ObjectArx学习笔记-获取某一图层上所有直线

//-----------------------------------------------------------------------------
//----- acrxEntryPoint.h
//-----------------------------------------------------------------------------
#include "StdAfx.h"
#include "resource.h"
#include "dbsymtb.h"

//-----------------------------------------------------------------------------
#define szRDS _RXST("qxzy")

//-----------------------------------------------------------------------------
//----- ObjectARX EntryPoint
class CGetEntsOnLayerApp : public AcRxArxApp {

public:
	CGetEntsOnLayerApp () : AcRxArxApp () {}

	virtual AcRx::AppRetCode On_kInitAppMsg (void *pkt) {
		// TODO: Load dependencies here

		// You *must* call On_kInitAppMsg here
		AcRx::AppRetCode retCode =AcRxArxApp::On_kInitAppMsg (pkt) ;
		
		// TODO: Add your initialization code here

		return (retCode) ;
	}

	virtual AcRx::AppRetCode On_kUnloadAppMsg (void *pkt) {
		// TODO: Add your code here

		// You *must* call On_kUnloadAppMsg here
		AcRx::AppRetCode retCode =AcRxArxApp::On_kUnloadAppMsg (pkt) ;

		// TODO: Unload dependencies here

		return (retCode) ;
	}

	virtual void RegisterServerComponents () {
	}

public:

	// - qxzyGetEntsOnLayer._GetEntsOnLayer command (do not rename)
	static void qxzyGetEntsOnLayer_GetEntsOnLayer(void)
	{
		// Add your code for command qxzyGetEntsOnLayer._GetEntsOnLayer here
		AcDbLayerTable *pLayerTbl;
		acdbHostApplicationServices()->workingDatabase()
			->getSymbolTable(pLayerTbl,AcDb::kForRead);
		if(!pLayerTbl->has(_T("测试")))
		{
			acutPrintf(_T("\n当前图形中未包含\"测试\"图层！"));
			pLayerTbl->close();
			return;
		}

		AcDbObjectId layerId;
		pLayerTbl->getAt(_T("测试"),layerId);
		pLayerTbl->close();

		AcDbBlockTable *pBlkTbl;
		acdbHostApplicationServices()->workingDatabase()
			->getBlockTable(pBlkTbl, AcDb::kForRead);

		AcDbBlockTableRecord *pBlkTblRcd;
		pBlkTbl->getAt(ACDB_MODEL_SPACE, pBlkTblRcd, AcDb::kForRead);
		pBlkTbl->close();

		AcDbBlockTableRecordIterator *pltr;
		pBlkTblRcd->newIterator(pltr);

		AcDbEntity *pEnt;
		for(pltr->start();!pltr->done();pltr->step())
		{
			pltr->getEntity(pEnt, AcDb::kForWrite);

			if(pEnt->layerId() == layerId)
			{
				//whether it's a line
				AcDbLine *pLine = AcDbLine::cast(pEnt);
				if(pLine != NULL);
				{
					pLine->setColorIndex(1);
				}
			}

			pEnt->close();
		}
		delete pltr;
		pBlkTblRcd->close();

	}
} ;

//-----------------------------------------------------------------------------
IMPLEMENT_ARX_ENTRYPOINT(CGetEntsOnLayerApp)

ACED_ARXCOMMAND_ENTRY_AUTO(CGetEntsOnLayerApp, qxzyGetEntsOnLayer, _GetEntsOnLayer, GetEntsOnLayer, ACRX_CMD_TRANSPARENT, NULL)

转载：http://blog.csdn.net/foreverling/article/details/27305421