C# 让RichTextBox支持GIF

感觉很有用~~

使用方法
//获取选择的图形 并且保存出来
private void button2_Click(object sender, EventArgs e)
{
IList _List = gifRichTextBox1.LoadSelectFile();
for (int i = 0; i != _List.Count; i++)
{
File.WriteAllBytes(@"C:\Temp\A" + i.ToString() + ".gif", _List[0].ToArray());
}
}
//添加一个GIF图形
private void button3_Click(object sender, EventArgs e)
{
gifRichTextBox1.AddFile(@"C:\Temp\0.gif");
}
//获取当前的RTF文字 你可以直接保存这个到数据库 或则通过SOCKET发送出去.
string _Text = "";
private void button1_Click(object sender, EventArgs e)
{
_Text = gifRichTextBox1.Rtf;

}
//重新显示RTF内容
private void button4_Click(object sender, EventArgs e)
{
gifRichTextBox1.Rtf = _Text;
}
如果没有这个类..保存出的RTF数据..在其他RTF浏览的时候可能是个白色的矩形..
下面是全部的类
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Windows.Forms;
using System.Drawing;
namespace Zgke.WindowFrom.Window.Controls.UserControls
{
///
/// RichTextBox支持 GIF图形
/// zgke@sina.com
/// qq:116149
///
public class GifRichTextBox : RichTextBox
{
public GifRichTextBox()
{

}
///
/// 重绘
///
///
protected override void WndProc(ref Message m)
{
if (m.Msg == 0xF)
{
foreach (Control _SubControl in base.Controls)
{
_SubControl.Tag = "1";
}
GetRichTextObjRectangle();
for (int i = 0; i != base.Controls.Count; i++)
{
if (base.Controls[i].Tag.ToString() == "1")
{
base.Controls.RemoveAt(i);
i--;
}
}
}
base.WndProc(ref m);
}
///
/// 添加一个文件资源到RTF数据
///
/// 文件路径
public void AddFile(string p_FileFullPath)
{
byte[] _FileBytes = File.ReadAllBytes(p_FileFullPath);
Image _Image = Image.FromStream(new MemoryStream(_FileBytes));
string _Guid = BitConverter.ToString(Guid.NewGuid().ToByteArray()).Replace("-", "");

StringBuilder _RtfText = new
StringBuilder(@"{\rtf1\ansi\ansicpg936\deff0\deflang1033\deflangfe2052{\fonttbl{\f0\fnil\fcharset134

\'cb\'ce\'cc\'e5;}}\uc1\pard\lang2052\f0\fs18{\object\objemb{\*\objclass
Paint.Picture}");
int _Width = _Image.Width * 15;
int _Height = _Image.Height * 15;
_RtfText.Append(@"\objw" + _Width.ToString() + @"\objh" + _Height.ToString());
_RtfText.AppendLine(@"{\*\objdata");

_RtfText.AppendLine(@"010500000200000007000000504272757368000000000000000000"
+ BitConverter.ToString(BitConverter.GetBytes(_FileBytes.Length +
20)).Replace("-", ""));
_RtfText.Append("7A676B65" + _Guid); //标记
_RtfText.AppendLine(BitConverter.ToString(_FileBytes).Replace("-", ""));
_RtfText.AppendLine(@"0105000000000000}{\result{\pict\wmetafile0}}}}");
base.SelectedRtf = _RtfText.ToString();
}
///
/// 获取选择的文件
///
/// 文件列表
public IList LoadSelectFile()
{
IList _FileList = new List();
int _Index = base.SelectedRtf.IndexOf(@"{\*\objdata");
if (_Index == -1) return _FileList;
while (_Index != -1)
{
MemoryStream _File = new MemoryStream();
_Index += 80;
string _LengthText = base.SelectedRtf.Substring(_Index, 8);
int _Length = BitConverter.ToInt32(new byte[] {
Convert.ToByte(_LengthText.Substring(0, 2), 16),
Convert.ToByte(_LengthText.Substring(2, 2), 16),
Convert.ToByte(_LengthText.Substring(4, 2), 16),
Convert.ToByte(_LengthText.Substring(6, 2), 16) }, 0);
_Index += 10;
string _Head = base.SelectedRtf.Substring(_Index, 8);
if (_Head.ToUpper() == "7A676B65")
{
_Index += 40;
_Length -= 20;
int _EndIndex = base.SelectedRtf.IndexOf("01050000", _Index);
int _ReadIndex = 0;

