1 说明

AutoCAD中有一个非常实用的功能，当光标移动到一个实体上时，它会显示一个动态的信息空间，光标离开这个实体，信息控件就会隐藏起来。这种显示方式非常便于用户获取图形中不容易得到的实体信息，如下图所示。
本文使用两个简单的例子来说明实现这个功能的方法，在这两个例子中将分别使用AcEdInputPointFilter和AcEdInputPointMonitor反应器来重载AutoCAD鼠标点处实体的提示信息。
环境配置：
AutoCAD2016 64位;
Vs2012；
ObjectARX2015 SDK。

2 思路

在ObjectARX中，这个效果是通过点输入处理机制来实现的，有以下两种实现方式。

2.1 使用AcEdInputPointFilter实现

使用AcEdInputPointFilter完成这个功能需要的基本流程包括：

创建一个从AcEdInputPointFilter类继承的子类，重写processInputPoint函数；
需要启动实体信息动态提示时，为当前文档添加输入点过滤器，处理的对象就是从AcEdInputPointFilter类继承的子类；
需要关闭实体动态提示时，为当前的文档删除输入点过滤器。

2.1.1 创建工程

在VS2012中创建一个名为FilterTest的工程，并添加一个名为CPointFilterSample的类。

2.1.2 改写CPointFilterSample类

将CPointFilterSample类改写为一个从AcEdInputPointFilter类继承的子类，并添加和重写成员函数。
头文件CPointFilterSample.h的内容为：

#pragma once
class CPointFilterSample : public AcEdInputPointFilter
{public:virtual Acad::ErrorStatus processInputPoint(bool& changedPoint, AcGePoint3d& newPoint, bool& displayOsnapGlyph, bool& changedTooltipStr, ACHAR*& newTooltipString, bool& retry, AcGiViewportDraw* drawContext, AcApDocument* document, bool pointComputed, int history, const AcGePoint3d& lastPoint, const AcGePoint3d& rawPoint, const AcGePoint3d& grippedPoint, const AcGePoint3d& cartesianSnappedPoint, const AcGePoint3d& osnappedPoint, AcDb::OsnapMask osnapMask, const AcArray<AcDbCustomOsnapMode*>& customOsnapModes, AcDb::OsnapMask osnapOverrides, const AcArray<AcDbCustomOsnapMode*>& customOsnapOverrides, const AcArray<AcDbObjectId>& pickedEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedPickedEntities, const AcArray<Adesk::GsMarker>& gsSelectionMark, const AcArray<AcDbObjectId>& keyPointEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedKeyPointEntities, const AcArray<Adesk::GsMarker>& keyPointGsSelectionMark, const AcArray<AcGeCurve3d*>& alignmentPaths, const AcGePoint3d& computedPoint, const ACHAR* tooltipString);public:// 弧度转角度static double RadianToAngle(double radian);// 获得PI的值static double PI();};

