[Connect | V8] [C# | C++ SDK] Finding Xattributes quickly and selectively, without the detour via "search element"?

We use this to find all the elements with a particular xattributeID.

ScanCriteria                *pScanCriteria = NULL;
            ScanArgs                    scanArgs;
            DgnModelRefP modelRef = ISessionMgr::GetActiveDgnModelP();
            
            memset(&scanArgs, 0, sizeof(scanArgs));

            if (NULL != (pScanCriteria = mdlScanCriteria_create()))
            {
               scanArgs.modelRef = modelRef;
               
               mdlScanCriteria_setReturnType(pScanCriteria, MSSCANCRIT_ITERATE_ELMREF, FALSE, FALSE);
              
               XAttributeHandlerId id = XAttributeHandlerId(XYZID, 0); //need to use your details here...
               mdlScanCriteria_setXAttributeTest(pScanCriteria, &id, XAttributeHandle::MATCH_ANY_ID, NULL);
               scanArgs.id = id;
               mdlScanCriteria_setElemRefCallback(pScanCriteria, (PFScanElemRefCallback)getElementScanCallback, &scanArgs);

               mdlScanCriteria_setModel(pScanCriteria, modelRef);

               mdlScanCriteria_scan(pScanCriteria, NULL, NULL, NULL);
               mdlScanCriteria_free(pScanCriteria);
            }

Then your iterator callback will get each of the elements that meet the xattribute id.  I know it does not avoid the scan thing but is has bee quick enough for us.

HTH,

marka

Hi Mark,

nice to hear from you again :-)

I tried this mdlScanCriteria_setXAttributeTest() yesterday (Thanks to Jan) but I did not get it linked.

"xattributes.obj : error LNK2019: unresolved external symbol "int __cdecl mdlScanCriteria_setXAttributeTest(struct scanCriteria *,struct Bentley::Ustn::Element::XAttributeHandlerId *,unsigned int,struct ExtendedAttrBuf *)" (?mdlScanCriteria_setXAttributeTest@@YAHPAUscanCriteria@@PAUXAttributeHandlerId@Element@Ustn@Bentley@@IPAUExtendedAttrBuf@@@Z) referenced in function _FunktionName"

I tried with SDK MicroStation 08.11.07.171, 08.11.09.459 and AECOsim 08.11.09.750.

I did some investigations, the function is mention in "mdlbltin.lib" but not as expected in some dll like "stdmdlbltin.dll" where the other "mdlScanCriteria_set...Test()" functions are defined.

How did you, or @Yongan.Fu get access to this function?

Here is my (do nothing) snippet, just to verify mdlScanCriteria_setXAttributeTest() could linked. I placed it in an existing project, which uses mdlScanCriteria_set... funktions.

#if defined (vp_vohu)
// vohu KLAMMER Scan Test 

Public int mdlScanCriteria_setXAttributeTest
(
   ScanCriteriaP scP,
   struct Bentley::Ustn::Element::XAttributeHandlerId* handlerId, // Pass NULL to clear
   UInt32 attrId, // Pass XAttributeHandle::MATCH_ANY_ID for any.
   ExtendedAttrBuf* xattrBuf // Can be NULL
);

DLLEXPORT Int32 FunktionName()
{
   XAttributeHandlerId h_XAttrID(AB_Date_ID, 12);
   Int32  nRetErfolg = mdlScanCriteria_setXAttributeTest(NULL, &h_XAttrID, XAttributeHandle::MATCH_ANY_ID, NULL);
   return (nRetErfolg);
}

#endif

The function is exported from mdlbltin.lib but there is not definition in the header files.  You will have to create your own like we did.  Here is the definition that should work for V8i:

Public int mdlScanCriteria_setXAttributeTest
(
ScanCriteriaP scP,
void* handlerId, // Pass NULL to clear
UInt32 attrId, // Pass XAttributeHandle::MATCH_ANY_ID for any.
ExtendedAttrBuf* xattrBuf // Can be NULL
);

HTH,

marka

Hello Mark Anderson,

I shout Heureka!

During my experimenting with the second - different from Yongan.Fu's prototype -   parameter in my declaration I stumped over extern "C" and suddenly with: extern "C" Public int mdlScanCriteria_setXAttributeTest(...) both versions linked.

I guess I have overseen extern "C", because it is normally allover a header-file.

Thank all of you so much!

Volker

Hello Mark Anderson,

I shout Heureka!

During my experimenting with the second - different from Yongan.Fu's prototype -   parameter in my declaration I stumped over extern "C" and suddenly with: extern "C" Public int mdlScanCriteria_setXAttributeTest(...) both versions linked.

I guess I have overseen extern "C", because it is normally allover a header-file.

Thank all of you so much!

Volker

Yes, that is one of those things that we end up not thinking about it become just background stuff.  Glad this helped.

marka