1、cad二开的准备工作

cad二次开发的sdk（官方的sdk下载地址，其中包含样例）：AutoCAD ObjectARX SDK Platform Technologies | Autodesk Developer Networkhttps://www.autodesk.com/developer-network/platform-technologies/autocad/objectarx

cad的lookup工具

安装在：C:\Program Files\Autodesk\ApplicationPlugins

2、cad与命令行的交互代码

//
//
//
//  Copyright 2019 Autodesk, Inc.  All rights reserved.
//
//  Use of this software is subject to the terms of the Autodesk license
//  agreement provided at the time of installation or download, or which
//  otherwise accompanies this software in either electronic or hard copy form.
//
//using System;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.EditorInput;[assembly: ExtensionApplication(null)]
[assembly: CommandClass(typeof(Prompts.PromptsTest))]namespace Prompts
{public class PromptsTest{static PromptAngleOptions useThisAngleOption;static PromptDoubleResult useThisAngleResult;static PromptPointOptions useThisPointOption;static PromptPointResult useThisPointResult;static PromptEntityOptions useThisEntityOption;static PromptEntityResult useThisEntityResult;//A small function that shows how to prompt for an integer[CommandMethod("GetInteger")] public void integerTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptIntegerOptions opt0 = new PromptIntegerOptions("Enter your age");opt0.AllowNegative = false;opt0.AllowNone = false;opt0.AllowZero = false;opt0.DefaultValue = 1;PromptIntegerResult IntRes = ed.GetInteger(opt0);if(IntRes.Status == PromptStatus.OK){ed.WriteMessage(string.Format("\nYou entered {0}",IntRes.Value));}}//This method prompts for a double value.//Pi,Two-pi  are valid keywords that can be entered//by the user at the prompt.[CommandMethod("GetDouble")] public void DoubleTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptDoubleOptions opt1 = new PromptDoubleOptions("Enter a number or Pi/Two-pi");opt1.Keywords.Add("Pi");opt1.Keywords.Add("Two-pi");opt1.AllowNone = false;opt1.AllowZero = false;opt1.DefaultValue = 1.0;PromptDoubleResult doubleRes = ed.GetDouble(opt1);if(doubleRes.Status == PromptStatus.Keyword){switch (doubleRes.StringResult){case "Pi":ed.WriteMessage("Value is 3.14");break;case "Two-pi":ed.WriteMessage("\nValue is 6.28");break;default:ed.WriteMessage("\nKeyword unknown");break;}}if(doubleRes.Status != PromptStatus.OK){ed.WriteMessage("\nUser entered: " + doubleRes.Status.ToString());}}//Gets the radius of the circle from the user using GetDistance command//and draw the circle.//The user can either specify the number in the command prompt or//The user can set the distance (in this case radius of circle) also//by specifying two locations on the graphics screen.//AutoCAD draws a rubber-band line from the first point to//the current crosshair position to help the user visualize the distance.[CommandMethod("GetDistance")] public void DistanceTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptDistanceOptions opt1 = new PromptDistanceOptions("Enter the radius of the circle");opt1.AllowNegative = false;opt1.AllowZero = false;opt1.AllowNone = false;opt1.UseDashedLine = true;PromptDoubleResult res = ed.GetDistance(opt1);if(res.Status == PromptStatus.OK){Point3d center = new Point3d(9.0, 3.0, 0.0);Vector3d normal = new Vector3d(0.0, 0.0, 1.0);Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){BlockTable bt = (BlockTable)tm.GetObject(db.BlockTableId, OpenMode.ForRead, false);BlockTableRecord btr = (BlockTableRecord)tm.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite, false);using (Circle pcirc = new Circle(center, normal, res.Value)){btr.AppendEntity(pcirc);tm.AddNewlyCreatedDBObject(pcirc, true);}myT.Commit();}}}//The user is prompted to enter the start angle and end angle at the//command prompt.  Using which an arc is created.//Not only by entering the values but The user can set the angle also by //specifying two 2D locations on the graphics screen. AutoCAD draws a//rubber-band line from the first point to the current crosshair position //to help the user visualize the angle.