LayerChooser --- an arx 4 AutoCAD2007

// very easy an simple 
// code by s91
// s91.ctgu.cn@gmail.com
//
// (C) Copyright 2002-2005 by Autodesk, Inc. 
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted, 
// provided that the above copyright notice appears in all copies and 
// that both that copyright notice and the limited warranty and
// restricted rights notice below appear in all supporting 
// documentation.
//
// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS. 
// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.  AUTODESK, INC. 
// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to 
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable.
//

//-----------------------------------------------------------------------------
//----- acrxEntryPoint.h
//-----------------------------------------------------------------------------
#include "StdAfx.h"
#include "resource.h"
#include <dbsymtb.h>
//-----------------------------------------------------------------------------
#define szRDS _RXST("")

//-----------------------------------------------------------------------------
//----- ObjectARX EntryPoint
class CLayerChooserApp : public AcRxArxApp ...{

public:
        CLayerChooserApp () : 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:

        // - LayerChooser._LayerChooser command (do not rename)
        static void LayerChooser_LayerChooser(void)
        ...{
                // Add your code for command LayerChooser._LayerChooser here
                ACHAR result[16];
                ACHAR t1[1],t2[1];//存储图层名及输入的字符用与比较
                //ACHAR *LayerName = NULL;
                acedGetString(0,_T("Please Input the Layer Name: "),result);
                //acutPrintf(result);
                t1[0] = result[0];
                int n = 0;//判断是否找到图层
                AcDbLayerTable *pLayerTbl;
                acdbHostApplicationServices()->workingDatabase()
                        ->getSymbolTable(pLayerTbl, AcDb::kForRead);

                // Create a new iterator that starts at table
                // beginning and skips deleted.
                //
                //code by s91
               // s91.ctgu.cn@gmail.com
                AcDbLayerTableIterator *pLayerIterator;
                pLayerTbl->newIterator(pLayerIterator);

                // Walk the table, getting every table record and
                // printing the linetype name.
                //
                AcDbLayerTableRecord *pLayerTableRcd;
                ACHAR *pLtName;
                for (; !pLayerIterator->done(); pLayerIterator->step()) 
                ...{
                        pLayerIterator->getRecord(pLayerTableRcd, AcDb::kForRead);
                        pLayerTableRcd->getName(pLtName);
                        pLayerTableRcd->close();
                        //acutPrintf(_T(" Linetype name is:  %s"), pLtName);
                        t2[0] = pLtName[0];
                        //n = _tcscmp(t1,t2);
                        if (t1[0] == t2[0])
                        ...{
                                // LayerName = pLtName;
                                struct resbuf pResult;
                                ::acedGetVar(_T("CLAYER"),&pResult);//取得当前图层
                                pResult.resval.rstring = pLtName;
                                ::acedSetVar(_T("CLAYER"), &pResult);//将输入的图层设为当前层
                                                                     //相当于命令 CLAYER LAYERNAME
                                //acutPrintf(_T(" Linetype name is:  %s"), pResult.resval.rstring);
                                free(pLtName);
                                n = 1;//如果图层找到，则将n赋值为1
                        }
                        else
                        ...{
                                free(pLtName);
                        }
                }
                if (n == 0)
                ...{
                        acutPrintf(_T(" The layer was not found!"));
                }
                delete pLayerIterator;
                pLayerTbl->close();
                // acutPrintf(_T(" Linetype name"));

                // acutPrintf(_T(" Linetype name is:  %s"), pResult.resval.rstring);


        }
} ;

//-----------------------------------------------------------------------------
IMPLEMENT_ARX_ENTRYPOINT(CLayerChooserApp)

ACED_ARXCOMMAND_ENTRY_AUTO(CLayerChooserApp, LayerChooser, _LayerChooser, LayerChooser, ACRX_CMD_TRANSPARENT, NULL)