CAD二次开发 on 软件开发大郭的技术博客

【CAD插件开发】批量修改图纸中在文字(C++)

Thu, 13 Feb 2025 06:43:03 +0800

void ChangeTextInDrawing() {
    AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();
    AcDbBlockTable* pBlockTable;
    pDb->getSymbolTable(pBlockTable, AcDb::kForRead);
    AcDbBlockTableRecord* pModelSpace;
    pBlockTable->getAt(ACDB_MODEL_SPACE, pModelSpace, AcDb::kForRead);
 
    AcDbObjectIdArray entityIds;
    pModelSpace->getIDsOfClass(AcDb::kMText, entityIds);
    
    for (auto& id : entityIds) {
        AcDbEntity* pEntity;
        pDb->openObject(pEntity, id, AcDb::kForRead);
        if (pEntity->isKindOf(AcDbMText::desc())) {
            AcDbMText* pText = AcDbMText::cast(pEntity);
            const char* text = pText->textString();
            if (text) {
                std::string newText = std::string(text).replace(0, 5, "NEW"); // 示例：将前5个字符替换为"NEW"
                pText->setTextString(newText.c_str());
            }
            pText->downgradeOpen(); // 降级对象以关闭它，但不保存到数据库中
        }
        pEntity->close(); // 关闭实体对象
    }
    pModelSpace->close();
    pBlockTable->close();
}

【CAD二次开发】批量修改图纸日期和做着（C++）

Thu, 13 Feb 2025 06:39:11 +0800

C++进行二次开发来批量修改图纸中的日期和作者信息

#include "aced.h"
#include "dbents.h"
#include "dbdictionary.h"
#include "dbdict.h"
#include "dbxutil.h"
#include "adscodes.h"
 
void updateDrawingInfo(const char* newDate, const char* newAuthor) {
    AcDbDatabase* pDb = acdbHost()->workingDatabase();
    AcDbDictionary* pDict = NULL;
    if (AcDbDictionary::cast(pDb->getNamedObjectsDictionary(), pDict) == Acad::eOk) {
        AcDbDictionaryEntryIterator* iter = NULL;
        if (pDict->getEntryIterator(iter) == Acad::eOk) {
            for (; !iter->done(); iter->next()) {
                AcRxClass* pClass = iter->objectClass();
                if (pClass == AcDbBlockTableRecord::desc()) {
                    AcDbBlockTableRecord* pRecord = AcDbBlockTableRecord::cast(iter->object());
                    if (pRecord && pRecord->isLayout()) { // 只修改布局的属性
                        pRecord->setXData(kDwgStampAppName, kDwgStampDate, newDate);
                        pRecord->setXData(kDwgStampAppName, kDwgStampAuthor, newAuthor);
                    }
                }
            }
            delete iter;
        }
    }
}

【CAD二次开发】C++读取图纸信息

Thu, 13 Feb 2025 06:24:09 +0800

在CAD二次开发中，使用C++读取图纸信息是一个常见的需求。这通常涉及到使用AutoCAD的API，例如ObjectARX或AutoCAD .NET API。

【CAD插件开发】读取外面块和图层

Thu, 13 Feb 2025 06:15:35 +0800

[CommandMethod("GetLayerPro")]
public static void GetLayerPro()
{
    Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
    //新建一个数据库对象以读取Dwg文件          
    Database db = new Database(false, true);
    string fileName = "C:\\Drawing3.dwg";
    //如果指定文件名的文件存在          
    if(System.IO.File.Exists(fileName))
    {
        //把文件读入到数据库中          
        db.ReadDwgFile(fileName, System.IO.FileShare.Read, true, null);
        using(Transaction trans = db.TransactionManager.StartTransaction())
        {
            //获取数据库的图层表对象      
            LayerTable lt = (LayerTable) trans.GetObject(db.LayerTableId, OpenMode.ForRead);
            //循环遍历每个图层                   
            foreach(ObjectId layerId in lt)
            {
                LayerTableRecord ltr = (LayerTableRecord) trans.GetObject(layerId, OpenMode.ForRead);
                if(ltr != null)
                {
                    Autodesk.AutoCAD.Colors.Color layerColor = ltr.Color;
                    ed.WriteMessage("\n图层名称为：" + ltr.Name);
                    ed.WriteMessage("\n图层颜色为：" + layerColor.ToString());
                }
            }
            trans.Commit();
        }
    }
}


[CommandMethod("GetEntitiesFromLayer")]
public static void GetEntitiesFromLayer(string layerName)
{
    Database db = HostApplicationServices.WorkingDatabase;
    Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
    using(Transaction trans = db.TransactionManager.StartTransaction())
    {
        LayerTable lt = (LayerTable) trans.GetObject(db.LayerTableId, OpenMode.ForRead);
        if(lt.Has(layerName))
        {
            BlockTableRecord ltr = (BlockTableRecord) trans.GetObject(db.CurrentSpaceId, OpenMode.ForRead);
            foreach(ObjectId objId in ltr)
            {
                Entity ent = (Entity) trans.GetObject(objId, OpenMode.ForRead);
                // 假设该图层中有一个圆       
                Circle myCircle = (Circle) ent;
                if(ent.Layer == layerName && myCircle != null)
                {
                    Point3d cirCenter = myCircle.Center;
                    ed.WriteMessage("\n圆心为：" + cirCenter.ToString());
                }
            }
        }
        trans.Commit();
    }
}