C# 让RichTextBox支持GIF [收藏]

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<MemoryStream> _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
{
/// <summary>
/// RichTextBox支持 GIF图形
/// zgke@sina.com
/// qq:116149
/// </summary>
public class GifRichTextBox : RichTextBox
{
public GifRichTextBox()
{

}

/// <summary>
/// 重绘
/// </summary>
/// <param name="m"></param>
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);
}

/// <summary>
/// 添加一个文件资源到RTF数据
/// </summary>
/// <param name="p_FileFullPath">文件路径</param>
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();
}

/// <summary>
/// 获取选择的文件
/// </summary>
/// <returns>文件列表</returns>
public IList<MemoryStream> LoadSelectFile()
{
IList<MemoryStream> _FileList = new List<MemoryStream>();
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;
}

/// <summary>
/// 获取图形或则改动PictureBox的位置
/// </summary>
/// <param name="p_Rtf"></param>
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";
}
}

/// <summary>
/// 根据RTF保存的内容获取内存流
/// </summary>
/// <param name="p_Text">RTF</param>
/// <param name="p_Index">开始位置</param>
/// <param name="p_Count">读取数量</param>
/// <returns>内存流</returns>
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;
}

/// <summary>
/// 获取RICHTEXTBOX所有图形的位置
/// </summary>
/// <param name="p_RichTextBox">RICHTEXTBOX</param>
/// <returns>位置信息</returns>
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();
}
}
}