[ARX程序]：菜鸟请教一个弱弱的问题

gdc666

下面这段代码执行后为什么没有在模型空间显现出图形

void createDwg()
{
AcDbDatabase*pDb=new AcDbDatabase();
AcDbBlockTable*pBtbl;
pDb->getSymbolTable(pBtbl,AcDb::kForRead);
AcDbBlockTableRecord*pBtblRcd;
pBtbl->getAt(ACDB_MODEL_SPACE,pBtblRcd,AcDb::kForWrite);
pBtbl->close();
AcDbCircle*pCir1=new AcDbCircle(AcGePoint3d(200,200,0),
                           AcGeVector3d(0,0,1),50.0);
AcDbCircle*pCir2=new AcDbCircle(AcGePoint3d(400,200,0),
                           AcGeVector3d(0,0,1),50.0);
AcDbLine*pLine=new AcDbLine(AcGePoint3d(300,230,0),
                           AcGePoint3d(300,50,0));
pLine->setColorIndex(1);
AcDbPolyline*pPolyline=new AcDbPolyline(4);
AcGePoint2d pt;
pt.x=220;
pt.y=60;
pPolyline->addVertexAt(0,pt,0.0,-1.0,-1.0);
pt.x=250;
pt.y=30;
pPolyline->addVertexAt(1,pt,0.0,-1.0,-1.0);
pt.x=350;
pt.y=30;
pPolyline->addVertexAt(2,pt,0.0,-1.0,-1.0);
pt.x=380;
pt.y=60;
pPolyline->addVertexAt(3,pt,0.0,-1.0,-1.0);
pPolyline->setThickness(100);
pPolyline->setColorIndex(4);

pBtblRcd->appendAcDbEntity(pCir1);
pCir1->close();
pBtblRcd->appendAcDbEntity(pCir2);
    pCir2->close();
pBtblRcd->appendAcDbEntity(pLine);
pLine->close();
pBtblRcd->appendAcDbEntity(pPolyline);
pPolyline->close();//以上分别创建了两个园，一条线，一条多义线
           //下面想把它们存盘

    pDb->saveAs("face.dwg“）；
delete pDb;
}

小李飞刀

你少了这样的语句：
pBtblRcd->close();

pDb->saveAs("face.dwg“）；
delete pDb;

我想你是看的小江的书吧，在他的书上45页有的

binbin

pBtblRcd->close();

gdc666

我已经加了pBtblRcd->close();存盘没有问题但是就是在屏幕上看不见图形

小李飞刀

void createDwg()
{
AcDbDatabase*pDb=new AcDbDatabase();
AcDbBlockTable*pBtbl;
pDb->getSymbolTable(pBtbl,AcDb::kForRead);
AcDbBlockTableRecord*pBtblRcd;
pBtbl->getAt(ACDB_MODEL_SPACE,pBtblRcd,AcDb::kForWrite);
pBtbl->close();
AcDbCircle*pCir1=new AcDbCircle(AcGePoint3d(200,200,0),
AcGeVector3d(0,0,1),50.0);
AcDbCircle*pCir2=new AcDbCircle(AcGePoint3d(400,200,0),
AcGeVector3d(0,0,1),50.0);
AcDbLine*pLine=new AcDbLine(AcGePoint3d(300,230,0),
AcGePoint3d(300,50,0));
pLine->setColorIndex(1);
AcDbPolyline*pPolyline=new AcDbPolyline(4);
AcGePoint2d pt;
pt.x=220;
pt.y=60;
pPolyline->addVertexAt(0,pt,0.0,-1.0,-1.0);
pt.x=250;
pt.y=30;
pPolyline->addVertexAt(1,pt,0.0,-1.0,-1.0);
pt.x=350;
pt.y=30;
pPolyline->addVertexAt(2,pt,0.0,-1.0,-1.0);
pt.x=380;
pt.y=60;
pPolyline->addVertexAt(3,pt,0.0,-1.0,-1.0);
pPolyline->setThickness(100);
pPolyline->setColorIndex(4);

pBtblRcd->appendAcDbEntity(pCir1);
pCir1->close();
pBtblRcd->appendAcDbEntity(pCir2);
pCir2->close();
pBtblRcd->appendAcDbEntity(pLine);
pLine->close();
pBtblRcd->appendAcDbEntity(pPolyline);
pPolyline->close();//以上分别创建了两个园，一条线，一条多义线
//下面想把它们存盘
pBtblRcd->close();

pDb->saveAs("face.dwg");
delete pDb;
}

我编译过的，是对的

照猫画虎

打开这个face.dwg就看到了，你创建的实体不在当前的数据库中

gdc666

原来是这样，我菜啊

wang_tianyu

要使创建的实体能够显示出来，必须首先得到当前数据库的指针，通过这个指针得到块表指针，再将实体一块表记录AcDbTableRecord的形式加入块表。

kefengmao

路过，
偷师
谢谢

xb4270293

想要立马看到就不要AcDbDatabase*pDb=new AcDbDatabase();
指针指向当前数据库即可，不过，最后来一个Redraw重画。