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c#中CAD文件读取介绍

本篇实例内容是关于C#读取CAD文件的,直接看代码
//在不使用任务插件的情况下读取DWG文件的缩略图,以便在没有安装AutoCAD的计算机上浏览。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
namespace 浏览dwg
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
ViewDWG viewDwg = new ViewDWG();
pictureBox1.Image = viewDwg.GetDwgImage("c:\\1.dwg");
}
class ViewDWG
{
struct BITMAPFILEHEADER
{
public short bfType;
public int bfSize;
public short bfReserved1;
public short bfReserved2;
public int bfOffBits;
}
public Image GetDwgImage(string FileName)
{
if (!(File.Exists(FileName)))
{
throw new FileNotFoundException("文件没有被找到");
}
FileStream DwgF; //文件流
int PosSentinel; //文件描述块的位置
BinaryReader br; //读取二进制文件
int TypePreview; //缩略图格式
int PosBMP;       //缩略图位置
int LenBMP;       //缩略图大小
short biBitCount; //缩略图比特深度
BITMAPFILEHEADER biH; //BMP文件头,DWG文件中不包含位图文件头,要自行加上去
byte[] BMPInfo;       //包含在DWG文件中的BMP文件体
MemoryStream BMPF = new MemoryStream(); //保存位图的内存文件流
BinaryWriter bmpr = new BinaryWriter(BMPF); //写二进制文件类
Image myImg = null;
try
{
DwgF = new FileStream(FileName, FileMode.Open, FileAccess.Read);   //文件流
br = new BinaryReader(DwgF);
DwgF.Seek(13, SeekOrigin.Begin); //从第十三字节开始读取
PosSentinel = br.ReadInt32(); //第13到17字节指示缩略图描述块的位置
DwgF.Seek(PosSentinel + 30, SeekOrigin.Begin); //将指针移到缩略图描述块的第31字节
TypePreview = br.ReadByte(); //第31字节为缩略图格式信息,2 为BMP格式,3为WMF格式
if (TypePreview == 1)
{
}
else if (TypePreview == 2 || TypePreview == 3)
{
PosBMP = br.ReadInt32(); //DWG文件保存的位图所在位置
LenBMP = br.ReadInt32(); //位图的大小
DwgF.Seek(PosBMP + 14, SeekOrigin.Begin); //移动指针到位图块
biBitCount = br.ReadInt16(); //读取比特深度
DwgF.Seek(PosBMP, SeekOrigin.Begin); //从位图块开始处读取全部位图内容备用
BMPInfo = br.ReadBytes(LenBMP); //不包含文件头的位图信息
br.Close();
DwgF.Close();
biH.bfType = 19778; //建立位图文件头
if (biBitCount
实例内容扩展:
C#中读取cad文件中的属性
using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
Database db = new Database(false, true);
try
{
//把DWG文件读入到一个临时的内存数据库中
db.ReadDwgFile(fullFileName, System.IO.FileShare.ReadWrite, true, null);
//现在进入数据库并获得数据库的块表引用
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead, false, true);
//从块表的模型空间特性中获得块表记录,块表记录对象包含DWG文件数据库实体
BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForRead, false, true);
foreach (ObjectId btrId in btr)
{
DBObject entBlock = (DBObject)trans.GetObject(btrId, OpenMode.ForRead, false, true);
if (entBlock.GetRXClass().DxfName.ToUpper() == “INSERT”)
{
BlockReference bRef = (BlockReference)entBlock;
if (bRef.AttributeCollection.Count != 0)
{
System.Collections.IEnumerator bRefEnum = bRef.AttributeCollection.GetEnumerator();
while (bRefEnum.MoveNext())
{
ObjectId aId = (ObjectId)bRefEnum.Current;//这一句极其关键
AttributeReference aRef = (AttributeReference)trans.GetObject(aId, OpenMode.ForRead, false, true);
aRef.TextString;//此语句即获得属性单行文本,请自行在此语句前添加 属性单行文本 赋于的变量
}
}
}
}
trans.Commit(); //提交事务处理
btr.Dispose();
bt.Dispose();
}
catch (System.Exception ex)
{
MessageBox.Show(“\n出错啦: ” + ex.Message);
}
finally
{
db.Dispose();
}

到此这篇关于c#中CAD文件读取实例的文章就介绍到这了

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