C# 让RichTextBox支持GIF

2021-09-22 01:33:23

我只是做了一些简单的测试...有疑问给我发消息把.

使用方法

//获取选择的图形 并且保存出来

  1. private void button2_Click(object sender, EventArgs e)
  2.         {
  3.             IListMemoryStream> _List = gifRichTextBox1.LoadSelectFile();

  5.             for (int i = 0; i != _List.Count; i++)
  6.             {
  7.                 File.WriteAllBytes(@"C:\Temp\A" + i.ToString() + ".gif", _List[0].ToArray());
  8.             }
  9.         }

  11. //添加一个GIF图形
  12.         private void button3_Click(object sender, EventArgs e)
  13.         {
  14.             gifRichTextBox1.AddFile(@"C:\Temp\0.gif");
  15.         }

  17. //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.
  18.         string _Text = "";
  19.         private void button1_Click(object sender, EventArgs e)
  20.         {
  21.             _Text = gifRichTextBox1.Rtf;


  24.         }

  26. //重新显示RTF内容

  28.         private void button4_Click(object sender, EventArgs e)
  29.         {
  30.             gifRichTextBox1.Rtf = _Text;
  31.         }

  33. 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..

  35. 下面是全部的类

  37. using System;
  38. using System.Collections.Generic;
  39. using System.Text;
  40. using System.IO;
  41. using System.Windows.Forms;
  42. using System.Drawing;

  44. namespace Zgke.WindowFrom.Window.Controls.UserControls
  45. {
  46.     ///
  47.     /// RichTextBox支持 GIF图形
  48.     /// zgke@sina.com
  49.     /// qq:116149
  50.     ///
  51.     public class GifRichTextBox : RichTextBox
  52.     {
  53.         public GifRichTextBox()
  54.         {
  55.           
  56.         }

  58.         ///
  59.         /// 重绘
  60.         ///
  61.         ///
  62.         protected override void WndProc(ref Message m)
  63.         {
  64.             if (m.Msg == 0xF)
  65.             {
  66.                 foreach (Control _SubControl in base.Controls)
  67.                 {
  68.                     _SubControl.Tag = "1";
  69.                 }

  71.                 GetRichTextObjRectangle();

  73.                 for (int i = 0; i != base.Controls.Count; i++)
  74.                 {
  75.                     if (base.Controls[i].Tag.ToString() == "1")
  76.                     {
  77.                         base.Controls.RemoveAt(i);
  78.                         i--;
  79.                     }
  80.                 }
  81.             }
  82.             base.WndProc(ref m);
  83.         }

  85.         ///
  86.         /// 添加一个文件资源到RTF数据
  87.         ///
  88.         /// 文件路径
  89.         public void AddFile(string p_FileFullPath)
  90.         {
  91.             byte[] _FileBytes = File.ReadAllBytes(p_FileFullPath);
  92.             Image _Image = Image.FromStream(new MemoryStream(_FileBytes));
  93.             string _Guid = BitConverter.ToString(Guid.NewGuid().ToByteArray()).Replace("-", "");
  94.             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}");
  95.             int _Width = _Image.Width * 15;
  96.             int _Height = _Image.Height * 15;
  97.             _RtfText.Append(@"\objw" + _Width.ToString() + @"\objh" + _Height.ToString());
  98.             _RtfText.AppendLine(@"{\*\objdata");
  99.             _RtfText.AppendLine(@"010500000200000007000000504272757368000000000000000000" + BitConverter.ToString(BitConverter.GetBytes(_FileBytes.Length + 20)).Replace("-", ""));
  100.             _RtfText.Append("7A676B65" + _Guid); //标记
  101.             _RtfText.AppendLine(BitConverter.ToString(_FileBytes).Replace("-", ""));
  102.             _RtfText.AppendLine(@"0105000000000000}{\result{\pict\wmetafile0}}}}");
  103.             base.SelectedRtf = _RtfText.ToString();
  104.         }

  106.         ///
  107.         /// 获取选择的文件
  108.         ///
  109.         /// 文件列表
  110.         public IListMemoryStream> LoadSelectFile()
  111.         {
  112.             IListMemoryStream> _FileList = new ListMemoryStream>();
  113.             int _Index = base.SelectedRtf.IndexOf(@"{\*\objdata");
  114.             if (_Index == -1) return _FileList;

  116.             while (_Index != -1)
  117.             {
  118.                 MemoryStream _File = new MemoryStream();
  119.                 _Index += 80;
  120.                 string _LengthText = base.SelectedRtf.Substring(_Index, 8);

  122.                 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);
  123.                 _Index += 10;

  125.                 string _Head = base.SelectedRtf.Substring(_Index, 8);
  126.                 if (_Head.ToUpper() == "7A676B65")
  127.                 {
  128.                     _Index += 40;
  129.                     _Length -= 20;
  130.                     int _EndIndex = base.SelectedRtf.IndexOf("01050000", _Index);
  131.                     int _ReadIndex = 0;
  132.                     _FileList.Add(LoadMemoryStream(base.SelectedRtf.Substring(_Index, _EndIndex - _Index), ref _ReadIndex, _Length));
  133.                     _Index = _EndIndex;
  134.                 }
  135.                 _Index = base.SelectedRtf.IndexOf(@"{\*\objdata", _Index);
  136.             }
  137.             return _FileList;
  138.         }

