[求助]：非常奇怪的选择集问题

RedCAD

我在ARX（非DBX）中定义了一个无基类的公共辅助类
其中有三个成员函数：
BOOL CGenericFun::GetXYpoint(AcGePoint3d mLasPt,AcGePoint3d& retPoint,int mBasStyle)

BOOL CGenericFun::GetNearEntity(AcGePoint3d mousePt, AcDbEntity* pEnt, int entStyle)
这个函数的目的给定一点，将它转化为屏幕坐标，然后求出矩形框的屏幕坐标点，最后再将屏幕坐标点转化为CAD的坐标pt1,pt2，进行求选择集，但就是无法得到选择集。可是这个类的其他两个函数均是能运用的。我是在AcEdJig的派生类中的sample函数中调用的。我的目的是在光标移动的时候，不断去建立选择集，以此来分析当前光标是否非常接近某一个实体，如果是，我试图想对该实体进行高亮度显示等一些操作。

void CGenericFun::AddToModeSpace(AcDbEntity *pObj, AcDbObjectId nID)

类定义：
#if !defined(AFX_GENERICFUN_H__8D1C3803_D20E_4CE4_AB8D_18E29DE51EDC__INCLUDED_)
#define AFX_GENERICFUN_H__8D1C3803_D20E_4CE4_AB8D_18E29DE51EDC__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif
#include "dbents.h"
#include "geassign.h"

class CGenericFun  
{
public:
        void AddToModeSpace(AcDbEntity* pObj,AcDbObjectId nID);
        BOOL GetNearEntity(AcGePoint3d mousePt,AcDbEntity* pEnt,int entStyle=0);
        BOOL GetXYpoint(AcGePoint3d mLasPt,AcGePoint3d& retPoint,int mBasStyle=0);
  CGenericFun();
  virtual ~CGenericFun();
};
#endif

类实现：
#include "stdafx.h"
#include "stdarx.h"
#include "resource.h"
#include "GenericFun.h"
#include <string.h>
#include "acedads.h"


#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

CGenericFun::CGenericFun()
{

}

CGenericFun::~CGenericFun()
{

}

BOOL CGenericFun::GetXYpoint(AcGePoint3d mLasPt,AcGePoint3d& retPoint,int mBasStyle)
{
  AcGePoint3d pt0,pt1,pt2;
  AcDbPoint* mPt;
  if(mBasStyle==0)
  {
    if(acedGetPoint(asDblArray(mLasPt),"\n输入参考原点:",asDblArray(pt0))!=RTNORM)return false;
    if(acedGetPoint(asDblArray(mLasPt),"\n输入第一定位点:",asDblArray(pt1))!=RTNORM)return false;
  }
  else
  {
    if(acedGetPoint(NULL,"\n输入参考原点:",asDblArray(pt0))!=RTNORM)return false;
    if(acedGetPoint(asDblArray(pt0),"\n输入第一定位点:",asDblArray(pt1))!=RTNORM)return false;
  }
  mPt=new AcDbPoint;
  mPt->setPosition(pt1);
  AcDbObjectId mId;
  AddToModeSpace(mPt,mId);
  if(mBasStyle==0)
  {
    if(acedGetPoint(asDblArray(mLasPt),"\n输入第二定位点:",asDblArray(pt2))!=RTNORM)return false;
  }
  else
  {
    if(acedGetPoint(asDblArray(pt0),"\n输入第二定位点:",asDblArray(pt2))!=RTNORM)return false;
  }
  retPoint=pt2;
  return true;  
}

BOOL CGenericFun::GetNearEntity(AcGePoint3d mousePt, AcDbEntity* pEnt, int entStyle)
{
  CPoint pt;
  HWND mHnd;
  CMDIFrameWnd *pFrm;
  pFrm=acedGetAcadFrame();
  pt.x=mousePt.x;
  pt.y=mousePt.y;
  mHnd=pFrm->GetActiveFrame()->m_hWnd;
  ClientToScreen(mHnd,&pt);
  struct resbuf rb;
  acedGetVar("cursorsize",&rb);
  rb.restype=RTSHORT;
  int mLen=rb.resval.rint;
  acedGetVar("screensize",&rb);
  rb.restype=RTPOINT;
  mLen=(int)(rb.resval.rpoint[0]*mLen/200);
  ads_point pt1,pt2;
  ads_name ssname;
  ads_name LineName;
  char sbuf[10];
  rb.restype=0;
  strcpy(sbuf,"LINE");
  rb.resval.rstring=sbuf;
  rb.rbnext=NULL;
  CPoint pt0;
  pt0.x=pt.x-mLen;
  pt0.y=pt.y-mLen;
  ScreenToClient(mHnd,&pt0);
  pt1[X]=pt0.x;
  pt1[Y]=pt0.y;
  pt0.x=pt.x+mLen;
  pt0.y=pt.y+mLen;
  ScreenToClient(mHnd,&pt0);
  pt2[X]=pt0.x;
  pt2[Y]=pt0.y;
  pt1[Z]=pt2[Z]=0.0;
  //以下函数调用就是不行，但编译完全没问题
  int ret=acedSSGet("C",pt1,pt2,NULL,ssname);//奇怪啊
  long i=0;
  acedSSLength(ssname,&i);
  acedSSName(ssname,0L,LineName);
  AcDbObjectId eId;
  acdbGetObjectId(eId,LineName);
  AcDbEntity* pLine;
  acdbOpenObject(pLine,eId,AcDb::kForWrite);
  pLine->setColorIndex(3);
  acedSSFree(ssname);
  return true;
}

