如何通过APS Design Automation API将标记导入DWG并保存？

核心思路 #

借助Design Automation for AutoCAD运行自定义脚本，将DXF标记文件导入目标DWG，再把合并后的DWG存回Forge存储桶。

具体步骤 #

1. 编写AutoCAD自定义脚本（.NET） #

核心是实现导入DXF到DWG的逻辑，示例代码如下：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Runtime;
using System.IO;

namespace MarkupMerger
{
    public class Commands
    {
        [CommandMethod("MergeMarkups")]
        public void MergeMarkups()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;

            // 读取输入的DXF标记文件（Design Automation中输入文件默认挂载路径）
            string dxfPath = Path.Combine(Environment.GetEnvironmentVariable("LOCALAPPDATA"), "Autodesk", "DesignAutomation", "Input", "markups.dxf");
            
            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                // 打开模型空间
                BlockTable bt = tr.GetObject(db.BlockTableId, OpenMode.ForRead) as BlockTable;
                BlockTableRecord btr = tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;

                // 导入DXF到模型空间
                using (DxfIn dxfIn = new DxfIn())
                {
                    dxfIn.DxfInFile(dxfPath, db, btr.Id);
                }

                tr.Commit();
            }

            // 保存合并后的DWG到输出目录
            doc.SaveAs(Path.Combine(Environment.GetEnvironmentVariable("LOCALAPPDATA"), "Autodesk", "DesignAutomation", "Output", "merged.dwg"), DwgVersion.Current);
        }
    }
}

2. 打包脚本为AppBundle #

将编译好的.NET程序集（.dll文件）打包成ZIP包，作为Design Automation的AppBundle上传。

3. 创建Design Automation活动 #

配置活动参数：

• 输入参数：原DWG文件（来自Forge存储桶）、DXF标记文件（来自Forge存储桶）
• 输出参数：合并后的DWG文件（存回Forge存储桶）
• 命令行：指定AutoCAD执行自定义命令，示例：/i "$(args[inputDWG].path)" /c "MergeMarkups"

4. 在.NET Core中触发工作项 #

通过Forge SDK发送工作项请求，指定输入输出文件的存储桶路径，示例代码片段：

var workItem = new WorkItem()
{
    ActivityId = "你的活动ID",
    Arguments = new Dictionary<string, IArgument>()
    {
        { "inputDWG", new XrefTreeArgument() { Url = "原DWG的存储桶URL", Headers = new Dictionary<string, string>() { { "Authorization", $"Bearer {accessToken}" } } } },
        { "markupDXF", new XrefTreeArgument() { Url = "DXF标记的存储桶URL", Headers = new Dictionary<string, string>() { { "Authorization", $"Bearer {accessToken}" } } } },
        { "outputDWG", new XrefTreeArgument() { Url = "输出DWG的存储桶URL", Headers = new Dictionary<string, string>() { { "Authorization", $"Bearer {accessToken}" } }, Verb = Verb.Put } }
    }
};

var workitemResponse = await designAutomationClient.CreateWorkItemAsync(workItem);

5. 轮询工作项状态 #

检查工作项状态，当状态变为Success时，合并后的DWG已成功保存到指定存储桶。

关键注意事项 #

• 确保DXF标记的坐标系统与原DWG一致，避免导入后位置偏移
• 选用与原DWG版本兼容的Design Automation AutoCAD引擎
• 配置好存储桶文件的读写权限，保证Design Automation能正常访问

内容的提问来源于stack exchange，提问作者Plarent Haxhidauti