I'm currently working with AutoCAD 2021 and have installed the ObjectARX 2021 SDK. To get familiar with the SDK, I explored the sample projects provided, specifically "custobj_dg" and "polysamp". By analyzing the structure of these examples, I gained a deeper understanding of the SDK's framework and was able to develop my own C++ code.
#pragma once
#include <Windows.h>
#include <rxobject.h>
#include <rxregsvc.h>
#include <aced.h>
#include <dbsymtb.h>
#include <dbapserv.h>
#include <adslib.h>
#include "tchar.h"
#include <dbobjptr.h>
void initApp();
void unloadApp();
Acad::ErrorStatus postToDb(AcDbEntity* ent);
Acad::ErrorStatus postToDb(AcDbEntity* ent, AcDbObjectId& objId);
extern "C"
AcRx::AppRetCode acrxEntryPoint(AcRx::AppMsgCode, void*);
class MyCustomEnt : public AcDbEntity
{
public:
ACRX_DECLARE_MEMBERS(MyCustomEnt);
MyCustomEnt() : mRadius(0), mCenter(0,0,0) {};
MyCustomEnt(const double& rad, AcGePoint3d& center) : mRadius(rad), mCenter(center) {};
// Override necessary methods
virtual Acad::ErrorStatus dwgOutFields(AcDbDwgFiler* pFiler) const override;
virtual Acad::ErrorStatus dwgInFields(AcDbDwgFiler* pFiler) override;
void setCircleParameters(const AcGePoint3d& center, double radius);
protected:
virtual Adesk::Boolean subWorldDraw(AcGiWorldDraw* mode);
private:
// Store circle data
AcGePoint3d mCenter;
double mRadius;
};
ACRX_DXF_DEFINE_MEMBERS(MyCustomEnt, AcDbObject, AcDb::kDHL_CURRENT, AcDb::kMReleaseCurrent, 0, MyCustomEnt, SAMP2);
void MyCustomEnt::setCircleParameters(const AcGePoint3d& center, double radius)
{
assertWriteEnabled();
mCenter = center;
mRadius = radius;
}
Acad::ErrorStatus MyCustomEnt::dwgOutFields(AcDbDwgFiler* pFiler) const
{
assertReadEnabled();
Acad::ErrorStatus es = AcDbEntity::dwgOutFields(pFiler);
if (es != Acad::eOk) return es;
// Write the center point and radius
pFiler->writePoint3d(mCenter);
pFiler->writeDouble(mRadius);
return pFiler->filerStatus();
}
Acad::ErrorStatus MyCustomEnt::dwgInFields(AcDbDwgFiler* pFiler)
{
assertWriteEnabled();
Acad::ErrorStatus es = AcDbEntity::dwgInFields(pFiler);
if (es != Acad::eOk) return es;
// Read the center point and radius
pFiler->readPoint3d(&mCenter);
pFiler->readDouble(&mRadius);
return pFiler->filerStatus();
}
Adesk::Boolean MyCustomEnt::subWorldDraw(AcGiWorldDraw* pWorldDraw)
{
assertReadEnabled();
// Define the offsets for the four circles
AcGeVector3d offsets[] = {
AcGeVector3d(mRadius * 2, 0.0, 0.0),
AcGeVector3d(-mRadius * 2, 0.0, 0.0),
AcGeVector3d(0.0, mRadius * 2, 0.0),
AcGeVector3d(0.0, -mRadius * 2, 0.0)
};
// Draw each circle
for (int i = 0; i < 4; ++i)
{
AcGePoint3d circleCenter = mCenter + offsets[i];
pWorldDraw->geometry().circle(circleCenter, mRadius, AcGeVector3d::kZAxis);
}
return Adesk::kTrue;
}
void addMyCustomEntToDrawing()
{
// Create a new instance of MyCustomEnt
MyCustomEnt* pMyCustomEnt = new MyCustomEnt();
pMyCustomEnt->setCircleParameters(AcGePoint3d(0.0, 0.0, 0.0), 5.0); // Example parameters
postToDb(pMyCustomEnt);
//// Close the custom entity to decrement its reference count
Acad::ErrorStatus es = pMyCustomEnt->close();
}
Acad::ErrorStatus
postToDb(AcDbEntity* ent)
//
// Append specified entity to current space of current drawing.
//
{
AcDbObjectId objId;
return postToDb(ent, objId);
}
Acad::ErrorStatus
postToDb(AcDbEntity* ent, AcDbObjectId& objId)
{
Acad::ErrorStatus es;
AcDbBlockTable* pBlockTable;
AcDbBlockTableRecord* pSpaceRecord;
if ((es = acdbHostApplicationServices()->workingDatabase()->
getSymbolTable(pBlockTable, AcDb::kForRead))
!= Acad::eOk) {
return es;
}
if ((es = pBlockTable->getAt(ACDB_MODEL_SPACE,
pSpaceRecord,
AcDb::kForWrite)) != Acad::eOk) {
return es;
}
if ((es = pSpaceRecord->appendAcDbEntity(objId, ent)) != Acad::eOk) {
return es;
}
if ((es = pSpaceRecord->close()) != Acad::eOk) {
return es;
}
if ((es = pBlockTable->close()) != Acad::eOk) {
return es;
}
return ent->close();
}
void
initApp()
{
acedRegCmds->addCommand(_T("MyCustomEnt_CMDS"),
_T("FOUR_CIRCLES"), _T("FCC"), ACRX_CMD_MODAL,
addMyCustomEntToDrawing);
MyCustomEnt::rxInit();
acrxBuildClassHierarchy();
}
//
//
// The clean up function called from the acrxEntryPoint() function during the
// kUnloadAppMsg case removes this application's
// command set from the command stack and removes this application's
// custom classes from the ACRX runtime class hierarchy.
//
void
unloadApp()
{
acedRegCmds->removeGroup(_T("MyCustomEnt_CMDS"));
deleteAcRxClass(MyCustomEnt::desc());
}
//
// END CODE APPEARING IN SDK DOCUMENT.
//
//
// ARX entry point
//
AcRx::AppRetCode
acrxEntryPoint(AcRx::AppMsgCode msg, void* appId)
{
switch (msg) {
case AcRx::kInitAppMsg:
acrxDynamicLinker->unlockApplication(appId);
acrxDynamicLinker->registerAppMDIAware(appId);
initApp();
break;
case AcRx::kUnloadAppMsg:
unloadApp();
}
return AcRx::kRetOK;
}
Upon reaching line 118, continuing the debugging process triggers an exception as soon as the execution exits the "addMyCustomEntToDrawing()" method.
Could you please help me identify the issue in my code? I'm unsure if I've made an error or if there are any missing external references or files.
