创建和修改图层表记录

以下示例演示如何获取当前数据库的图层表并将其打开以进行写入。它创建一个新的图层表记录 （） 并设置图层的某些属性（名称、冻结属性、开/关、视口和锁定）。然后，它创建一个颜色类对象，并将图层的颜色设置为红色。AcDbLayerTableRecord

要设置图层的线型，本示例将打开线型表进行读取，并获取所需线型的线型记录的对象 ID（此处为“虚线”）。获得线型的对象 ID 后，将关闭线型表并为新图层表记录设置线型。此示例使用函数将图层表记录添加到图层表中。最后，它关闭图层表记录和图层表本身。add()

void
addLayer()
{
    AcDbLayerTable *pLayerTbl;
    acdbHostApplicationServices()->workingDatabase()
        ->getSymbolTable(pLayerTbl, AcDb::kForWrite);
    if (!pLayerTbl->has("ASDK_TESTLAYER")) {
        AcDbLayerTableRecord *pLayerTblRcd
            = new AcDbLayerTableRecord;
        pLayerTblRcd->setName("ASDK_TESTLAYER");
        pLayerTblRcd->setIsFrozen(0);// layer to THAWED
        pLayerTblRcd->setIsOff(0);   // layer to ON
        pLayerTblRcd->setVPDFLT(0);  // viewport default
        pLayerTblRcd->setIsLocked(0);// un-locked
        AcCmColor color;
        color.setColorIndex(1); // set color to red
        pLayerTblRcd->setColor(color);
        // For linetype, we need to provide the object ID of
        // the linetype record for the linetype we want to
        // use. First, we need to get the object ID.
        //
        AcDbLinetypeTable *pLinetypeTbl;
        AcDbObjectId ltId;
        acdbHostApplicationServices()->workingDatabase()
            ->getSymbolTable(pLinetypeTbl, AcDb::kForRead);
        if ((pLinetypeTbl->getAt("DASHED", ltId))
            != Acad::eOk)
        {
            acutPrintf("\nUnable to find DASHED"
                " linetype. Using CONTINUOUS");
            // CONTINUOUS is in every drawing, so use it.
            //
            pLinetypeTbl->getAt("CONTINUOUS", ltId);
        }
        pLinetypeTbl->close();
        pLayerTblRcd->setLinetypeObjectId(ltId);
        pLayerTbl->add(pLayerTblRcd);
        pLayerTblRcd->close();
        pLayerTbl->close();
    } else {
        pLayerTbl->close();
        acutPrintf("\nlayer already exists");
    }
}