使用.NET开发AutoCAD——C#/AutoCAD 2018/ObjectArx/二次开发入门（二）

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 。