源文件CPointFilterSample.cpp的内容为：

#include "stdafx.h"
#include "PointFilterSample.h"
Acad::ErrorStatus CPointFilterSample::processInputPoint(bool& changedPoint, AcGePoint3d& newPoint, bool& displayOsnapGlyph, bool& changedTooltipStr, ACHAR*& newTooltipString, bool& retry, AcGiViewportDraw* drawContext, AcApDocument* document, bool pointComputed, int history, const AcGePoint3d& lastPoint, const AcGePoint3d& rawPoint, const AcGePoint3d& grippedPoint, const AcGePoint3d& cartesianSnappedPoint, const AcGePoint3d& osnappedPoint, AcDb::OsnapMask osnapMask, const AcArray<AcDbCustomOsnapMode*>& customOsnapModes, AcDb::OsnapMask osnapOverrides, const AcArray<AcDbCustomOsnapMode*>& customOsnapOverrides, const AcArray<AcDbObjectId>& pickedEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedPickedEntities, const AcArray<Adesk::GsMarker>& gsSelectionMark, const AcArray<AcDbObjectId>& keyPointEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedKeyPointEntities, const AcArray<Adesk::GsMarker>& keyPointGsSelectionMark, const AcArray<AcGeCurve3d*>& alignmentPaths, const AcGePoint3d& computedPoint, const ACHAR* tooltipString)
{// 一定要注意检查缓冲区的大小，避免越界导致的Acad直接跳出TCHAR mtooltipStr[1024], tempStr[1024];mtooltipStr[0] = '\0';Acad::ErrorStatus es;AcDbEntity* pEnt;AcDbObjectId highlightId = AcDbObjectId::kNull;if (pointComputed){// 分析光标所覆盖的实体if (pickedEntities.length() > 0){for (int i = 0; i < pickedEntities.length(); ++i){// 避免显示更多的实体（根据需要确定是否需要）if (i > 0){break;}if (Acad::eOk != (acdbOpenAcDbEntity(pEnt, pickedEntities[i], AcDb::kForRead))){continue;}if (pEnt->isKindOf(AcDbLine::desc())){// 实体类型信息if (_tcslen(mtooltipStr) > 0){_tcscpy(mtooltipStr, TEXT("直线:"));}else{_tcscpy(mtooltipStr, TEXT("\n直线:"));}// 实体详细信息AcDbLine* pLine = AcDbLine::cast(pEnt);double length = pLine->startPoint().distanceTo(pLine->endPoint());AcGeVector3d vec = pLine->endPoint() - pLine->startPoint();double angle = vec.convert2d(AcGePlane::kXYPlane).angle();_stprintf(tempStr, TEXT("\n 长度: %.2f \n 倾角: %.2f"), length, CPointFilterSample::RadianToAngle(angle));_tcscat(mtooltipStr, tempStr);}else if (pEnt->isKindOf(AcDbCircle::desc())){// 实体类型信息if (_tcslen(mtooltipStr) > 0){_tcscpy(mtooltipStr, TEXT("圆:"));}else{_tcscpy(mtooltipStr, TEXT("\n圆:"));}// 实体详细信息AcDbCircle* pCircle = AcDbCircle::cast(pEnt);double radius = pCircle->radius();double area =CPointFilterSample::PI() * radius * radius;_stprintf(tempStr, TEXT("\n 半径: %.2f \n 面积: %.2f"), radius, area);_tcscat(mtooltipStr, tempStr);}pEnt->close();}highlightId = pickedEntities[0];}}// 执行高亮显示，只有在显示最顶层的实体会被高亮显示static AcDbObjectId oldHighlightId = AcDbObjectId::kNull;if (highlightId != oldHighlightId){if (AcDbObjectId::kNull != oldHighlightId){es = acdbOpenAcDbEntity(pEnt, oldHighlightId, AcDb::kForRead);if (es == Acad::eOk){es = pEnt->unhighlight();pEnt->close();oldHighlightId = AcDbObjectId::kNull;}}es = acdbOpenAcDbEntity(pEnt, highlightId, AcDb::kForRead);if (es == Acad::eOk){es = pEnt->highlight();pEnt->close();oldHighlightId = highlightId;}}// 显示其他的提示内容changedTooltipStr = true;newTooltipString = mtooltipStr;return Acad::eOk;
}double CPointFilterSample::RadianToAngle(double radian)
{return radian * 180 / CPointFilterSample::PI();
}double CPointFilterSample::PI()
{return atan(1.0) * 4;
}

2.1.3 改写入口点函数

在入口点函数acrxEntryPoint.cpp中分别注册两个命令AddFilter和RemoveFilter，分别用于在文档中添加和移除输入点过滤器。入口点函数acrxEntryPoint.cpp的文件内容为：