//Also attached to this function is the input context reactor event//PromptingForAngle and PromptedForAngle. During ed.GetAngle(), these//events gets fired. The call back function just remembers the prompt option//that the user has set initially and also the prompt result that the//user sees after he calls GetAngle() method.[CommandMethod("GetAngle")] public void AngleTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptAngleOptions opt1 = new PromptAngleOptions("Enter start angle of the arc");opt1.AllowNone = false;opt1.UseDashedLine = true;//USAGE OF INPUT CONTEXT REACTORSed.PromptingForAngle += new PromptAngleOptionsEventHandler(handle_promptangleOptions);ed.PromptedForAngle += new PromptDoubleResultEventHandler(handle_promptAngleResult);PromptDoubleResult startAngle = ed.GetAngle(opt1);ed.PromptingForAngle -= new PromptAngleOptionsEventHandler(handle_promptangleOptions);ed.PromptedForAngle -= new PromptDoubleResultEventHandler(handle_promptAngleResult);opt1.Message = "Enter end angle of the arc";PromptDoubleResult endAngle = ed.GetAngle(opt1);PromptDoubleOptions opt2 = new PromptDoubleOptions("Enter the radius of the arc(double)");opt2.Message = "Enter the radius of the arc(double)";PromptDoubleResult radius = ed.GetDouble(opt2);if(startAngle.Status == PromptStatus.OK && endAngle.Status == PromptStatus.OK && radius.Status == PromptStatus.OK){Point3d center = new Point3d(30.0, 19.0, 0.0);Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){BlockTable bt = (BlockTable)tm.GetObject(db.BlockTableId, OpenMode.ForRead, false);BlockTableRecord btr = (BlockTableRecord)tm.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite, false);using (Arc arc1 = new Arc(center, radius.Value, startAngle.Value, endAngle.Value)){btr.AppendEntity(arc1);tm.AddNewlyCreatedDBObject(arc1, true);}myT.Commit();}}else{ed.WriteMessage("Arc cannot be constructed");}}[CommandMethod("useAngle")] public void UsingAngleOptionsAndResults(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;//Verify GetAngle has been ran once before executing this oneif ( useThisAngleOption == null || useThisAngleResult == null ){ed.WriteMessage("Please run GetAngle command first");return;}//Using the stored PromptAngleOption.PromptDoubleResult res1 = ed.GetAngle(useThisAngleOption);//Using the stored PromptAngleResult.PromptDoubleResult res2 = useThisAngleResult;if(res1.Status == PromptStatus.OK && res2.Status == PromptStatus.OK){Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){             BlockTable bt = (BlockTable)tm.GetObject(db.BlockTableId,OpenMode.ForRead,false);BlockTableRecord btr = (BlockTableRecord)tm.GetObject(bt[BlockTableRecord.ModelSpace],OpenMode.ForWrite,false);Point3d center = new Point3d(30.0, 19.0, 0.0);using (Arc arc1 = new Arc(center, res1.Value, res2.Value, 5.0)){arc1.ColorIndex = 3;btr.AppendEntity(arc1);myT.AddNewlyCreatedDBObject(arc1, true);}myT.Commit();}}else{ed.WriteMessage("Arc cannot be constructed");}}//      Drawing a line using the points entered by the user.
//      Prompt the user for the start point and end point of the line.//        The AutoCAD user can specify the point by entering a coordinate in
//      the current units format; The user can specify the point also by specifying
//      a location on the graphics screen.[CommandMethod("GetPoint")] public void PointTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptPointOptions ptopts = new PromptPointOptions("Enter start point of the line");ptopts.BasePoint = new Point3d(1,1,1);ptopts.UseDashedLine = true;ptopts.Message = "Enter start point of the line";ed.PromptingForPoint += new PromptPointOptionsEventHandler(handle_promptPointOptions);ed.PromptedForPoint += new PromptPointResultEventHandler(handle_promptPointResult);PromptPointResult ptRes = ed.GetPoint(ptopts);ed.PromptingForPoint -= new PromptPointOptionsEventHandler(handle_promptPointOptions);ed.PromptedForPoint -= new PromptPointResultEventHandler(handle_promptPointResult);Point3d start = ptRes.Value;if(ptRes.Status == PromptStatus.Cancel){ed.WriteMessage("Taking (0,0,0) as the start point");}ptopts.Message ="Enter end point of the line: ";ptRes = ed.GetPoint(ptopts);Point3d end = ptRes.Value;if(ptRes.Status == PromptStatus.Cancel){ed.WriteMessage("Taking (0,0,0) as the end point");}Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){   BlockTable bt = (BlockTable)tm.GetObject(db.BlockTableId,OpenMode.ForRead,false);BlockTableRecord btr = (BlockTableRecord)tm.GetObject(bt[BlockTableRecord.ModelSpace],OpenMode.ForWrite,false);using (Line myline = new Line(start, end)){btr.AppendEntity(myline);tm.AddNewlyCreatedDBObject(myline, true);}myT.Commit();}}[CommandMethod("usepoint")] public void UsingPointOptionsAndResults(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;//Verify GetPoint has been ran once before executing this oneif ( useThisPointOption == null || useThisPointResult == null ){ed.WriteMessage("Please run GetPoint command first");return ;}//Using the stored PromptPointOption.PromptPointResult res1 = ed.GetPoint(useThisPointOption);//Using the stored PromptPointResult.PromptPointResult res2 = useThisPointResult;if(res1.Status != PromptStatus.Cancel && res2.Status != PromptStatus.Cancel){Point3d start = res1.Value;Point3d end = res2.Value;Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){             BlockTable bt = (BlockTable)tm.GetObject(db.BlockTableId,OpenMode.ForRead,false);BlockTableRecord btr = (BlockTableRecord)tm.GetObject(bt[BlockTableRecord.ModelSpace],OpenMode.ForWrite,false);using (Line myline = new Line(start, end)){myline.ColorIndex = 3;btr.AppendEntity(myline);myT.AddNewlyCreatedDBObject(myline, true);}myT.Commit();}}}//Here the user is prompted for a string that could be used as a keyword.//We then test to see if the user entered string has been taken as a valid //keyword or not by asking the user to enter that string as a keyword in the//command prompt. If it is not a valid one then the user is prompted for a //different value (which is a bug).[CommandMethod("GetKW")] public void KWandStringTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptStringOptions stropts = new PromptStringOptions("Enter a string you want to use as keyword");PromptKeywordOptions kwopts = new PromptKeywordOptions("Enter a string you want to use as keyword");stropts.AllowSpaces = false;PromptResult str = ed.GetString(stropts);kwopts.Keywords.Add(str.StringResult);kwopts.Keywords.Add("onemore");kwopts.Message = "Enter the word that u just enterd to test if its a valid keyword or not";PromptResult kw = ed.GetKeywords(kwopts);if(kw.Status == PromptStatus.OK){ed.WriteMessage("You entered a valid keyword");}else{ed.WriteMessage("You didn't enter a valid keyword: "+kw.Status.ToString());}}//Try to draw a few entities in the drawing for the user to select.//It prompts the user to select some entities and finally types//the name of the selected entity at the command prompt.//Also added the two input context reactor events://PromptingForEntity and PromptedForEntity[CommandMethod("Getentity")] public void EntityTest(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptEntityOptions entopts = new PromptEntityOptions("Pick an entity of your choice from the drawing");entopts.Message = "Pick an entity of your choice from the drawing";PromptEntityResult ent=null;//ADDED INPUT CONTEXT REACTOR  ed.PromptingForEntity += new PromptEntityOptionsEventHandler(handle_promptEntityOptions);ed.PromptedForEntity += new PromptEntityResultEventHandler(handle_promptEntityResult);try{ent = ed.GetEntity(entopts);}catch{ed.WriteMessage("You did not select a valid entity");ed.PromptingForEntity -= new PromptEntityOptionsEventHandler(handle_promptEntityOptions);ed.PromptedForEntity -= new PromptEntityResultEventHandler(handle_promptEntityResult);}ed.PromptingForEntity -= new PromptEntityOptionsEventHandler(handle_promptEntityOptions);ed.PromptedForEntity -= new PromptEntityResultEventHandler(handle_promptEntityResult);if(ent.Status != PromptStatus.Error){ObjectId entid = ent.ObjectId;Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){             Entity entity = (Entity)tm.GetObject(entid,OpenMode.ForRead,true);ed.WriteMessage("You selected: "+entity.GetType().FullName);myT.Commit();}}}//This method just makes use of the entity option and entity result//that was stored in a static variable when the PromptingForEntity//and PromptingForEntity events where fired from EntityTest() function.