ObjectARX之Mac os开发

网上关于ObjectARX开发的相关介绍都基于Windows环境。Mac 环境的开发几乎没有，下面介绍Mac环境下ObjectARX的开发。

 AutoCAD ObjectARX开发必备条件:

1. 安装Mac 版AutoCAD

2. 安装AutoCAD版本对应的ObjectARX 的SDK

本文以AutoCAD 2018 及对应的ObjectARX SDK，ObjectARX 2018 SDK 下载链接:http://help.autodesk.com/view/OARXMAC/2018/ENU/

ObjectARX SDK安装成功后的路径如下图:

打开Xcode 新建项目时会出现Auto CAD项目信息:

新建arx项目后，xcode会自动创建一个arxmian.cpp文件。代码如下

 1 #if defined(_DEBUG) && !defined(AC_FULL_DEBUG) 2 #error _DEBUG should not be defined except in internal Adesk debug builds 3 #endif 4  5 #include <aced.h> 6 #include <rxregsvc.h> 7  8 void mycmd() 9 {10     acutPrintf(L"My command");11 }12 13 // Initialization function called from acrxEntryPoint during14 // kInitAppMsg case.  This function is used to add commands15 // to the command stack.16 //17 void18 initApp()19 {20     acedRegCmds->addCommand(L"MYARX_COMMANDS", L"mycmd", L"mycmd", ACRX_CMD_MODAL, mycmd);21 }22 23 24 // Clean up function called from acrxEntryPoint during the25 // kUnloadAppMsg case.  This function removes this app's26 // command set from the command stack.27 //28 void29 unloadApp()30 {31     acedRegCmds->removeGroup(L"MYARX_COMMANDS");32 }33 34 35 // ARX entry point36 //37 extern "C"38 AcRx::AppRetCode acrxEntryPoint(AcRx::AppMsgCode msg, void* appId)39 {40     switch (msg) {41     case AcRx::kInitAppMsg:42         acrxDynamicLinker->unlockApplication(appId);43     acrxDynamicLinker->registerAppMDIAware(appId);44         initApp();45         break;46     case AcRx::kUnloadAppMsg:47         unloadApp();48         break;49     default: break;50     }51     return AcRx::kRetOK;52 }

例子会注册一个新的命令到AutoCAD中，下面我们通过命令插入一条直线

void createLine() {    AcGePoint3d startPoint(4, 2, 0);    AcGePoint3d endPoint(6, 5, 0);    AcDbLine* pLine = new AcDbLine(startPoint, endPoint);    //获取block 表    AcDbBlockTable *pBlockTable;    acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);    //获取模型空间    AcDbBlockTableRecord* pModelSpace;    pBlockTable->getAt(ACDB_MODEL_SPACE, pModelSpace, AcDb::kForWrite);    //向模型空间添加该直线并返回其id    AcDbObjectId lineId;    pModelSpace->appendAcDbEntity(lineId, pLine);        //关闭相关对象    pLine->close();    pModelSpace->close();    pBlockTable->close();}

然后在mycmd函数中调用该函数:

 

void createLine();void mycmd(){    acutPrintf(L"Create Line");    createLine();}

 

编译项目生成bundle文件

 

然后我们打开AutoCAD 2018 加载该bundle文件:

 

在AutoCAD的命令行中输入 mycmd就会绘制一条线出来