//-----------------------------------------------------------------------------
//----- acrxEntryPoint.cpp
//-----------------------------------------------------------------------------
#include "StdAfx.h"
#include "resource.h"
#include "PointFilterSample.h"CPointFilterSample MyFilter;//-----------------------------------------------------------------------------
#define szRDS _RXST("")//-----------------------------------------------------------------------------
//----- ObjectARX EntryPoint
class CFilterTestApp : public AcRxArxApp {public:CFilterTestApp () : AcRxArxApp () {}virtual AcRx::AppRetCode On_kInitAppMsg (void *pkt) {// TODO: Load dependencies here// You *must* call On_kInitAppMsg hereAcRx::AppRetCode retCode =AcRxArxApp::On_kInitAppMsg (pkt) ;// TODO: Add your initialization code herereturn (retCode) ;}virtual AcRx::AppRetCode On_kUnloadAppMsg (void *pkt) {// TODO: Add your code here// You *must* call On_kUnloadAppMsg hereAcRx::AppRetCode retCode =AcRxArxApp::On_kUnloadAppMsg (pkt) ;// TODO: Unload dependencies herereturn (retCode) ;}virtual void RegisterServerComponents () {}// The ACED_ARXCOMMAND_ENTRY_AUTO macro can be applied to any static member // function of the CFilterTestApp class.// The function should take no arguments and return nothing.//// NOTE: ACED_ARXCOMMAND_ENTRY_AUTO has overloads where you can provide resourceid and// have arguments to define context and command mechanism.// ACED_ARXCOMMAND_ENTRY_AUTO(classname, group, globCmd, locCmd, cmdFlags, UIContext)// ACED_ARXCOMMAND_ENTRYBYID_AUTO(classname, group, globCmd, locCmdId, cmdFlags, UIContext)// only differs that it creates a localized name using a string in the resource file//   locCmdId - resource ID for localized command// Modal Command with localized name// ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyCommand, MyCommandLocal, ACRX_CMD_MODAL)static void MyGroupMyCommand () {// Put your command code here}// Modal Command with pickfirst selection// ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyPickFirst, MyPickFirstLocal, ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET)static void MyGroupMyPickFirst () {ads_name result ;int iRet =acedSSGet (ACRX_T("_I"), NULL, NULL, NULL, result) ;if ( iRet == RTNORM ){// There are selected entities// Put your command using pickfirst set code here}else{// There are no selected entities// Put your command code here}}// Application Session Command with localized name// ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MySessionCmd, MySessionCmdLocal, ACRX_CMD_MODAL | ACRX_CMD_SESSION)static void MyGroupMySessionCmd () {// Put your command code here}//添加输入点过滤器static void MyGroupAddFilter(){curDoc()->inputPointManager()->registerPointFilter( &MyFilter);acutPrintf( _T("输入点过滤器已添加到本文档中.\n") );}//移除输入点过滤器static void MyGroupRemoveFilter(){if ( NULL != curDoc()->inputPointManager()->currentPointFilter() ){curDoc()->inputPointManager()->revokePointFilter();acutPrintf( _T("输入点过滤器已从本文档中移除.\n") );}}// The ACED_ADSFUNCTION_ENTRY_AUTO / ACED_ADSCOMMAND_ENTRY_AUTO macros can be applied to any static member // function of the CFilterTestApp class.// The function may or may not take arguments and have to return RTNORM, RTERROR, RTCAN, RTFAIL, RTREJ to AutoCAD, but use// acedRetNil, acedRetT, acedRetVoid, acedRetInt, acedRetReal, acedRetStr, acedRetPoint, acedRetName, acedRetList, acedRetVal to return// a value to the Lisp interpreter.//// NOTE: ACED_ADSFUNCTION_ENTRY_AUTO / ACED_ADSCOMMAND_ENTRY_AUTO has overloads where you can provide resourceid.//- ACED_ADSFUNCTION_ENTRY_AUTO(classname, name, regFunc) - this example//- ACED_ADSSYMBOL_ENTRYBYID_AUTO(classname, name, nameId, regFunc) - only differs that it creates a localized name using a string in the resource file//- ACED_ADSCOMMAND_ENTRY_AUTO(classname, name, regFunc) - a Lisp command (prefix C:)//- ACED_ADSCOMMAND_ENTRYBYID_AUTO(classname, name, nameId, regFunc) - only differs that it creates a localized name using a string in the resource file// Lisp Function is similar to ARX Command but it creates a lisp // callable function. Many return types are supported not just string// or integer.// ACED_ADSFUNCTION_ENTRY_AUTO(CFilterTestApp, MyLispFunction, false)static int ads_MyLispFunction () {//struct resbuf *args =acedGetArgs () ;// Put your command code here//acutRelRb (args) ;// Return a value to the AutoCAD Lisp Interpreter// acedRetNil, acedRetT, acedRetVoid, acedRetInt, acedRetReal, acedRetStr, acedRetPoint, acedRetName, acedRetList, acedRetValreturn (RTNORM) ;}} ;//-----------------------------------------------------------------------------
IMPLEMENT_ARX_ENTRYPOINT(CFilterTestApp)ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyCommand, MyCommandLocal, ACRX_CMD_MODAL, NULL)
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyPickFirst, MyPickFirstLocal, ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, NULL)
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MySessionCmd, MySessionCmdLocal, ACRX_CMD_MODAL | ACRX_CMD_SESSION, NULL)
ACED_ADSSYMBOL_ENTRY_AUTO(CFilterTestApp, MyLispFunction, false)//向CAD中注册“AddFilter”命令
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, AddFilter, AddFilter, ACRX_CMD_MODAL, NULL)//向CAD中注册“RemoveFilter”命令
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, RemoveFilter,RemoveFilter, ACRX_CMD_MODAL, NULL)

