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摘自《 ObjectARX2000开发技术指南》
我们用下面的例子说明如何使用块表记录遍历器遍历块表记录，并在屏幕上打印出块中所含对象的信息。
程序中用printAll()函数打开一个块表进行读操作，然后根据用户提供的块名打开块表记录，使用一个新块表记录遍历器遍历块表记录。如果记录中含有实体，则遍历器打印出该实体的信息
void
printAll()
{
int rc;
char blkName[50];
rc = acedGetString(Adesk::kTrue,
"请输入块名:",
blkName);
if(rc!=RTNORM)
return;
if(blkName[0]=='\0'){
if(acdbHostApplicationServices()->workingDatabase()
->tilemode() == Adesk::kFalse){
struct resbuf rb;
acedGetVar("cvport",&rb);
if(rb.resval.rint == 1){
strcpy(blkName,ACDB_PAPER_SPACE);
}else{
strcpy(blkName,ACDB_MODEL_SPACE);
}
}else{
strcpy(blkName,ACDB_MODEL_SPACE);
}
}
AcDbBlockTable* pBlockTable;
acdbHostApplicationServices()->workingDatabase()
->getSymbolTable(pBlockTable,AcDb::kForRead);
AcDbBlockTableRecord *pBlockTableRecord;
pBlockTable->getAt(blkName,pBlockTableRecord,
AcDb::kForRead);
AcDbBlockTableRecordIterator *pBlockIterator;
pBlockTableRecord ->newIterator(pBlockIterator);
for(;!pBlockIterator->done();
pBlockIterator->step())
{
AcDbEntity *pEntity;
pBlockIterator->getEntity(pEntity,AcDb::kForRead);
AcDbHandle objHandle;
pEntity->getAcDbHandle(objHandle);
char handleStr[20];
objHandle.getIntoAsciiBuffer(handkeStr);
const char *pCname = pEntity->isA()->name();
acutPrintf("对象ID%lx,名柄%s,类名%s.\n",
pEntity->objId(),handleStr,pCname);
pEntity->close();
}
delete pBlockIterator;
pBlockTableRecord->close();
acutPrintf("\n");
} |
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置顶卡
