RichTextBox插图片
来源：互联网 发布：犀牛软件初学教程 编辑：程序博客网 时间：2024/04/30 22:22
using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Drawing.Imaging;using System.Runtime.InteropServices;using System.Collections.Specialized;using System.IO;namespace WindowsFormsApplication1{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { ContextAdder.InsertImage(richTextBox1, Image.FromFile(@"E:\pic\temp.png")); } public class ContextAdder { public const int EmfToWmfBitsFlagsDefault = 0x00000000, EmfToWmfBitsFlagsEmbedEmf = 0x00000001, EmfToWmfBitsFlagsIncludePlaceable = 0x00000002, EmfToWmfBitsFlagsNoXORClip = 0x00000004; [DllImport("gdiplus.dll")] public static extern uint GdipEmfToWmfBits(IntPtr _hEmf, uint _bufferSize, byte[] _buffer, int _mappingMode, int _flags); private struct RtfFontFamilyDef { public const string Unknown = @"\fnil"; public const string Roman = @"\froman"; public const string Swiss = @"\fswiss"; public const string Modern = @"\fmodern"; public const string Script = @"\fscript"; public const string Decor = @"\fdecor"; public const string Technical = @"\ftech"; public const string BiDirect = @"\fbidi"; } private const int MM_ISOTROPIC = 7; private const int MM_ANISOTROPIC = 8; private const int HMM_PER_INCH = 2540; private const int TWIPS_PER_INCH = 1440; private const string FF_UNKNOWN = "UNKNOWN"; private const string RTF_HEADER = @"{\rtf1\ansi\ansicpg1252\deff0\deflang1033"; private const string RTF_DOCUMENT_PRE = @"\viewkind4\uc1\pard\cf1\f0\fs20"; private const string RTF_DOCUMENT_POST = @"\cf0\fs17}"; private const string RTF_IMAGE_POST = @"}"; private static HybridDictionary rtfFontFamily; static ContextAdder() { rtfFontFamily = new HybridDictionary(); rtfFontFamily.Add(FontFamily.GenericMonospace.Name, RtfFontFamilyDef.Modern); rtfFontFamily.Add(FontFamily.GenericSansSerif.Name, RtfFontFamilyDef.Swiss); rtfFontFamily.Add(FontFamily.GenericSerif.Name, RtfFontFamilyDef.Roman); rtfFontFamily.Add(FF_UNKNOWN, RtfFontFamilyDef.Unknown); } private static string GetFontTable(Font _font) { StringBuilder _fontTable = new StringBuilder(); _fontTable.Append(@"{\fonttbl{\f0"); _fontTable.Append(@"\"); if (rtfFontFamily.Contains(_font.FontFamily.Name)) _fontTable.Append(rtfFontFamily[_font.FontFamily.Name]); else _fontTable.Append(rtfFontFamily[FF_UNKNOWN]); _fontTable.Append(@"\fcharset0 "); _fontTable.Append(_font.Name); _fontTable.Append(@";}}"); return _fontTable.ToString(); } /// <summary> /// 在RichTextBox当前光标处插入一副图像。 /// </summary> /// <param name="rtb">多格式文本框控件</param> /// <param name="image">插入的图像</param> public static void InsertImage(RichTextBox rtb, Image image) { StringBuilder _rtf = new StringBuilder(); _rtf.Append(RTF_HEADER); _rtf.Append(GetFontTable(rtb.Font)); _rtf.Append(GetImagePrefix(rtb, image)); _rtf.Append(GetRtfImage(rtb, image)); _rtf.Append(RTF_IMAGE_POST); rtb.SelectedRtf = _rtf.ToString(); } private static string GetImagePrefix(RichTextBox rtb, Image _image) { float xDpi; float yDpi; using (Graphics _graphics = rtb.CreateGraphics()) { xDpi = _graphics.DpiX; yDpi = _graphics.DpiY; } StringBuilder _rtf = new StringBuilder(); int picw = (int)Math.Round((_image.Width / xDpi) * HMM_PER_INCH); int pich = (int)Math.Round((_image.Height / yDpi) * HMM_PER_INCH); int picwgoal = (int)Math.Round((_image.Width / xDpi) * TWIPS_PER_INCH); int pichgoal = (int)Math.Round((_image.Height / yDpi) * TWIPS_PER_INCH); _rtf.Append(@"{\pict\wmetafile8"); _rtf.Append(@"\picw"); _rtf.Append(picw); _rtf.Append(@"\pich"); _rtf.Append(pich); _rtf.Append(@"\picwgoal"); _rtf.Append(picwgoal); _rtf.Append(@"\pichgoal"); _rtf.Append(pichgoal); _rtf.Append(" "); return _rtf.ToString(); } private static string GetRtfImage(RichTextBox rtb, Image _image) { StringBuilder _rtf = null; MemoryStream _stream = null; Graphics _graphics = null; Metafile _metaFile = null; IntPtr _hdc; try { _rtf = new StringBuilder(); _stream = new MemoryStream(); using (_graphics = rtb.CreateGraphics()) { _hdc = _graphics.GetHdc(); _metaFile = new Metafile(_stream, _hdc); _graphics.ReleaseHdc(_hdc); } using (_graphics = Graphics.FromImage(_metaFile)) { _graphics.DrawImage(_image, new Rectangle(0, 0, _image.Width, _image.Height)); } IntPtr _hEmf = _metaFile.GetHenhmetafile(); uint _bufferSize = GdipEmfToWmfBits(_hEmf, 0, null, MM_ANISOTROPIC, EmfToWmfBitsFlagsDefault); byte[] _buffer = new byte[_bufferSize]; uint _convertedSize = GdipEmfToWmfBits(_hEmf, _bufferSize, _buffer, MM_ANISOTROPIC, EmfToWmfBitsFlagsDefault); for (int i = 0; i < _buffer.Length; ++i) { _rtf.Append(String.Format("{0:X2}", _buffer[i])); } return _rtf.ToString(); } finally { if (_graphics != null) _graphics.Dispose(); if (_metaFile != null) _metaFile.Dispose(); if (_stream != null) _stream.Close(); } } } }}