2.1.4 实现效果

编译运行程序，启动AutoCAD2016，在窗口中绘制直线和园，并添加生成的FilterTest.arx文件。执行AddFilter命令，将光标移动到直线和圆附近，就能在图形窗口中看到如图下所示的提示。执行RemoveFilter命令，将光标移动到直线和圆附近，提示恢复原状。

2.2 使用AcEdInputPointFilter实现

使用AcEdInputPointMonitor完成这个功能需要的基本流程包括：

创建一个从AcEdInputPointMonitor类继承的子类，重写monitorInputPoint函数；
需要启动实体信息动态提示时，为当前文档添加输入点监视器，处理的对象就是从AcEdInputPointMonitor类继承的子类；
需要关闭实体动态提示时，为当前的文档删除输入点监视器。

2.2.1 创建工程

在VS2012中创建一个名为MonitorTest的工程，并添加一个名为CPointMonitorSample的类。

2.2.2 改写CPointMonitorSample类

将CPointMonitorSample类改写为一个从AcEdInputPointMonitor类继承的子类，并添加和重写成员函数。
头文件CPointMonitorSample.h的内容为：

#pragma once
class CPointMonitorSample : public AcEdInputPointMonitor
{virtual Acad::ErrorStatus monitorInputPoint(bool& appendToTooltipStr, ACHAR*& additionalTooltipString, AcGiViewportDraw* drawContext, AcApDocument* document, bool pointComputed, int history, const AcGePoint3d& lastPoint, const AcGePoint3d& rawPoint, const AcGePoint3d& grippedPoint, const AcGePoint3d& cartesianSnappedPoint, const AcGePoint3d& osnappedPoint, AcDb::OsnapMask osnapMask, const AcArray<AcDbCustomOsnapMode*>& customOsnapModes, AcDb::OsnapMask osnapOverrides, const AcArray<AcDbCustomOsnapMode*>& customOsnapOverrides, const AcArray<AcDbObjectId>& apertureEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedApertureEntities, const AcArray<Adesk::GsMarker>& gsSelectionMark, const AcArray<AcDbObjectId>& keyPointEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedKeyPointEntities, const AcArray<Adesk::GsMarker>& keyPointGsSelectionMark, const AcArray<AcGeCurve3d*>& alignmentPaths, const AcGePoint3d& computedPoint, const ACHAR* tooltipString);
public:// 弧度转角度static double RadianToAngle(double radian);// 获得PI的值static double PI();};