[CommandMethod("useentity")] public void UsingEntityOptionsAndResults(){Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;//Using the stored PromptEntityOption.PromptEntityResult res1 = ed.GetEntity(useThisEntityOption);//Using the stored PromptEntityResult.PromptEntityResult res2 = useThisEntityResult;ed.WriteMessage("\nCHANGING THE ALREADY SELECTED ENTITIES COLORS TO GREEN");if(res2.Status != PromptStatus.Error){ObjectId entid = res2.ObjectId;Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;ObjectId nowSelEntid = res1.ObjectId;using (Transaction myT = tm.StartTransaction()){             Entity Oldentity = (Entity)tm.GetObject(entid,OpenMode.ForWrite,true);Oldentity.ColorIndex = 2;ed.WriteMessage("\nYou Now selected: "+Oldentity.GetType().FullName);myT.Commit();}}}//Try to draw a few nested entities like blocks and xrefs in the drawing for the user to select.//if the user selects a nested entity then the name of the nested entity is displayed.//Finally after the user is done selecting the entities, a non interactive selection is made//at the point 30.4,11.6,0 and the name of the nested entity if any is displayed.[CommandMethod("GetNestentity")] public void NestedEntityTest(){ObjectIdCollection coll = new ObjectIdCollection();Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;PromptNestedEntityOptions entopts = new PromptNestedEntityOptions("prompt nested entity");entopts.AllowNone = true;entopts.Keywords.Add("Done");PromptNestedEntityResult ent= null;Database db = Application.DocumentManager.MdiActiveDocument.Database;Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = db.TransactionManager;using (Transaction myT = tm.StartTransaction()){     while(true){entopts.Message = "\nPick an entity of your choice from the drawing or type Done";try{ent = ed.GetNestedEntity(entopts);}catch{ed.WriteMessage("\nYou did not select a valid nested entity");break;}if(ent.Status == PromptStatus.Keyword){if(ent.StringResult.Equals("Done"))break;}try{if(ent.GetContainers().Length > 0){Entity entity;foreach(ObjectId oid in ent.GetContainers()){entity = (Entity)tm.GetObject(oid,OpenMode.ForRead,true);ed.WriteMessage("You selected: "+entity.GetType().FullName);}break;}else{ed.WriteMessage("You did not select any nested entity");}}catch{ed.WriteMessage("You are Done or did not select any nested entity");myT.Commit();return;}}entopts.NonInteractivePickPoint = new Point3d(30.4,11.6,0);entopts.UseNonInteractivePickPoint = true;try{ent = ed.GetNestedEntity(entopts);if(ent.GetContainers().Length > 0){Entity entity;foreach(ObjectId oid in ent.GetContainers()){entity = (Entity)tm.GetObject(oid,OpenMode.ForRead,true);ed.WriteMessage(entity.GetType().FullName+" has been selected");}}else{ed.WriteMessage("No nested entity was selected");}}catch{ed.WriteMessage("\nNo entity was selected");}myT.Commit();}}private static void handle_promptEntityOptions(object sender, PromptEntityOptionsEventArgs e){useThisEntityOption = e.Options;}private static void handle_promptEntityResult(object sender, PromptEntityResultEventArgs e){useThisEntityResult = e.Result;}private static void handle_promptPointOptions(object sender, PromptPointOptionsEventArgs e){useThisPointOption = e.Options;}private static void handle_promptPointResult(object sender, PromptPointResultEventArgs e){useThisPointResult = e.Result;}private static void handle_promptangleOptions(object sender, PromptAngleOptionsEventArgs e){useThisAngleOption = e.Options;}private static void handle_promptAngleResult(object sender, PromptDoubleResultEventArgs e){useThisAngleResult = e.Result;}}
}

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cad二次开发——环境准备、命令行交互

1、cad二开的准备工作

2、cad与命令行的交互代码

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