通过acedSSGet函数获取用户选择集，然后将这些选择集中的图形转换成一个新块，并在同
这段代码首先从用户选择集中获取实体，然后创建一个新的块并将这些实体复制到新块中。最后，将原来的实体替换为指向新块的新插入参照，保持其原始位置不变。注意这只是一个基础示例，实际操作中还需要考虑更多细节，如错误处理、事务管理等。#include "acedinpt.h" // For acedSSGet#include "dbmain.h" // For AcDbEntity and related classes
#include "dbdict.h" // For AcDbDictionary
#include "dbidmap.h" // For AcDbIdMapping
#include "dbtrans.h" // For AcDbTransaction
// Function to create a block from the selected set of entities and insert it back at the same location
void CreateBlockFromSelection()
{
ads采用name ss;
struct resbuf rb;
// Get the user selection
acedSSGet(NULL, NULL, NULL, NULL, ss);
// Check if there's a valid selection
if (ss != RTNORM)
return;
AcDbVoidPtrArray entities;
Acad::ErrorStatus es = acdbGsMarker(ss, entities);
if (es != Acad::eOk)
{
acutPrintf("\nFailed to get entities from selection.");
return;
}
if (entities.isEmpty())
{
acutPrintf("\nNo entities were selected.");
return;
}
// Start a transaction
AcDbTransaction trans;
es = trans.start();
if (es != Acad::eOk)
{
acutPrintf("\nFailed to start transaction.");
return;
}
try
{
// Open the current database in write mode
AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();
// Define a unique block name
char blockName;
采用itoa(time(NULL), blockName, 10); // Use timestamp as a simple way to generate a unique name
// Create the block definition
AcDbBlockTableRecord* pNewBlock = new AcDbBlockTableRecord();
es = pNewBlock->setName(blockName);
if (es != Acad::eOk)
{
delete pNewBlock;
throw std::runtime采用error("Failed to set block name.");
}
// Append entities to the block table record
AcDbBlockTableRecord::Iterator iter(*pNewBlock);
for (int i = 0; i < entities.length(); ++i)
{
AcDbEntity* pEnt;
es = acdbOpenObject(pEnt, (AcDbObjectId)entities, AcDb::kForWrite);
if (es == Acad::eOk)
{
pEnt->upgradeOpen();
es = pNewBlock->appendAcDbEntity(iter, pEnt);
if (es != Acad::eOk)
{
pEnt->close();
throw std::runtime采用error("Failed to append entity to block.");
}
pEnt->close();
}
}
// Add the block definition to the block table dictionary
AcDbDictionary* pBlockDict;
es = pDb->getSymbolTable(pBlockDict, AcDb::kForWrite);
if (es == Acad::eOk)
{
es = pBlockDict->setAt(blockName, pNewBlock, AcDb::kTrue);
if (es != Acad::eOk)
{
throw std::runtime采用error("Failed to add block to dictionary.");
}
pBlockDict->close();
}
// Insert the block back to the original locations
AcDbIdMapping idMap;
AcDbBlockReference* pBlkRef;
for (int i = 0; i < entities.length(); ++i)
{
AcDbEntity* pEnt;
es = acdbOpenObject(pEnt, (AcDbObjectId)entities, AcDb::kForWrite);
if (es == Acad::eOk)
{
AcGeMatrix3d oldToNew;
oldToNew.setToIdentity();
pBlkRef = new AcDbBlockReference();
pBlkRef->setBlockTableRecord(pNewBlock->objectId());
pBlkRef->setPosition(pEnt->position()); // Set insert point to entity's original position
pBlkRef->setTransform(oldToNew);
es = pEnt->handOverTo(idMap, pBlkRef);
if (es != Acad::eOk)
{
delete pBlkRef;
throw std::runtime采用error("Failed to handover entity to block reference.");
}
pBlkRef->close();
pEnt->erase();
pEnt->close();
}
}
// Commit the transaction
trans.commit();
}
catch (const std::exception& ex)
{
acutPrintf("\nError: %s", ex.what());
trans.abort();
}
// Clear the selection set
acdbClear采用ss(ss);
}
// Call the function
CreateBlockFromSelection();
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