源文件CPointMonitorSample.cpp的内容为：

#include "stdafx.h"
#include "PointMonitorSample.h"Acad::ErrorStatus CPointMonitorSample::monitorInputPoint(bool& appendToTooltipStr, ACHAR*& additionalTooltipString, AcGiViewportDraw* drawContext, AcApDocument* document, bool pointComputed, int history, const AcGePoint3d& lastPoint, const AcGePoint3d& rawPoint, const AcGePoint3d& grippedPoint, const AcGePoint3d& cartesianSnappedPoint, const AcGePoint3d& osnappedPoint, AcDb::OsnapMask osnapMask, const AcArray<AcDbCustomOsnapMode*>& customOsnapModes, AcDb::OsnapMask osnapOverrides, const AcArray<AcDbCustomOsnapMode*>& customOsnapOverrides, const AcArray<AcDbObjectId>& apertureEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedApertureEntities, const AcArray<Adesk::GsMarker>& gsSelectionMark, const AcArray<AcDbObjectId>& keyPointEntities, const AcArray< AcDbObjectIdArray, AcArrayObjectCopyReallocator< AcDbObjectIdArray > >& nestedKeyPointEntities, const AcArray<Adesk::GsMarker>& keyPointGsSelectionMark, const AcArray<AcGeCurve3d*>& alignmentPaths, const AcGePoint3d& computedPoint, const ACHAR* tooltipString)
{// 一定要注意检查缓冲区的大小，避免越界导致的Acad直接跳出TCHAR mtooltipStr[1024], tempStr[1024];mtooltipStr[0] = '\0';Acad::ErrorStatus es;AcDbEntity* pEnt;AcDbObjectId highlightId = AcDbObjectId::kNull;if (pointComputed){// 分析光标所覆盖的实体if (apertureEntities.length() > 0){for (int i = 0; i < apertureEntities.length(); ++i){// 避免显示更多的实体（根据需要确定是否需要）if (i > 0){break;}if (Acad::eOk != (acdbOpenAcDbEntity(pEnt, apertureEntities[i], AcDb::kForRead))){continue;}if (pEnt->isKindOf(AcDbLine::desc())){// 实体类型信息if (_tcslen(mtooltipStr) > 0){_tcscpy(mtooltipStr, TEXT("直线:"));}else{_tcscpy(mtooltipStr, TEXT("\n直线:"));}// 实体详细信息AcDbLine* pLine = AcDbLine::cast(pEnt);double length = pLine->startPoint().distanceTo(pLine->endPoint());AcGeVector3d vec = pLine->endPoint() - pLine->startPoint();double angle = vec.convert2d(AcGePlane::kXYPlane).angle();_stprintf(tempStr, TEXT("\n 长度: %.2f \n 倾角: %.2f"), length, CPointMonitorSample::RadianToAngle(angle));_tcscat(mtooltipStr, tempStr);}else if (pEnt->isKindOf(AcDbCircle::desc())){// 实体类型信息if (_tcslen(mtooltipStr) > 0){_tcscpy(mtooltipStr, TEXT("圆:"));}else{_tcscpy(mtooltipStr, TEXT("\n圆:"));}// 实体详细信息AcDbCircle* pCircle = AcDbCircle::cast(pEnt);double radius = pCircle->radius();double area = CPointMonitorSample::PI() * radius * radius;_stprintf(tempStr, TEXT("\n 半径: %.2f \n 面积: %.2f"), radius, area);_tcscat(mtooltipStr, tempStr);}pEnt->close();}highlightId = apertureEntities[0];}}// 执行高亮显示，只有在显示最顶层的实体会被高亮显示static AcDbObjectId oldHighlightId = AcDbObjectId::kNull;if (highlightId != oldHighlightId){if (AcDbObjectId::kNull != oldHighlightId){es = acdbOpenAcDbEntity(pEnt, oldHighlightId, AcDb::kForRead);if (es == Acad::eOk){es = pEnt->unhighlight();pEnt->close();oldHighlightId = AcDbObjectId::kNull;}}es = acdbOpenAcDbEntity(pEnt, highlightId, AcDb::kForRead);if (es == Acad::eOk){es = pEnt->highlight();pEnt->close();oldHighlightId = highlightId;}}// 显示其他的提示内容appendToTooltipStr = true;additionalTooltipString = mtooltipStr;return Acad::eOk;
}double CPointMonitorSample::RadianToAngle(double radian)
{return radian * 180 / CPointMonitorSample::PI();
}double CPointMonitorSample::PI()
{return atan(1.0) * 4;
}

