故事

首先是飞诗在问了一个问题:Acad2007的com包围盒无法正确获取文字的包围盒,问有没有其他方法?
但是他测试了lisp的获取是正确的,所以他想反射调用里面内置的,而他会反射,但是获取不到在参数传回返回值.

而edata解决了这个问题,然后我测试的时候发现net5桌面程序不能用:Marshal.GetActiveObject
真是一个问题接一个.....这可怎么呢?

虽然我在学net5的教学中知道了这个,但是它没有给我解决方案.

然后南胜提醒了我一下,有using Microsoft.VisualBasic.Interaction.CreateObject可以用.
为此我完成了之前没有完成的东西:com启动Acad

开干

写一个net5的控制台调用这个,当然了,你喜欢低版本也可以...

new ReflectionAcad().GetBoundingBox();

然后复制粘贴这个就好了,各种的com技术都蛮有意思的.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using System.Windows;
using Microsoft.VisualBasic;

namespace 测试_exe发送cad
{
    //http://www.cadgj.com/?p=297
    public partial class AcadComTool
    {
        [DllImport("ole32.dll", EntryPoint = "CreateBindCtx")]
        static extern int _CreateBindCtx(int reserved, out IBindCtx ppbc);

        /// <summary>
        /// 获取已经启动的CAD进程的com
        /// </summary>
        /// <param name="apps"></param>
        public static void GetActiveAcadCom(List<object> apps, string cadDisplayName)
        {
            _CreateBindCtx(0, out IBindCtx pbc);
            pbc.GetRunningObjectTable(out IRunningObjectTable pprot);

            pprot.EnumRunning(out IEnumMoniker ppenumMoniker);
            ppenumMoniker.Reset();
            IMoniker[] rgelt = new IMoniker[1];
            rgelt[0] = null;
            int rc = ppenumMoniker.Next(1, rgelt, IntPtr.Zero);
            while (rgelt[0] != null)
            {
                rgelt[0].GetDisplayName(pbc, null, out string ppszDisplayName);
#if DEBUG
                //不启动cad的时候运行一次,看看有什么GUID,然后再启动一个cad对比就知道了
                Debug.WriteLine(ppszDisplayName);
#endif
                if (ppszDisplayName == cadDisplayName)
                {
                    pprot.GetObject(rgelt[0], out object obj);
                    if (obj == null)
                    {
                        continue;
                    }
                    apps.Add(obj);
                }
                rgelt[0] = null;
                rc = ppenumMoniker.Next(1, rgelt, IntPtr.Zero);
            }
        }
    }


    public partial class ReflectionAcad
    {
        const string ProgID = "AutoCAD.Application";

        /// <summary>
        /// com方式启动cad
        /// </summary>
        /// <returns></returns>
        private object StartAcad()
        {
            object acAcadApp = null;
            //只能获取已经打开的Acad,如果不存在会触发异常,暂未处理

#if !NET50
            dynamic acAcadApp = Marshal.GetActiveObject(progID); 
#else
            //两种方法,都会启动一个新的Acad.
#if true2
            //**不阻塞启动**
            var path = @"C:\Program Files\Autodesk\AutoCAD 2021\acad.exe";
            path = @"C:\Program Files (x86)\AutoCAD 2008\acad.exe";
            int acadid = Interaction.Shell(path, AppWinStyle.NormalFocus); //正常大小启动 ,返回进程id
#else
            //**阻塞启动**                 
            // acAcadApp = Interaction.GetObject("", ProgID);
            acAcadApp = Interaction.CreateObject(ProgID);
#endif
#endif    
            //acAcadApp = Activator.CreateInstance(comObjectName);

            return acAcadApp;
        }

        /// <summary>
        /// 通过cad的com进行反射调用VBA函数获取包围盒
        /// </summary>
        public void GetBoundingBox()
        {
            //与指定 ProgID 关联的类型,即获取相应的Com对象       
            var comObjectName = Type.GetTypeFromProgID(ProgID);
            if (comObjectName == null)
            {
                MessageBox.Show($"本机不存在:{ProgID}");
                return;
            }

            List<object> apps = new();
            AcadComTool.GetActiveAcadCom(apps, "!{6AB55F46-2523-4701-A912-B226F46252BA}");
            if (apps.Count == 0)
            {
                // Acad没有启动,那就去启动它
                var acAcadApp2 = StartAcad();
                if (acAcadApp2 == null)
                {
                    MessageBox.Show($"无法打开程序:{ProgID}");
                    return;
                }
                apps.Add(acAcadApp2);
            }

            foreach (var acAcadApp in apps)
            {
#if true
                //参数
                object[] args = new object[1];
                //设置需要设置的参数值
                args[0] = true;
                //设置属性-可视,显示窗体
                comObjectName.InvokeMember("Visible", BindingFlags.SetProperty, null, acAcadApp, args);

                //获取属性
                object comAcDoc = comObjectName.InvokeMember("ActiveDocument", BindingFlags.GetProperty, null, acAcadApp, null);
                object comAcMsSpace = comObjectName.InvokeMember("ModelSpace", BindingFlags.GetProperty, null, comAcDoc, null);
                //调用VBA函数也就是com暴露的函数,画在"激活的文档"的"模型空间"然后输入画一条线的坐标数据.
                object[] lines = new object[] { new double[] { 100, 100, 0 }, new double[] { 300, 300, 0 } };
                object comAcLine = comObjectName.InvokeMember("AddLine", BindingFlags.InvokeMethod, null, comAcMsSpace, lines);

                //pts就是包围盒返回的点集
                object[] pts = new object[2] { null, null };

                //由于需要从参数中返回结果,所以需要设置 ParameterModifier 作用在 InvokeMember 上
                var paramMod = new ParameterModifier(2);
                paramMod[0] = true;//设置为true才能改写
                paramMod[1] = true;

                //求得这条线的包围盒,返回给pts.
                comObjectName.InvokeMember("GetBoundingBox",
                    BindingFlags.SuppressChangeType | BindingFlags.InvokeMethod,
                    null, comAcLine, pts, new ParameterModifier[] { paramMod }, null, null);

                //全屏显示
                comObjectName.InvokeMember("ZoomAll", BindingFlags.InvokeMethod, null, acAcadApp, null);
#else
                //c#4等效代码
                acAcadApp.ZoomAll();
                dynamic acAcadDoc = acAcadApp.ActiveDocument;
                if (acAcadDoc != null)
                {
                    //acAcadDoc.SendCommand("_.Line 100,100 300,300  ");
                    dynamic acMsSpace = acAcadDoc.ModelSpace;
                    double[] p1 = new double[3] { 100.0, 100.0, 0.0 };
                    double[] p2 = new double[3] { 300.0, 300.0, 0.0 };

                    dynamic acLine = acMsSpace.AddLine(p1, p2);
                    object ptMin = new object();
                    object ptMax = new object();
                    acLine.GetBoundingBox(out ptMin, out ptMax);
                    MessageBox.Show(ptMin.ToString() + "\n" + ptMax.ToString());
                }
#endif
                 

                var a = (double[])pts[0];
                var b = (double[])pts[1]; 
                Debug.WriteLine($"MinPoint={a[0]},{a[1]},{a[2]}");
                Debug.WriteLine($"MaxPoint={b[0]},{b[1]},{b[2]}");
            }
        }
    }
}

(完)

标签：Acad,object,comObjectName,using,new,net,null,com,acAcadApp
来源： https://www.cnblogs.com/JJBox/p/14588762.html