[求助]求助一个关于扩展数据的问题
怎么样把以前添加的扩展数据更新成新的或删除下面是网上找到的清除扩展数据的代码，我看不懂
void delXdata()
{
ads_name eNam;
ads_point pt;
int ret = acedEntSel ("\nselect an object:", eNam, pt);
if ( ret!= RTNORM)
{
return;
}
AcDbObjectId ObjId;
acdbGetObjectId(ObjId, eNam);
AcDbEntity *pEnt;
acdbOpenAcDbEntity(pEnt, ObjId, AcDb::kForWrite);
resbuf *xdata = pEnt->xData(NULL);
if (xdata)
{
xdata->rbnext = NULL;
pEnt->setXData(xdata);
acutRelRb(xdata);
}
pEnt->close();
}
public void delXdata()
{
ads_name eNam;
ads_point pt;
int ret = acedEntSel ("\nselect an object:", eNam, pt); //点选获得一个实体
if ( ret!= RTNORM)
{
return;
}
AcDbObjectId ObjId;
acdbGetObjectId(ObjId, eNam); //获得实体的ID
AcDbEntity *pEnt;
acdbOpenAcDbEntity(pEnt, ObjId, AcDb::kForWrite);//通过ObjectID打开实体来编辑
resbuf *xdata = pEnt->xData(NULL); //获取实体的扩展数据结果缓冲区链表
if (xdata) //如果该扩展数据结果缓冲区链表不为空
{
xdata->rbnext = NULL;//将该结果缓冲区链表的后续指针置为空
pEnt->setXData(xdata); //将该实体的扩展数据设为置为空了的结果缓冲区
acutRelRb(xdata);//释放链表
}
pEnt->close();
}
本想发贴咨询一下在AutoCAD 2007.NET API中，用C＃中如何给实体设置XData扩展属性，现就此贴延续一下了，希望能把XData彻底弄清楚。
在VC60下的XData的添加方法，Autodesk公司的示例文档中有很好的代码：
void
addXdata()
{
AcDbObject* pObj = selectObject(AcDb::kForRead);
if (!pObj) {
acutPrintf("Error selecting object\n");
return;
}
// Get the application name and string to be added to
// xdata.
//
char appName, resString;
appName = resString = '\0';
acedGetString(NULL, "Enter application name: ",
appName);
acedGetString(NULL, "Enter string to be added: ",
resString);
structresbuf*pRb, *pTemp;
pRb = pObj->xData(appName);
if (pRb != NULL) {
// If xdata is present, then walk to the
// end of the list.
//
for (pTemp = pRb; pTemp->rbnext != NULL;
pTemp = pTemp->rbnext)
{ ; }
} else {
// If xdata is not present, register the application
// and add appName to the first resbuf in the list.
// Notice that there is no -3 group as there is in
// AutoLISP. This is ONLY the xdata so
// the -3 xdata-start marker isn't needed.
//
acdbRegApp(appName);
pRb = acutNewRb(AcDb::kDxfRegAppName);
pTemp = pRb;
pTemp->resval.rstring
= (char*) malloc(strlen(appName) + 1);
strcpy(pTemp->resval.rstring, appName);
}
// Add user-specified string to the xdata.
//
pTemp->rbnext = acutNewRb(AcDb::kDxfXdAsciiString);
pTemp = pTemp->rbnext;
pTemp->resval.rstring
= (char*) malloc(strlen(resString) + 1);
strcpy(pTemp->resval.rstring, resString);
// The following code shows the use of upgradeOpen()
// to change the entity from read to write.
//
pObj->upgradeOpen();
pObj->setXData(pRb);
pObj->close();
acutRelRb(pRb);
}
问题是在AutoCAD 2007.NET API下：
网上现有的只是关于Xrecord的示例代码，如下：
public ObjectId createXrecord(string name,string salary,string division)
{
Database db = HostApplicationServices.WorkingDatabase;
Transaction trans = db.TransactionManager.StartTransaction();
try
{
BlockTable bt = (BlockTable)MyT.GetObject(db.BlockTableId, OpenMode.ForWrite, false);
BlockTableRecord br = (BlockTableRecord)MyT.GetObject(bt, OpenMode.ForWrite, false);
//Create the custom per-employee data
Xrecord xRec = new Xrecord();
//We want to add //Name//, //Salary// and //Division// information.Here is how:
xRec.Data = new ResultBuffer(
new TypedValue((int)DxfCode.Text, name),
new TypedValue((int)DxfCode.Real, salary),
new TypedValue((int)DxfCode.Text, division));
//Next, we need to add this data to the //Extension Dictionary// of the employee.
