

int state;

// dwMask holds the information which properties are consistent throughout the selection:

if ((cf.dwMask & mask) == mask)

{

if ((cf.dwEffects & effect) == effect)

state = 1;

else

state = 0;

}

else

{

state = -1;

}

Marshal.FreeCoTaskMem(lpar);

return state;

}

步骤二：添加图片

//插入图片

private void InserImg(string fileType)

{

switch (fileType.ToLower())

{

case "txt":

Image img1 = Image.FromFile("image\\TXT.bmp");

Clipboard.SetDataObject(img1, false);