2.2.3 改写入口点函数

在入口点函数acrxEntryPoint.cpp中分别注册两个命令AddMonitor和RemoveMonitor，分别用于在文档中添加和移除输入点过滤器。入口点函数acrxEntryPoint.cpp的文件内容为：

//-----------------------------------------------------------------------------
//----- acrxEntryPoint.cpp
//-----------------------------------------------------------------------------
#include "StdAfx.h"
#include "resource.h"
#include "PointMonitorSample.h"CPointMonitorSample MyMonitor;//-----------------------------------------------------------------------------
#define szRDS _RXST("")//-----------------------------------------------------------------------------
//----- ObjectARX EntryPoint
class CFilterTestApp : public AcRxArxApp {public:CFilterTestApp () : AcRxArxApp () {}virtual AcRx::AppRetCode On_kInitAppMsg (void *pkt) {// TODO: Load dependencies here// You *must* call On_kInitAppMsg hereAcRx::AppRetCode retCode =AcRxArxApp::On_kInitAppMsg (pkt) ;// TODO: Add your initialization code herereturn (retCode) ;}virtual AcRx::AppRetCode On_kUnloadAppMsg (void *pkt) {// TODO: Add your code here// You *must* call On_kUnloadAppMsg hereAcRx::AppRetCode retCode =AcRxArxApp::On_kUnloadAppMsg (pkt) ;// TODO: Unload dependencies herereturn (retCode) ;}virtual void RegisterServerComponents () {}// The ACED_ARXCOMMAND_ENTRY_AUTO macro can be applied to any static member // function of the CFilterTestApp class.// The function should take no arguments and return nothing.//// NOTE: ACED_ARXCOMMAND_ENTRY_AUTO has overloads where you can provide resourceid and// have arguments to define context and command mechanism.// ACED_ARXCOMMAND_ENTRY_AUTO(classname, group, globCmd, locCmd, cmdFlags, UIContext)// ACED_ARXCOMMAND_ENTRYBYID_AUTO(classname, group, globCmd, locCmdId, cmdFlags, UIContext)// only differs that it creates a localized name using a string in the resource file//   locCmdId - resource ID for localized command// Modal Command with localized name// ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyCommand, MyCommandLocal, ACRX_CMD_MODAL)static void MyGroupMyCommand () {// Put your command code here}// Modal Command with pickfirst selection// ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyPickFirst, MyPickFirstLocal, ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET)static void MyGroupMyPickFirst () {ads_name result ;int iRet =acedSSGet (ACRX_T("_I"), NULL, NULL, NULL, result) ;if ( iRet == RTNORM ){// There are selected entities// Put your command using pickfirst set code here}else{// There are no selected entities// Put your command code here}}// Application Session Command with localized name// ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MySessionCmd, MySessionCmdLocal, ACRX_CMD_MODAL | ACRX_CMD_SESSION)static void MyGroupMySessionCmd () {// Put your command code here}//添加输入点监视器static void MyGroupAddMonitor(){curDoc()->inputPointManager()->addPointMonitor( &MyMonitor);acutPrintf( _T("输入监视器已添加到本文档中.\n") );}//移除输入点监视器static void MyGroupRemoveMonitor(){curDoc()->inputPointManager()->removePointMonitor( &MyMonitor);acutPrintf( _T("输入点监视器已从本文档中移除.\n") );}// The ACED_ADSFUNCTION_ENTRY_AUTO / ACED_ADSCOMMAND_ENTRY_AUTO macros can be applied to any static member // function of the CFilterTestApp class.// The function may or may not take arguments and have to return RTNORM, RTERROR, RTCAN, RTFAIL, RTREJ to AutoCAD, but use// acedRetNil, acedRetT, acedRetVoid, acedRetInt, acedRetReal, acedRetStr, acedRetPoint, acedRetName, acedRetList, acedRetVal to return// a value to the Lisp interpreter.//// NOTE: ACED_ADSFUNCTION_ENTRY_AUTO / ACED_ADSCOMMAND_ENTRY_AUTO has overloads where you can provide resourceid.//- ACED_ADSFUNCTION_ENTRY_AUTO(classname, name, regFunc) - this example//- ACED_ADSSYMBOL_ENTRYBYID_AUTO(classname, name, nameId, regFunc) - only differs that it creates a localized name using a string in the resource file//- ACED_ADSCOMMAND_ENTRY_AUTO(classname, name, regFunc) - a Lisp command (prefix C:)//- ACED_ADSCOMMAND_ENTRYBYID_AUTO(classname, name, nameId, regFunc) - only differs that it creates a localized name using a string in the resource file// Lisp Function is similar to ARX Command but it creates a lisp // callable function. Many return types are supported not just string// or integer.// ACED_ADSFUNCTION_ENTRY_AUTO(CFilterTestApp, MyLispFunction, false)static int ads_MyLispFunction () {//struct resbuf *args =acedGetArgs () ;// Put your command code here//acutRelRb (args) ;// Return a value to the AutoCAD Lisp Interpreter// acedRetNil, acedRetT, acedRetVoid, acedRetInt, acedRetReal, acedRetStr, acedRetPoint, acedRetName, acedRetList, acedRetValreturn (RTNORM) ;}} ;//-----------------------------------------------------------------------------
IMPLEMENT_ARX_ENTRYPOINT(CFilterTestApp)ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyCommand, MyCommandLocal, ACRX_CMD_MODAL, NULL)
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MyPickFirst, MyPickFirstLocal, ACRX_CMD_MODAL | ACRX_CMD_USEPICKSET, NULL)
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, MySessionCmd, MySessionCmdLocal, ACRX_CMD_MODAL | ACRX_CMD_SESSION, NULL)
ACED_ADSSYMBOL_ENTRY_AUTO(CFilterTestApp, MyLispFunction, false)//向CAD中注册“AddMonitor”命令
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, AddMonitor, AddMonitor, ACRX_CMD_MODAL, NULL)//向CAD中注册“RemoveMonitor”命令
ACED_ARXCOMMAND_ENTRY_AUTO(CFilterTestApp, MyGroup, RemoveMonitor,RemoveMonitor, ACRX_CMD_MODAL, NULL)