br.CreateExtensionDictionary();
DBDictionary brExtDict = (DBDictionary)trans.GetObject(br.ExtensionDictionary, OpenMode.ForWrite, false);
brExtDict.SetAt("EmployeeData", xRec); //Set our XRecord in the dictionary at //EmployeeData//.
trans.AddNewlyCreatedDBObject(xRec, true);
return xRec.ObjectId;
}
catch
{
return ObjectId.Null;
}
}
但为何添加XData扩展数据就会报错eBadDxfSequence呢？
public void addXData(Entity ent,string name,string salary,string division)
{
Database db = HostApplicationServices.WorkingDatabase;
Transaction MyT = db.TransactionManager.StartTransaction();
try
{
BlockTable bt = (BlockTable)MyT.GetObject(db.BlockTableId, OpenMode.ForWrite, false);
BlockTableRecord btr = (BlockTableRecord)MyT.GetObject(bt, OpenMode.ForWrite, false);
ent.XData = new ResultBuffer();
ent.XData = new ResultBuffer(
new TypedValue((int)DxfCode.Text, name),
new TypedValue((int)DxfCode.Real, salary),
new TypedValue((int)DxfCode.Text, division));
btr.AppendEntity(ent);
MyT.AddNewlyCreatedDBObject(ent, true);
}
catch
{
}
}
后来又试过如下方法：
Autodesk.AutoCAD.DatabaseServices.SymbolUtilityServices.IsRegAppAcadName("name");
pEnt.XData = new ResultBuffer(new TypedValue((int)DxfCode.ExtendedDataRegAppName,"name"));
pEnt.XData.Add(new TypedValue((int)DxfCode.ExtendedDataControlString, "this is a test!"));
也报错……为eRegappIdNotFound，应该是因为未注册应用程序名的原因，
求教全局函数acdbRegApp(appName)在C＃中的对应方法！！
public void AddXData()
{
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("添加扩充数据XDATA\n");
PromptEntityOptions entOps = new PromptEntityOptions("选择要打开的对象\n");
PromptEntityResult entRes;
entRes = ed.GetEntity(entOps);
if (entRes.Status != PromptStatus.OK)
{
ed.WriteMessage("选择对象失败，退出");
return;
}
ObjectId objId = entRes.ObjectId;
Database db = HostApplicationServices.WorkingDatabase;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
Entity ent = trans.GetObject(objId, OpenMode.ForWrite) as Entity ;
ent.ColorIndex = 1;
RegAppTable appTbl = trans.GetObject(db.RegAppTableId, OpenMode.ForWrite) as RegAppTable ;
if (!appTbl.Has("MyAppName"))
{
RegAppTableRecord appTblRcd = new RegAppTableRecord();
appTblRcd.Name = "MyAppName";
appTbl.Add(appTblRcd);
trans.AddNewlyCreatedDBObject(appTblRcd, true);
}
ResultBuffer resBuf = new ResultBuffer();//new TypedValue(1001, "MyAppName"), new TypedValue(1000, "开发部门"));
resBuf.Add(new TypedValue(1001, "MyAppName"));//注册程序名称
resBuf.Add(new TypedValue(1000 , " Hongxian Qin"));//姓名
resBuf.Add(new TypedValue(1000 , " 工程部"));//部门
resBuf.Add(new TypedValue(1040, 2000.0));//薪水
ent.XData =resBuf;
trans.Commit();
}
}
public void GETXDATA()
{
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
ed.WriteMessage("获取扩充数据XDATA\n");
PromptEntityOptions entOps = new PromptEntityOptions("选择要打开的对象");
PromptEntityResult entRes = ed.GetEntity(pr);
if (entRes.Status != PromptStatus.OK)
{
ed.WriteMessage("选择对象失败，退出");
return;
}
Database db = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Database;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
Entity ent = (Entity)tr.GetObject(res.ObjectId, OpenMode.ForRead);
ResultBuffer resBuf = ent.XData;
if (rb != null)
{
//
IEnumerator iter = resBuf.GetEnumerator();
while (iter.MoveNext())
{
TypedValue tmpVal = (TypedValue)iter.Current;
ed.WriteMessage(tmpVal.TypeCode.ToString() + ":");
ed.WriteMessage(tmpVal.Value.ToString() + "\n");
}
}
}
}
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