SOS!各位大侠救救小弟，

buanhui

下面是把选中的实体从数据库中删除，但不成功，该如何实现，望各位大虾指点迷津，以解燃眉之急
        rc = acedEntSel("\nSelect target layer entity. ", ent, ptpoint);
        switch(rc)
        {
                case RTERROR :
                        acutPrintf("\nNothing selected!! ");
                           break;
                      case RTCAN :
                        acutPrintf("\nUser canceled. ");
                           break;

                case RTNORM :
                       
                acdbGetObjectId(obId,ent);
                acdbOpenObject(myobj,obId, AcDb::kForRead);
                myobj->erase(Adesk::kTrue);//此处的用法是否有错误，劳指点?
                acedRedraw(ent，1);//此处的用法是否有错误，劳指点?
                break;
        }

whyangdong

ads_name ent;
        ads_point ptpoint;
        int rc;
        AcDbObjectId obId;
        AcDbObject *myobj;
        AcApDocument* pDoc = acDocManager->curDocument();
    Acad::ErrorStatus es = acDocManager->lockDocument(pDoc);
    if (es != Acad::eOk)
        {
        acedAlert("Failed to lock the document!");
        return;
    }
       
rc=acedEntSel("\nSelect target layer entity. ", ent, ptpoint);
switch(rc)
{
case RTERROR :
acutPrintf("\nNothing selected!! ");
           break;
case RTCAN :
acutPrintf("\nUser canceled. ");
           break;

case RTNORM :
acdbGetObjectId(obId,ent);
acdbOpenObject(myobj,obId, AcDb::kForWrite);

myobj->erase(true);
myobj->close();

break;
}
acDocManager->unlockDocument(pDoc);

buanhui

多谢whyangdong大侠 您提供的例子我能实现删除实体，但有一些问题
我把原程序拿来，请大侠分析出错误的原因是什么
autoCAD报错是在第二次调用删除命令时和退出autoCAD时报错
/* ArxMain.cpp - Interface file of ObjectARX */

#include "MyEntity.h"
#include <aced.h>
#include <rxregsvc.h>
#include <dbapserv.h>                // for acdbHostApplicationServices macro
#include <dbsymtb.h>                // for AcDbBlockTable class
#include <geassign.h>                // for asDblArray
#include <adslib.h>
#include <gelnsg3d.h>
#include <dbents.h>
#include <acdocman.h>
#include <string.h>                        // test

void createTriangle(void)
{

        AcGePoint3d leftPnt3d, rightPnt3d,leftdPnt, rightdPnt,ptmy,point0,point1;
        ads_point pt,ptpoint;
        ads_real wallWd,layerHd;
        ads_name ent;
          AcDbObjectId obId,obId1;
          AcGePoint3dArray points;
        int rc;
        AcDbVoidPtrArray xplode;
        AcGeLineSeg3d thisline,otherline;
        MyEntity* pTriangle;
        AcDbObject *myobj;
    AcApDocument* pDoc = acDocManager->curDocument();
    Acad::ErrorStatus es = acDocManager->lockDocument(pDoc);
    if (es != Acad::eOk)
        {
        acedAlert("Failed to lock the document!");
        return;
    }


        acdbHostApplicationServices()->workingDatabase()->setElevation(1000);

        if(acedGetPoint(NULL, "开始画墙...左点: ", pt) != RTNORM)
                return;
        leftPnt3d = asPnt3d(pt);
        if(acedGetPoint(pt, "\n右点: ", pt) != RTNORM)
                return;
        rightPnt3d = asPnt3d(pt);
        if(acedGetReal("\n墙的宽度: ", &wallWd) != RTNORM)
                return;
        if(acedGetReal("\n墙的高度: ", &layerHd) != RTNORM)
                return;


    pTriangle = new AcDbEquiTriangle();
        pTriangle->set(leftPnt3d, rightPnt3d,wallWd,layerHd);
    pTriangle->getdownPoints( leftdPnt, rightdPnt);
       
        // 将新建实体(pTriangle)添加到图形数据库中
        AcDbBlockTable *pBlockTable;
        acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead);
        AcDbBlockTableRecord *pBlockTableRecord;
        pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
        pBlockTable->close();

        AcDbObjectId objectId;
        pBlockTableRecord->appendAcDbEntity(objectId, (AcDbEquiTriangle *)pTriangle);
        pBlockTableRecord->close();
        pTriangle->close();
        acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForWrite);
    acutPrintf("\nSelect target layer entity. ");


    rc=acedEntSel("\nSelect target layer entity. ", ent, ptpoint);
    switch(rc)
        {
          case RTERROR :
            acutPrintf("\nNothing selected!! ");
            break;
          case RTCAN :
            acutPrintf("\nUser canceled. ");
            break;

          case RTNORM :
            acdbGetObjectId(obId,ent);
            acdbOpenObject(myobj,obId, AcDb::kForWrite);

            myobj->erase(true);
            myobj->close();

            break;
        }
acDocManager->unlockDocument(pDoc);  
    return;
}

whyangdong

在执行删除命令前,你又一次打开当前模型空间块表指针而且没有关闭块表指针,这一步是多余的,去掉即可