ObjectARX之“九表多词典”操作

CAD二次开发的技术多种多样，无论哪一种技术，其核心永远是对“九表多词典”的增删改查操作，这也是CAD二次开发实用最多的接口。

本文简要介绍基于ObjectARX的“九表多词典”操作，详细资料和接口信息可参考官方文档。

项目搭建

强烈建议使用ObjectARX的项目模板，后期涉及自定义实体等高级开发技术时，该项目模板可以提供很多帮助。

向模型空间添加图元

static void LHMyGroupMyCommand() {
    AcDbDatabase* pDB = acdbHostApplicationServices()->workingDatabase();
    AcDbBlockTable* pBlockTable;
    pDB->getSymbolTable(pBlockTable, AcDb::kForWrite);
    AcDbBlockTableRecord* pBlockTableRecord;
    pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
    AcDbLine* pLine = new AcDbLine(AcGePoint3d(0, 0, 0), AcGePoint3d(1000, 1000, 0));
    AcDbCircle* pCircle = new AcDbCircle(AcGePoint3d(0, 0, 0), AcGeVector3d(0, 0, 1), 500);
    AcDbArc* pArc = new AcDbArc(AcGePoint3d(100, 100, 0), 200, 90, 180);
    pBlockTableRecord->appendAcDbEntity(pLine);
    pBlockTableRecord->appendAcDbEntity(pCircle);
    pBlockTableRecord->appendAcDbEntity(pArc); 
    pLine->close();
    pCircle->close();
    pArc->close();
    pBlockTable->close();
    pBlockTableRecord->close();
}

新增块表记录

static void LHMyGroupMyCommand() {
    AcDbDatabase* pDB = acdbHostApplicationServices()->workingDatabase();
    // 创建新块并插入模型空间
    AcDbBlockTableRecord* newBlock = new AcDbBlockTableRecord();
    newBlock->setName(L"测试块定义");
    newBlock->setOrigin(AcGePoint3d(0, 0, 0));
    AcDbLine* pLine2 = new AcDbLine(AcGePoint3d(0, 0, 0), AcGePoint3d(1000, 1000, 0));
    AcDbCircle* pCircle2 = new AcDbCircle(AcGePoint3d(0, 0, 0), AcGeVector3d(0, 0, 1), 500);
    AcDbArc* pArc2 = new AcDbArc(AcGePoint3d(100, 100, 0), 200, 90, 180);
    newBlock->appendAcDbEntity(pLine2);
    newBlock->appendAcDbEntity(pCircle2);
    newBlock->appendAcDbEntity(pArc2);
    AcDbObjectId blockDefinitionId;
    pBlockTable->add(blockDefinitionId, newBlock);
    newBlock->close();
    pLine2->close();
    pCircle2->close();
    pArc2->close();
    // 向模型空间插入块参照
    AcDbBlockReference* reference = new AcDbBlockReference(AcGePoint3d(1000, 1000, 0), blockDefinitionId);
    pBlockTableRecord->appendAcDbEntity(reference);
    reference->close();
    pBlockTable->close();
    pBlockTableRecord->close();
}

新增图层

static void LHMyGroupMyCommand() {
    AcDbDatabase* pDB = acdbHostApplicationServices()->workingDatabase();
    AcDbLayerTable* pLayerTable;
    pDB->getSymbolTable(pLayerTable, AcDb::kForWrite);
    AcDbLayerTableRecord* newLayer = new AcDbLayerTableRecord();
    newLayer->setName(L"测试图层");
    AcCmColor color;
    color.setColorIndex(1);
    newLayer->setColor(color);
    pLayerTable->add(newLayer);
    pLayerTable->close();
    newLayer->close();
}

词典操作（创建新分组）

static void LHMyGroupMyCommand() {
    AcDbGroup* pGroup = new AcDbGroup(L"新组");
    AcDbDictionary* pGroupDict;
    acdbHostApplicationServices()->workingDatabase()
        ->getGroupDictionary(pGroupDict, AcDb::kForWrite);
    AcDbObjectId pGroupId;
    pGroupDict->setAt(L"新组", pGroup, pGroupId);
    pGroupDict->close();
    ads_name ss;
    acedSSGet(L"A", nullptr, nullptr, nullptr, ss);
    Adesk::Int32 len;
    acedSSLength(ss, &len);
    AcDbObjectId id;
    for (Adesk::Int32 i = 0; i < len; i++)
    {
        ads_name ent;
        acedSSName(ss, i, ent);
        acdbGetObjectId(id, ent);
        pGroup->append(id);
    }
    pGroup->close();
}