【转帖】[求助]求助一个关于扩展数据的问题
 

[求助]求助一个关于扩展数据的问题
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[求助]求助一个关于扩展数据的问题
怎么样把以前添加的autocad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 , resstring[;
appname[0] = resstring[0] = '\0';

acedgetstring(null, "enter application name: ",
appname);
acedgetstring(null, "enter string to be added: ",
resstring);


struct resbuf *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 , 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[blocktablerecord.modelspace], 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,
[commandmethod("getxdata")]
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");
}
}
}
}
简单的活着