2.2.4 实现效果

编译运行程序，启动AutoCAD2016，在窗口中绘制直线和园，并添加生成的MonitorTest.arx文件。执行AddMonitor命令，将光标移动到直线和圆附近，就能在图形窗口中看到如图下所示的提示。执行RemoveMonitor命令，将光标移动到直线和圆附近，提示恢复原状。

3 总结

使用AcEdInputPointFilter和AcEdInputPointMonitor反应器，都能实现光标提示功能，二者的功能类似，不同之处在于AcEdInputPointMonitor无法更改点，工具提示字符串，或要求系统重试。
在新版本的ObjectARX SDK中，AcEdInputPointFilter和AcEdInputPointMonitor分别增加了一种重载形式，并定义了3个类。使用新的重载形式可以更加简便地（篇幅上）实现以上功能。

//新增的重载形式
ACAD_PORT virtual Acad::ErrorStatus monitorInputPoint(const AcEdInputPoint& input, AcEdInputPointMonitorResult& output);
ACAD_PORT virtual Acad::ErrorStatus processInputPoint(const AcEdInputPoint& input, AcEdInputPointFilterResult& output);//新增的3个类
class AcEdInputPoint;
class AcEdInputPointFilterResult;
class AcEdInputPointMonitorResult;

4 源代码

链接: https://pan.baidu.com/s/1FvaCZeszoTDZmTWO80Rp7w
提取码：uj7l

参考文档
[1]:Autodesk ObjectARX for AutoCAD 2015: Developer Guide.
[2]:AutoCAD ObjectARX(VC) 开发基础与实例教程.

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