1、开发环境配置:
（1）安装AutoCAD2018；
（2）安装VS2015；
（3）安装ObjectARX 2018类库；
（4）安装ObjectARX 2018 .NET开发向导(ObjectARXWizards.msi)。
2、利用向导新建一个ObjectARX项目：File>NEW>project,在项目名称输入yunyou.ke.qq.com,确定。
3、确定后弹出如下对话框：
4、确定后生成项目：
5 、向导自动添加两个类，一个继承IExtensionApplication接口，这个是dll的入口，cad会从这个类加载程序做一些初始化的操作；另外一个可以写自定义的一些cad命令。
6、添加COM库的应用。
7、在“myplugin”中补充如下的命名空间引用。
using Autodesk.AutoCAD.Windows;
using AutoCAD;//com库
8、myplugin.cs代码修改如下：
using System;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Windows;
using AutoCAD;//com库
// This line is not mandatory, but improves loading performances
[assembly: ExtensionApplication(typeof(yunyou.ke.qq.com_1.MyPlugin))]
namespace yunyou.ke.qq.com
{
// This class is instantiated by AutoCAD once and kept alive for the
// duration of the session. If you don't do any one time initialization
// then you should remove this class.
public class MyPlugin : IExtensionApplication
{
void IExtensionApplication.Initialize()
{
//加载dll的时候执行相关加载操作
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("\n加载 云幽学院 yunyou.ke.qq.com\n");
load();
}
void IExtensionApplication.Terminate()
{
//这个是推出时执行
Document doc = Application.DocumentManager.MdiActiveDocument;
doc.LockDocument(DocumentLockMode.NotLocked, "", "", false);
}
private void load()
{
//这里添加一个工具条，添加一个按钮绑定下面的MyCommand命令
//这个是通过com组件实现需要引用cad的两个com组件.
AcadMenuGroups menugroups = (AcadMenuGroups)Application.MenuGroups;
AcadToolbar toolbar = menugroups.Item().Toolbars.Add("云幽学院 yunyou.ke.qq.com");
AcadToolbarItem item = toolbar.AddToolbarButton(toolbar.Count, "MyCommand", "云幽学院MyCommand", "MyCommand\n");
item.SetBitmaps("16x16.bmp", "32x32.bmp");
toolbar.Dock(AcToolbarDockStatus.acToolbarDockTop);
}
}
}
7、Mycommand.cs
using System;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.EditorInput;
// This line is not mandatory, but improves loading performances
[assembly: CommandClass(typeof(yunyou.ke.qq.com_1.MyCommands))]
namespace yunyou.ke.qq.com_1
{
// This class is instantiated by AutoCAD for each document when
// a command is called by the user the first time in the context
// of a given document. In other words, non static data in this class
// is implicitly per-document!
public class MyCommands
{
// Modal Command with localized name
[CommandMethod("MyGroup", "MyCommand", "MyCommandLocal", CommandFlags.Modal)]//特性标识，标识这个是cad命令
public void Init()
{
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("云幽学院 yunyou.ke.qq.com\n");
}
}
}
10、调试，在项目属性中，设置调试->启动外部程序，指定cad的启动路径，指定工作目录为当前程序的生成目录，既可调试。这里每次调试后，都要在启动cad后，通过netload命令加载dll，避免复杂调试、用自己的程序启动AutoCAD 并加载自己开发应用程序等高级方法请见云幽学院的视频课程 yunyou.ke.qq.com 。