  140.         ///
  141.         /// 获取图形或则改动PictureBox的位置
  142.         ///
  143.         ///
  144.         private void PointFile(string p_Rtf, Point p_StarPoint, int p_Width, int p_Height)
  145.         {
  146.             int _Index = p_Rtf.IndexOf(@"{\*\objdata");
  147.             if (_Index == -1) return;
  148.             _Index += 80;
  149.             string _LengthText = p_Rtf.Substring(_Index, 8);

  151.             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);
  152.             _Index += 10;

  154.             string _Head = p_Rtf.Substring(_Index, 8);
  155.             if (_Head.ToUpper() != "7A676B65") return; //如果不是标记出来的 就不生成PictureBox
  156.             _Index += 8;

  158.             string _Guid = p_Rtf.Substring(_Index, 32);

  160.             Control _Controls = base.Controls[_Guid];
  161.             if (_Controls == null)
  162.             {
  163.                 PictureBox _PictureBox = new PictureBox();
  164.                 _PictureBox.Name = _Guid;
  165.                 _PictureBox.Tag = "0";
  166.                 _PictureBox.Location = p_StarPoint;
  167.                 _PictureBox.Size = new Size(p_Width, p_Height);

  169.                 _Index += 32;
  170.                 _Length -= 20;

  172.                 _PictureBox.Image = Image.FromStream(LoadMemoryStream(p_Rtf, ref _Index,_Length));

  174.                 base.Controls.Add(_PictureBox);
  175.             }
  176.             else
  177.             {
  178.                 _Controls.Location = p_StarPoint;
  179.                 _Controls.Size = new Size(p_Width, p_Height);
  180.                 _Controls.Tag = "0";
  181.             }
  182.         }

  184.         ///
  185.         /// 根据RTF保存的内容获取内存流
  186.         ///
  187.         /// RTF
  188.         /// 开始位置
  189.         /// 读取数量
  190.         /// 内存流
  191.         private MemoryStream LoadMemoryStream(string p_Text,ref int p_Index,int p_Count)
  192.         {
  193.             MemoryStream _File =new MemoryStream();
  194.             char[] _Text = p_Text.ToCharArray();
  195.             for (int i = 0; i != p_Count; i++)
  196.             {
  197.                 if (_Text[p_Index] == '\r' && _Text[p_Index + 1] == '\n')
  198.                 {
  199.                     i--;
  200.                 }
  201.                 else
  202.                 {
  203.                     _File.WriteByte(Convert.ToByte(_Text[p_Index].ToString() + _Text[p_Index + 1].ToString(), 16));
  204.                 }
  205.                 p_Index += 2;
  206.             }
  207.             return _File;
  208.         }
  209.        
  210.         ///
  211.         /// 获取RICHTEXTBOX所有图形的位置
  212.         ///
  213.         /// RICHTEXTBOX
  214.         /// 位置信息
  215.         private void GetRichTextObjRectangle()
  216.         {
  217.             RichTextBox _RichText = new RichTextBox();
  218.             _RichText.Rtf = base.Rtf;
  219.             int _Count = base.Text.Length;

  221.             for (int i = 0; i != _Count; i++)
  222.             {
  223.                 if (base.Text[i] == ' ')
  224.                 {
  225.                     _RichText.Select(i, 1);

  227.                     if (_RichText.SelectionType.ToString() == "Object")
  228.                     {
  229.                         Point _StarPoint = base.GetPositionFromCharIndex(i);

  231.                         System.Text.RegularExpressions.Regex _RegexWidth = new System.Text.RegularExpressions.Regex(@"(?);
  232.                         System.Text.RegularExpressions.Regex _RegexHeight = new System.Text.RegularExpressions.Regex(@"(?);

  234.                         int _Width = 0;
  235.                         int _Height = 0;

  237.                         if (int.TryParse(_RegexWidth.Match(_RichText.SelectedRtf).Value, out _Width) && int.TryParse(_RegexHeight.Match(_RichText.SelectedRtf).Value, out _Height))
  238.                         {
  239.                             _Width = _Width / 15;
  240.                             _Height = _Height / 15;
  241.                             PointFile(_RichText.SelectedRtf, _StarPoint, _Width, _Height);
  242.                         }
  243.                     }
  244.                 }
  245.             }
  246.             _RichText.Dispose();
  247.         }
  248.     }
  249. }

另加一个检测GIF文件是否被损坏的方法：

  1. class Utility
  2.     {

  4.         //Bonus. A simple check on the GIF files because some may contain "bad" data and crash the program.
  5.         public static bool IsImageCorrupted(Image img)
  6.         {
  7.             bool itis = false;

  9.             try
  10.             {
  11.                 if (!ImageAnimator.CanAnimate(img))
  12.                 {
  13.                     return itis;
  14.                 }
  15.                 int frames = img.GetFrameCount(System.Drawing.Imaging.FrameDimension.Time);
  16.                 if (frames = 1)
  17.                 {
  18.                     return itis;
  19.                 }
  20.                 byte[] times = img.GetPropertyItem(0x5100).Value;
  21.                 int frame = 0;
  22.                 for (; ; )
  23.                 {
  24.                     int dur = BitConverter.ToInt32(times, 4 * frame);
  25.                     if (++frame >= frames) break;
  26.                     img.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Time, frame);
  27.                 }

  29.             }
  30.             catch (Exception ex)
  31.             {
  32.                 throw ex;
  33.             }

  35.             return itis;
  36.         }
  37.     }

转载着修改自博客：
http://www.cnblogs.com/jxsoft/archive/2011/06/22/2087435.html
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