ObjectARX之Mac os開發

網上關於ObjectARX開發的相關介紹都基於Windows環境。Mac 環境的開發幾乎沒有，下麵介紹Mac環境下ObjectARX的開發。

 AutoCAD ObjectARX開發必備條件:

1. 安裝Mac 版AutoCAD

2. 安裝AutoCAD版本對應的ObjectARX 的SDK

本文以AutoCAD 2018 及對應的ObjectARX SDK，ObjectARX 2018 SDK 下載鏈接:http://help.autodesk.com/view/OARXMAC/2018/ENU/

ObjectARX SDK安裝成功後的路徑如下圖:

打開Xcode 新建項目時會出現Auto CAD項目信息:

新建arx項目後，xcode會自動創建一個arxmian.cpp文件。代碼如下

 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 during
14 // kInitAppMsg case.  This function is used to add commands
15 // to the command stack.
16 //
17 void
18 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 the
25 // kUnloadAppMsg case.  This function removes this app's
26 // command set from the command stack.
27 //
28 void
29 unloadApp()
30 {
31     acedRegCmds->removeGroup(L"MYARX_COMMANDS");
32 }
33 
34 
35 // ARX entry point
36 //
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 }

例子會註冊一個新的命令到AutoCAD中，下麵我們通過命令插入一條直線

void createLine() {
    AcGePoint3d startPoint(4, 2, 0);
    AcGePoint3d endPoint(6, 5, 0);
    AcDbLine* pLine = new AcDbLine(startPoint, endPoint);
    //獲取block 表
    AcDbBlockTable *pBlockTable;
    acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);
    //獲取模型空間
    AcDbBlockTableRecord* pModelSpace;
    pBlockTable->getAt(ACDB_MODEL_SPACE, pModelSpace, AcDb::kForWrite);
    //向模型空間添加該直線並返回其id
    AcDbObjectId lineId;
    pModelSpace->appendAcDbEntity(lineId, pLine);
    
    //關閉相關對象
    pLine->close();
    pModelSpace->close();
    pBlockTable->close();
}

然後在mycmd函數中調用該函數:

void createLine();

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

編譯項目生成bundle文件

然後我們打開AutoCAD 2018 載入該bundle文件:

在AutoCAD的命令行中輸入 mycmd就會繪製一條線出來