void CGenericFun::AddToModeSpace(AcDbEntity *pObj, AcDbObjectId nID)
{
  AcDbBlockTable *pBlkTbl;
  acdbHostApplicationServices()->workingDatabase()
    ->getSymbolTable(pBlkTbl, AcDb::kForRead);
  AcDbBlockTableRecord *pBlkTblRcd;
  pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb::kForWrite);
  pBlkTbl->close();
  pBlkTblRcd->appendAcDbEntity(nID,pObj);
  pBlkTblRcd->close();
  pObj->close();
}

//一下是在AcEdJig的派生类中调用以上定义类中的成员函数
类定义：
#if !defined(AFX_DRAWANGLINE_H__150A114F_C470_4B24_97F8_451B4CF1B143__INCLUDED_)
#define AFX_DRAWANGLINE_H__150A114F_C470_4B24_97F8_451B4CF1B143__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "GenericFun.h"

class CDrawAngLine : public AcEdJig  
{
public:
        CDrawAngLine();
        virtual ~CDrawAngLine();
public:
  void doIt();
  virtual AcEdJig::DragStatus sampler();
  virtual Adesk::Boolean update();
  virtual AcDbEntity* entity()const;
       
public:
        AcDbLine* pLine;
        int mBasLine;
  AcGePoint3d mStrPt;
  AcGePoint3d mSecPt;
  AcGePoint3d mCurPt;
  CGenericFun* geFun;
};

#endif

类实现

CDrawAngLine::CDrawAngLine()
{
  
}

CDrawAngLine::~CDrawAngLine()
{

}

void CDrawAngLine::doIt()
{
  AcGePoint3d pt0(0,0,0);
  int ret;
  geFun=new CGenericFun;
  acedInitGet(RSG_NOZERO,"A");
  ret=acedGetPoint(NULL,"\n输入直线的起点 <输入A空格:相对点>",asDblArray(mStrPt));
  if(ret!=RTNORM)
  {
    if(ret==-5005)
    {
      geFun->GetXYpoint(pt0,mStrPt,1);
    }
    else
    {
      return;
    }
  }
  mBasLine=0;
  pLine=new AcDbLine;
  setDispPrompt("\n请确定基准线:");
  AcEdJig::DragStatus stat=this->drag();
  mBasLine=1;
  setDispPrompt("\n请输入角度值:");
  stat=this->drag();
}

AcEdJig::DragStatus CDrawAngLine::sampler()
{
        AcEdJig::DragStatus stat;
  static AcGePoint3d temPoint;
  if(mBasLine==0)
  {
    //寻找基准线
    setUserInputControls((UserInputControls)(AcEdJig::kAccept3dCoordinates|
                                           AcEdJig::kNullResponseAccepted|
                                           AcEdJig::kNoZeroResponseAccepted));
    stat=acquirePoint(mCurPt,mStrPt);
    if(temPoint!=mCurPt)
    {
      temPoint=mCurPt;
      //开始寻找
      geFun->GetNearEntity(mCurPt,pLine);   
    }
    return AcEdJig::kNoChange;
  }
  else
  {
    //让用户输入角度

  }
  return AcEdJig::kNoChange;
}

Adesk::Boolean CDrawAngLine::update()
{
        return Adesk::kTrue;
}

AcDbEntity* CDrawAngLine::entity() const
{
        return pLine;
}

最后是定义一个全局的画角度线的命令
// This is command 'DRAWANGLINE'
void wjredcaddrawangline()
{
        // TODO: Implement the command
  CDrawAngLine* pDrawAngLn=new CDrawAngLine;
  pDrawAngLn->doIt();
  delete pDrawAngLn;
}

//命令注册的初始化代码中的一段
void InitApplication()
{
        // NOTE: DO NOT edit the following lines.
        //{{AFX_ARX_INIT
        AddCommand("WJREDCAD", "AUTOCADINIT", "ACI", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcadautocadinit);
        AddCommand("WJREDCAD", "CREATNEWFILE", "CNF", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcadcreatnewfile);
        AddCommand("WJREDCAD", "OPENEXISTFILE", "OEF", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcadopenexistfile);
        AddCommand("WJREDCAD", "SAVEASFILE", "SAF", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcadsaveasfile);
        AddCommand("WJREDCAD", "PAILIAOSYSTEM", "PLX", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcadpailiaosystem);
        AddCommand("WJREDCAD", "DRAWSPLINE", "DSP", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcaddrawspline);
        AddCommand("WJREDCAD", "DRAWLINE", "DL", ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, wjredcaddrawline);
        AddCommand("WJREDCAD", "DRAWANGLINE", "DAL",
//最后一个命令是画角度线的
ACRX_CMD_TRANSPARENT | ACRX_CMD_USEPICKSET, wjredcaddrawangline);
        //}}AFX_ARX_INIT
        // TODO: add your initialization functions
        wjredcadautocadinit();
}