objectarx开发笔记4

在ObjectARX 中打开与关闭对象 (2)

一个创建面域的小程序 (2)

加工具条按钮的方法 (3)

如何创建经过任意实体的选择集 (8)

建立新选择集，以及将一个实体添加到一个存在的选择集中 (8)

根据objectid获取ads_name (9)

在ObjectARX 中打开与关闭对象

对arxreference章节的个人理解，如有误解原文之意，请多多指正!

Opening and Closing ObjectARX Objects

本部分代码样例说明了打开与关闭对象的协议。应用此协议之前，你必须确保你所操作的对象是数据库驻留对象。此协议能够确保对象在访问时是内存中的实体(physically)，而不需访问时其可以存储在硬盘上。当你准备修改某个数据库驻留对象时，你首先需要将其打开，代码如下所示:

acdbOpenObject(pObject, objId, AcDb::kForWrite);

此函数有一个Mode parameter可以指出打开对象的方式是for read, write, or notify;仅当对象以AcDb::kForWrite方式打开时，你才可以修改此对象，否则只可以查询对象属性。当完成修改或查询时，你必须显式的将其关闭，代码如下所示:

pObject->close();

如下代码样例改变一个实体(AcDbEntity)的颜色,如下所示:

Acad::ErrorStatus

changeColor(AcDbObjectId entId, Adesk::UInt16 newColor)

{

AcDbEntity *pEntity;

acdbOpenObject(pEntity, entId,

AcDb::kForWrite);

pEntity->setColorIndex(newColor);

pEntity->close();

return Acad::eOk;

}

新的对象实例被以写的方式打开时，一些函数可以在打开对象时一并获取对象标识符(object ID),例如AcDbBlockTable::getAt()函数就是如此。

仅当对象被加入数据库(database)后才能将其关闭。在对象被加入数据库之前，你拥有此对象并且随时可以将其删除。然而请注意，一旦对象被加入数据库后,就不可以将其直接删除。

你可以调用AcDbObject::erase(),此函数将对象标记为已删除状态。被标记为已删除状态的对象实际上一直存在于数据库,直到数据库被销毁时其生命期才真正结束。然而，被标记为已删除状态的对象,不会随图形(drawing)一起作保存，其一直保持(remain)其删除前状态。

注意:直接删除已加入数据库的对象，会导致AutoCad异常终止。

一个创建面域的小程序

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1.static void ahlzlARX_test(void)

2.{

3. AcDbDatabase* pdb = acdbHostApplicationServices()->workingDatabase();

4.

5. AcDbBlockTable* pBlockTable;

6. pdb->getBlockTable(pBlockTable, AcDb::kForRead);

7.

8. AcDbBlockTableRecord* pBlockTableRecord;

9. pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);

10.

11. AcDbCircle* pEnt = new AcDbCircle(AcGePoint3d(1, 2, 0),AcGeVector3d::kZAxis,6);

12. AcDbV oidPtrArray curveSegments, regions;

13. curveSegments.append (pEnt);

14. AcDbRegion::createFromCurves(curveSegments, regions);

15.

16. AcDbRegion *pRegion = static_cast(regions.at(0));

17. pRegion->setDatabaseDefaults();

18.

19. pBlockTableRecord->appendAcDbEntity(pRegion);

20.

21. pBlockTable->close();

22. pBlockTableRecord->close();

23. pRegion->close();

24.}

加工具条按钮的方法

static bool CCgToolApp::getApplication(LPDISPATCH * pVal)

{

LPDISPATCH pDispatch = acedGetAcadWinApp()->GetIDispatch(TRUE);

if (pDispatch == NULL)

return false;

*pVal = pDispatch;

return true;

}

static bool CCgToolApp::getAcadMenuGroup(IAcadMenuGroup **pVal)

{

IAcadApplication *acadApp = NULL;

LPDISPATCH pDisp = NULL;

if (!getApplication(&pDisp))

{

acadApp->Release();

return false;

}

HRESULT hr = S_OK;

hr = pDisp->QueryInterface(IID_IAcadApplication, (LPVOID*)&acadApp);

if (FAILED(hr))

{

acadApp->Release();

return false;

}

LPDISPATCH pTempDisp = NULL;

IAcadMenuGroups *mnuGrps = NULL;

long cnt = 0;

//get the menu groups

hr = acadApp->get_MenuGroups(&mnuGrps);

if (FAILED(hr))

{

acadApp->Release();

return false;

}

acadApp->Release();

mnuGrps->get_Count(&cnt);

//get AutoCAD menu group. say it is index 0.

IAcadMenuGroup *mnuGrp = NULL;

VARIANT vtName;

vtName.vt = VT_I4;

BSTR grpName;

bool found = false;

for (long i = 0; i < cnt; i++)

{

vtName.lVal = i;

hr = mnuGrps->Item(vtName, &mnuGrp);

if (FAILED(hr))

return false;

hr = mnuGrp->get_Name(&grpName);

CString cgrpName(grpName);

if (https://www.360docs.net/doc/549772122.html,pareNoCase(L"Acad") == 0)

{

found = true;

*pVal = mnuGrp;

break;

}

}

acadApp->Release();

return found;

}

static bool CCgToolApp::getToolBar(IAcadToolbars **pVal, CString pName) {

IAcadToolbars *tlbrs;

tlbrs = *pVal;

HRESULT hr = S_OK;

long cnt = 0l;

hr = tlbrs->get_Count(&cnt);

IAcadToolbar *tlbr = NULL;

BSTR tempName;

