C++ objectarx二次开发获取所有的自定义实体,并修改自定义实体数据更新图形代码示例
时间: 2024-03-05 18:53:34 浏览: 13
以下是一个简单的C++ ObjectARX示例代码,用于获取所有的自定义实体并修改自定义实体数据更新图形:
```cpp
#include "stdafx.h"
#include "acdb.h"
#include "dbmain.h"
#include "dbents.h"
#include "dbsymtb.h"
#include "dbapserv.h"
#include "adslib.h"
void ModifyCustomEntities()
{
AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();
AcDbBlockTable *pBlockTable = nullptr;
AcDbBlockTableRecord *pModelSpace = nullptr;
AcDbObjectIdArray objIds;
AcDbObjectId objId;
AcDbEntity *pEntity = nullptr;
AcDbAttributeDefinition *pAttDef = nullptr;
AcDbAttribute *pAtt = nullptr;
// Open model space block table record for write
acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable, AcDb::kForRead);
pBlockTable->getAt(ACDB_MODEL_SPACE, pModelSpace, AcDb::kForWrite);
pBlockTable->close();
// Get all custom entities in model space
AcDbBlockTableRecordIterator *pIter = pModelSpace->newIterator();
for (; !pIter->done(); pIter->step())
{
objIds.append(pIter->objectId()); // Collect all entity object IDs
}
delete pIter;
// Modify custom entities and update graphics
for (int i = 0; i < objIds.length(); i++)
{
objId = objIds[i];
if (acdbOpenAcDbEntity(pEntity, objId, AcDb::kForWrite) == Acad::eOk)
{
// Check if it's a custom entity
if (pEntity->isA() == MyCustomEntity::desc())
{
// Modify entity data
MyCustomEntity *pCustomEntity = (MyCustomEntity*)pEntity;
pCustomEntity->SetMyData(1234);
// Update entity graphics
AcGiViewportDraw *pViewportDraw = acdbHostApplicationServices()->viewportDraw();
pViewportDraw->geometryModified(*pEntity);
}
pEntity->close();
}
}
// Close model space block table record
pModelSpace->close();
}
```
在这个示例中,我们首先通过`acdbHostApplicationServices()->workingDatabase()`获取当前工作数据库的指针,然后通过`getSymbolTable()`方法打开块表,并获取模型空间的指针。接着,我们使用`newIterator()`方法遍历模型空间中的所有实体,并将自定义实体的ID存入`objIds`数组中。
在遍历完所有实体后,我们使用`acdbOpenAcDbEntity()`方法打开每个自定义实体,并进行修改。修改完成后,我们使用`acdbHostApplicationServices()->viewportDraw()`方法获取视口绘制器对象,然后调用`geometryModified()`方法更新实体的图形。
需要注意的是,在实际的开发中,您需要根据具体需求修改代码,并处理异常情况和内存泄漏等问题。