#include <adslib.h>
     #include <rxdlinkr.h>
     #include <aced.h>
     #include <dbents.h>
     #include <geassign.h>
     #include <dbsymtb.h>
     #include <dbapserv.h>

Acad::ErrorStatus newLine();

void addLineCommand()
{
//{{BEGIN_LEVEL_ADVANCED
    if (newLine()==Acad::eOk)
        acutPrintf("Success\n");
    else
        acutPrintf("Failed\n");
//{{END_LEVEL_ADVANCED
}

Acad::ErrorStatus 
postToDatabase(/*[in]*/AcDbEntity* pEnt,/*[out]*/AcDbObjectId& idObj)

{
	Acad::ErrorStatus	  es;
	AcDbBlockTable*		pBlockTable;
	AcDbBlockTableRecord*  pSpaceRecord;
	//確定當前有正在工作的數據庫
    if (acdbHostApplicationServices()->workingDatabase()==NULL)
        return Acad::eNoDatabase;
    //獲得當前圖形的指針
    //獲得圖形的塊表，打開準備讀取數據
    if ((es = acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead))==Acad::eOk){
	//獲得建模空間的記錄，打開準備寫數據  
	
        if ((es = pBlockTable->getAt(ACDB_MODEL_SPACE, pSpaceRecord, AcDb::kForWrite))==Acad::eOk){
    //添加實體指針到建模空間后關閉指針和建模空間記錄
	
            if ((es = pSpaceRecord->appendAcDbEntity(idObj, pEnt))==Acad::eOk)
                pEnt->close();
            pSpaceRecord->close();
        }
	//關閉塊表
	    pBlockTable->close();

    }
	//返回狀態信息
	return es;
}

Acad::ErrorStatus newLine()
{

	ads_point pt1, pt2;//定義兩個ads_point的點
	int retval;

	try 
	{
		//從用戶處獲得第一點

	if ((retval = acedGetPoint(NULL, "\nSelect lower left:  ",        pt1)) != RTNORM) 
			throw retval;

		//以第一點為基點, 從用戶處獲得第二點.
		

		if ((retval = acedGetPoint(pt1, "\nSelect upper right:  ", pt2)) != RTNORM)
			throw retval;

	}
	catch (int e)
	{
		if (e == RTCAN)
    //判斷輸入錯誤程序中斷
			return Acad::eUserBreak;
		if (e == RTERROR)
     //判斷無效輸入
			return Acad::eInvalidInput;
	}

	
// 將ads_point類型的點轉換為AcGePoint3d類型之后創建直線
	AcDbLine* pLine = new AcDbLine(asPnt3d(pt1), asPnt3d(pt2));

//如果創建直線出錯,返回錯誤信息
	if (!pLine)
	{
		acedAlert("Not enough memory to create a Line!");
		return Acad::eOutOfMemory;
	}
    AcDbObjectId id;  //定義對象ID
	return postToDatabase(pLine, id);
}

extern "C" AcRx::AppRetCode 
acrxEntryPoint(AcRx::AppMsgCode msg, void* pkt) 
{
    switch (msg) {
    case AcRx::kInitAppMsg:

        acrxDynamicLinker->unlockApplication(pkt); 
		

		acrxDynamicLinker->registerAppMDIAware(pkt);

        //注冊命令
		
    acedRegCmds->addCommand("EXAM03","addline","addline",ACRX_CMD_MODAL,addLineCommand);

        break;
    case AcRx::kUnloadAppMsg:
        //當應用程序卸載后,為防止AUOTCAD調用此命令,產生不必要的 
        //錯誤,移走命令組
        
        acedRegCmds->removeGroup("EXAM03");

        break;
    }
    return AcRx::kRetOK;
}