ARX里我在写扩展记录的时候老是出现C0000005错误,大家帮忙看看..

[fly___fly]

如题,代码如下:

	ads_name entName;
	ads_point pt;
	AcDbObjectId id;

	acedEntSel("选择实体:", entName, pt);
	acdbGetObjectId(id, entName);
	AcDbEntityPointer entPtr(id, AcDb::kForWrite);

	entPtr->createExtensionDictionary();
	id = entPtr->extensionDictionary();

	AcDbDictionaryPointer dictPtr(id, AcDb::kForWrite);
	AcDbXrecord* pXrec = new AcDbXrecord;
	dictPtr->setAt("AA", pXrec, id);

	struct resbuf* pRb = acutBuildList(RTSTR, "abc", RTNONE);
	struct resbuf rb;
	rb.restype = RTSTR;
	rb.resval.rstring = "abc";
	rb.rbnext = NULL;

	pXrec->setFromRbChain(rb);    //83行
	pXrec->close();
	acutRelRb(pRb);

好像是第83行出的问题.可是我看不出来是什么问题.