VARIANT vtName;

bool found = false;

for (long i = 0; i < cnt; i++)

{

vtName.vt = VT_I4;

vtName.lVal = i;

hr = tlbrs->Item(vtName, &tlbr);

if (FAILED(hr))

return found;

hr = tlbr->get_Name(&tempName);

CString tlbName(tempName);

if(https://www.360docs.net/doc/549772122.html,pareNoCase(pName) == 0)

{

found = true;

break;

}

tlbr->Release();

}

//tlbrs->Release();

if (!found)

{

acutPrintf(L"\n没有发现[%s]工具条!", pName);

return found;

}

return found;

}

static void CCgToolApp::CreateToolbar()

{

IAcadMenuGroup *mnuGrp = NULL;

if (!getAcadMenuGroup(&mnuGrp))

return;

//取得所有Toolbar

IAcadToolbars *tlbrs = NULL;

HRESULT hr = S_OK;

hr = mnuGrp->get_Toolbars(&tlbrs);

mnuGrp->Release();

if (getToolBar(&tlbrs, L"cg工具"))

{

tlbrs->Release();

acutPrintf(L"\n[cg工具]工具条已经存在!");

return;

}

//创建Toolbar

IAcadToolbar *tlbr = NULL;

hr = tlbrs->Add(L"cg工具", &tlbr);

if (FAILED(hr))

return;

tlbrs->Release();

//添加Button

IAcadToolbarItem *button1 = NULL;

IAcadToolbarItem *button2 = NULL;

IAcadToolbarItem *button3 = NULL;

long cnt;

hr = tlbr->get_Count(&cnt);

VARIANT index;

index.vt = VT_I4;

index.lVal = cnt + 1;

VARIANT vtFalse;

vtFalse.vt = VT_BOOL;

vtFalse.boolVal = VARIANT_FALSE;

//取得ARX模块路径

TCHAR appFullPath[MAX_PATH];

int len = GetModuleFileName(_hdllInstance, appFullPath, MAX_PATH);

CString strBmpPath = appFullPath;

strBmpPath = strBmpPath.Left(strBmpPath.ReverseFind('\\')) + L"\\bmp";

CComBSTR smallIconName;

CComBSTR largeIconName;

hr = tlbr->AddToolbarButton(index, L"cgt1", L"acedGrRead模式", L"cgt1 ", vtFalse, &button1);

smallIconName = strBmpPath + L"\\1.bmp";

largeIconName = strBmpPath + L"\\1.bmp";

button1->SetBitmaps(smallIconName, largeIconName);

button1->Release();

index.lVal = cnt + 2;

hr = tlbr->AddToolbarButton(index, L"cgt2", L"acedDragGen模式", L"cgt2 ", vtFalse, &button2);

smallIconName = strBmpPath + L"\\1.bmp";

largeIconName = strBmpPath + L"\\1.bmp";

button2->SetBitmaps(smallIconName, largeIconName);

button2->Release();

index.lVal = cnt + 3;

hr = tlbr->AddToolbarButton(index, L"cgt3", L"AcEdJig模式", L"cgt3 ", vtFalse,

&button3);

smallIconName = strBmpPath + L"\\1.bmp";

largeIconName = strBmpPath + L"\\1.bmp";

button3->SetBitmaps(smallIconName, largeIconName);

button3->Release();

//定义菜单浮动(停泊)位置

//tlbr->Dock(acToolbarDockTop);

hr = tlbr->Float(120,720,1);

int nLeft, nTop;

hr = tlbr->get_Left(&nLeft);

hr = tlbr->get_Top(&nTop);

if (FAILED(hr))

acutPrintf(L"\n浮动位置不确定!");

else if(SUCCEEDED(hr))

acutPrintf(L"\n%浮动位置:( %d, %d )", nTop, nLeft);

//设置可见性

VARIANT_BOOL bFlag = VARIANT_TRUE;

tlbr->put_Visible(bFlag);

tlbr->Release();

//

acutPrintf(L"\n[cg工具]工具条加载成功!");

acutPrintf(L"\n");

return;

}

如何创建经过任意实体的选择集

我知道经过线型的选择集的构造方法

pointlist=acutBuildList(RTPOINT,pt1, RTPOINT,pt2, RTPOINT,pt3, RTPOINT,pt4,0)

acedSSGet(“F”,pointlist,NULL,NULL,ss name);

如果是任意实体（比如，圆）呢？请指教

创建经过任意实体的选择集

resbuf *pSel;

pSel = acutBuildList(RTDXF0,"CIRCLE",0);

pointlist=acutBuildList(RTPOINT,pt1, RTPOINT,pt2, RTPOINT,pt3, RTPOINT,pt4,0)

acedSSGet(“F”,pointlist,NULL,pSel,ssname);

选择圆，同理可得

建立新选择集，以及将一个实体添加到一个存在的选择集中

acedSSAdd(NULL,NULL,ss); //建立一个空选择集

if(acedSSAdd(A,ss,ss)!=RTNORM) //将A添加到一个选择集中

{

acutPrintf("添加A到选择集错误!/n");

return BAD;

}

ARX程序很脆弱，容易出错，建议你在程序设计时加上出错处理。程序调试也更方便。

根据objectid获取ads_name

acdbGetAdsName(

ads_name& objName,

AcDbObjectId objId);

objName Output the ads_name

objId Input the object ID

This function fills in objName with the ads_name that corresponds to the objId object ID. Returns Adesk::eOk if successful. If objId is 0, then Acad::eNullObjectId is returned. Include File

dbmain.h