_FileList.Add(LoadMemoryStream(base.SelectedRtf.Substring(_Index,
_EndIndex - _Index), ref _ReadIndex, _Length));
_Index = _EndIndex;
}
_Index = base.SelectedRtf.IndexOf(@"{\*\objdata", _Index);
}
return _FileList;
}
///
/// 获取图形或则改动PictureBox的位置
///
///
private void PointFile(string p_Rtf, Point p_StarPoint, int p_Width, int p_Height)
{
int _Index = p_Rtf.IndexOf(@"{\*\objdata");
if (_Index == -1) return;
_Index += 80;
string _LengthText = p_Rtf.Substring(_Index, 8);
int _Length = BitConverter.ToInt32(new byte[] {
Convert.ToByte(_LengthText.Substring(0, 2), 16),
Convert.ToByte(_LengthText.Substring(2, 2), 16),
Convert.ToByte(_LengthText.Substring(4, 2), 16),
Convert.ToByte(_LengthText.Substring(6, 2), 16) }, 0);
_Index += 10;
string _Head = p_Rtf.Substring(_Index, 8);
if (_Head.ToUpper() != "7A676B65") return; //如果不是标记出来的 就不生成PictureBox
_Index += 8;
string _Guid = p_Rtf.Substring(_Index, 32);
Control _Controls = base.Controls[_Guid];
if (_Controls == null)
{
PictureBox _PictureBox = new PictureBox();
_PictureBox.Name = _Guid;
_PictureBox.Tag = "0";
_PictureBox.Location = p_StarPoint;
_PictureBox.Size = new Size(p_Width, p_Height);
_Index += 32;
_Length -= 20;
_PictureBox.Image = Image.FromStream(LoadMemoryStream(p_Rtf, ref _Index,_Length));
base.Controls.Add(_PictureBox);
}
else
{
_Controls.Location = p_StarPoint;
_Controls.Size = new Size(p_Width, p_Height);
_Controls.Tag = "0";
}
}
///
/// 根据RTF保存的内容获取内存流
///
/// RTF
/// 开始位置
/// 读取数量
/// 内存流
private MemoryStream LoadMemoryStream(string p_Text,ref int p_Index,int p_Count)
{
MemoryStream _File =new MemoryStream();
char[] _Text = p_Text.ToCharArray();
for (int i = 0; i != p_Count; i++)
{
if (_Text[p_Index] == '\r' && _Text[p_Index + 1] == '\n')
{
i--;
}
else
{
_File.WriteByte(Convert.ToByte(_Text[p_Index].ToString() + _Text[p_Index + 1].ToString(), 16));
}
p_Index += 2;
}
return _File;
}

///
/// 获取RICHTEXTBOX所有图形的位置
///
/// RICHTEXTBOX
/// 位置信息
private void GetRichTextObjRectangle()
{
RichTextBox _RichText = new RichTextBox();
_RichText.Rtf = base.Rtf;
int _Count = base.Text.Length;
for (int i = 0; i != _Count; i++)
{
if (base.Text[i] == ' ')
{
_RichText.Select(i, 1);
if (_RichText.SelectionType.ToString() == "Object")
{
Point _StarPoint = base.GetPositionFromCharIndex(i);
System.Text.RegularExpressions.Regex
_RegexWidth = new
System.Text.RegularExpressions.Regex(@"(?<=\\objw)[^\\]+");

System.Text.RegularExpressions.Regex _RegexHeight = new
System.Text.RegularExpressions.Regex(@"(?<=\\objh)[^{]+");
int _Width = 0;
int _Height = 0;
if
(int.TryParse(_RegexWidth.Match(_RichText.SelectedRtf).Value, out
_Width) &&
int.TryParse(_RegexHeight.Match(_RichText.SelectedRtf).Value, out
_Height))
{
_Width = _Width / 15;
_Height = _Height / 15;
PointFile(_RichText.SelectedRtf, _StarPoint, _Width, _Height);
}
}
}
}
_RichText.Dispose();
}
}
}

原文链接：http://tech.http://www.51cto.com/articles/2009/730/1248919705449_1.html