acedSSGet :KacedSSGet选择图元时使用关键词

革天明

This method allow a custom code to be executed when the user selects a keyword, which allow us include some additional keywords.

On the sample below, when acedSSGet() is called in a custom command, the user is able to use two new keywords: LInes to select all lines in the current drawing and CIRcles to select all circles. The callback function uses all possible return values.

First, check below the custom command, that register for the call back.

void MyCustomCommand()

{

  // save the old callback function

  resbuf* (*oldFunc) (const ACHAR*);

  acedSSGetKwordCallbackPtr(&oldFunc);

  // set own callback function

  acedSSSetKwordCallbackPtr(ssCallback);

  // let the user make a selection

  ads_name ss;

  // this is the keyword list

  // to use local and global keywords:

  ACHAR kwordlist[] = { _T("LInes CIRcles _ LInes CIRcles") };

  if (RTNORM != acedSSGet(_T("_:K"), NULL, kwordlist, NULL, ss)) {

    // cancel

  } else {

    acutPrintf(_T("\nDone."));

    acedSSFree(ss);

  }

  // restore old callback function

  acedSSSetKwordCallbackPtr(*oldFunc);

}

Now the callback that is executed when the keyword is selected:

// Callback function for acedSSGet()

resbuf* ssCallback(const TCHAR* kword)

{

  // kword contains the global keyword

  acutPrintf(_T("\nCallback: '%s'"), kword);

  // result to return

  // NULL: no changes on selection set

  resbuf *result = NULL;

  if (!wcscmp(kword, _T("LInes"))) {

    // select all lines (just for testing)

    AcDbObjectIdArray objIds;

    getLines(objIds);

    // create resbuf containing single

    // enames from object id array

    result = getResbuf(objIds);

  } else if (!wcscmp(kword, _T("CIRcles"))) {

    // select all circles (just for testing)

    AcDbObjectIdArray objIds;

    getCircles(objIds);

    // create resbuf containing a selection set

    ads_name ss;

    acedSSGet(_T("X"), NULL, NULL,

      acutBuildList(RTDXF0, _T("CIRCLE"), RTNONE),

      ss);

    result = acutBuildList(RTPICKS, ss, RTNONE);

  } else {

    // return an error message

    result = acutBuildList(RTSTR, _T("\nUnknown error"), RTNONE);

  }

  return result;

}

And finally some additional methods for this specific sample:

resbuf* getResbuf(AcDbObjectIdArray ids)

{

  resbuf *result = NULL, *temp1, *temp2;

  ads_name ename;

  int length = ids.length();

  for (int i = 0; i < length; ++i) {

    acdbGetAdsName(ename, ids);

    temp2 = acutBuildList(RTENAME, ename, RTNONE);

    if (result == NULL) {

      result = temp2;

    } else {

      temp1->rbnext = temp2;

    }

    temp1 = temp2;

  }

  return result;

}

void getLines(AcDbObjectIdArray& ids)

{

  // select all lines from model space

  // (without any error checking)

  AcDbBlockTable *pTable;

  AcDbBlockTableRecord *pModelSpace;

  AcDbBlockTableRecordIterator *pIter;

  AcDbEntity* pEnt;

  acdbHostApplicationServices()->workingDatabase()->

    getBlockTable(pTable, AcDb::kForRead);

  pTable->getAt(ACDB_MODEL_SPACE, pModelSpace, AcDb::kForRead);

  pTable->close();

  pModelSpace->newIterator(pIter);

  pModelSpace->close();

  for (; !pIter->done(); pIter->step()) {

    pIter->getEntity(pEnt, AcDb::kForRead);

    if (pEnt->isKindOf(AcDbLine::desc()))

      ids.append(pEnt->objectId());

    pEnt->close();

  }

  delete pIter;

}

void getCircles(AcDbObjectIdArray& ids)

{

  // select all circles from model space

  // (without any error checking)

  AcDbBlockTable *pTable;

  AcDbBlockTableRecord *pModelSpace;

  AcDbBlockTableRecordIterator *pIter;

  AcDbEntity* pEnt;

  acdbHostApplicationServices()->workingDatabase()->

    getBlockTable(pTable, AcDb::kForRead);

  pTable->getAt(ACDB_MODEL_SPACE, pModelSpace, AcDb::kForRead);

  pTable->close();

  pModelSpace->newIterator(pIter);

  pModelSpace->close();

  for (; !pIter->done(); pIter->step()) {

    pIter->getEntity(pEnt, AcDb::kForRead);

    if (pEnt->isKindOf(AcDbCircle::desc()))

      ids.append(pEnt->objectId());

    pEnt->close();

  }

  delete pIter;

}

以上为ObjectARX示例的acedSSGet使用K模式的示例，

void MyCustomCommand()

{

  // save the old callback function

  resbuf* (*oldFunc) (const ACHAR*);

  acedSSGetKwordCallbackPtr(&oldFunc);

  // set own callback function

  acedSSSetKwordCallbackPtr(ssCallback);

  // let the user make a selection

  ads_name ss;

  // this is the keyword list

  // to use local and global keywords:

  ACHAR kwordlist[] = { _T("LInes CIRcles _ LInes CIRcles") };

  if (RTNORM != acedSSGet(_T("_:K"), NULL, kwordlist, NULL, ss)) {

    // cancel

  } else {

    acutPrintf(_T("\nDone."));

    acedSSFree(ss);

  }

  // restore old callback function

  acedSSSetKwordCallbackPtr(*oldFunc);

}

现在想知道，当选择时不输入关键词，而是正常选择图元后，如何获取选择集ss？若输入了关键词，如LInes，ssCallback中的

AcDbObjectIdArray objIds;

    getLines(objIds);

    // create resbuf containing single

    // enames from object id array

    result = getResbuf(objIds);

返回值result从哪里可以获取到？

正常情况下acedSSGet获取到选择集后，都是要对选择集进行处理的，请问选择集处理相关部分代码应该加在哪里？

zhystar

谢谢分享，尝试一下

edata

if (RTNORM != acedSSGet(_T("_:K"), NULL, kwordlist, NULL, ss)) {
    // cancel
  } else {
    acutPrintf(_T("\nDone."));
//无论是否使用关键字,这里返回ss的就是结果的选择集
//这个关键字的例子类似添加过滤,
    acedSSFree(ss);
  }

革天明

edata 发表于 2019-7-14 15:22
if (RTNORM != acedSSGet(_T("_:K"), NULL, kwordlist, NULL, ss)) {
    // cancel
  } else {

谢谢，我试试