How to use a reactor to prevent CAD's modify command?

[lhydmr]

Hi,all

        I want to use a reactor(AcDbObjectReactor?) to prevent user from modifying the entities which I created,such as move,copy,del,and so on. In the openForModify call-back,and the modified() method,what command shoule I add? or any other method I should write?

thanks a lot~

[Alexander.Rivilis]

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@artc2 wrote:

Unfortunately, there is no elegant solution to dealing with preventing editing of objects.  All of the ways to do it have their drawbacks.  You just have to decide which is the least problematic for each particular situation.

i wish I had a better answer, but I don't.  😞

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Thanks for the honest answer!

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@lhydmr wrote:

A good idea,But,a locked layer can be easily unlocked,How to prevent this layer from unlocking?

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You can check status of this layer in AcApDocManagerReactor::documentLockModeChanged reactor and if layer is unlocked then lock it.

I hope that Art did not say that it is unacceptable. 🙂

[owenwengerd]

If locked layers are not suitable for you, then reactors will not be suitable either (because they can be unloaded). Perhaps you should consider securing your content with CADVault instead.

[lhydmr]

In the documentLockModeChanged function,I can't operate the layer,Maybe documentLockModeChanged is just used for document ,not for layer! Is there a function for layer manager in reactor?

examper:

void CCmdAcApDocManagerReactor::documentLockModeChanged(AcApDocument* unnamed,AcAp::DocLockMode myPreviousMode,
      AcAp::DocLockMode myCurrentMode,AcAp::DocLockMode currentMode,
      const char* pGlobalCmdName)
{
 AfxMessageBox("1");
 const char* layerName ;
 layerName = "LockedLayer";
 //CCreatElement *OBJ = new CCreatElement;
 //layerName = OBJ->NlayerName;

 // 获得当前图形的层表
 AcDbLayerTable *pLayerTbl;
 acdbHostApplicationServices()->workingDatabase() ->getLayerTable(pLayerTbl, AcDb::kForRead);
 AfxMessageBox("2");

 // 判断是否包含指定名称的层表记录
 if (!pLayerTbl->has(layerName))
 {
  AfxMessageBox("21");
  pLayerTbl->close();
  return;
 }
 AfxMessageBox("3");
 AcAxDocLock DocLock;

 // 获得指定层表记录的指针
 AcDbLayerTableRecord *pLayerTblRcd;
 pLayerTbl->getAt(layerName, pLayerTblRcd, AcDb::kForWrite);
 AfxMessageBox("4");
 //将图层锁定
 if (pLayerTblRcd->isLocked() == false)
 {
  AfxMessageBox("图层锁定");
  pLayerTblRcd->setIsLocked(true);
 }
 AfxMessageBox("5");

 pLayerTblRcd->close();
 pLayerTbl->close();
}

Between  AfxMessageBox("3") and AfxMessageBox("4") ,the function will be error!

[Alexander.Rivilis]

1. Remove line with:

AcAxDocLock DocLock;

2. Replace acdbHostApplicationServices()->workingDatabase() with unnamed->database()

3. Check code of error.

[lhydmr]

Ask for help:

       In the AcApDocManagerReactor, I can't operate the layer for AcDb::kForWrite,There will be an error between AfxMessageBox("please lock the layer"); and  AfxMessageBox("lock successful");

void CCmdAcApDocManagerReactor::documentLockModeChanged(AcApDocument* unnamed,AcAp::DocLockMode myPreviousMode,
      AcAp::DocLockMode myCurrentMode,AcAp::DocLockMode currentMode,
      const char* pGlobalCmdName)
{
 Acad::ErrorStatus es;

 const char* layerName;
 layerName = "LockedLayer";

 AcDbLayerTable *pLayerTbl;
 unnamed->database() ->getLayerTable(pLayerTbl,AcDb::kForRead);

 if (!pLayerTbl->has(layerName))
 {
  pLayerTbl->close();
  return;
 }
 else
 {
  AcDbLayerTableRecord *pLayerTblRcd;
  if ((es = pLayerTbl->getAt(layerName, pLayerTblRcd, AcDb::kForRead , false))!= Acad::eOk)
  {
   CString str;
   str.Format(_T("The reason for error：%s"),acadErrorStatusText(es));
   AfxMessageBox(str);
   pLayerTblRcd->close();
   pLayerTbl->close();
   return;
  }
  else if ((pLayerTblRcd->isLocked())!=true)
  {
   AfxMessageBox("please lock the layer");
   pLayerTbl->getAt(layerName, pLayerTblRcd, AcDb::kForWrite , false); 
   pLayerTblRcd->setIsLocked(true);
   AfxMessageBox("lock successful");
  }
  pLayerTblRcd->close();
 }
 pLayerTbl->close();
}

[Balaji_Ram]

Hi,

Here is an alternate approach that you may try.

Refere to the Step 7 example of the ObjectARX training material :

http://usa.autodesk.com/adsk/servlet/index?id=1911627&siteID=123112

To prevent the entity from being moved, the sample code in that example resets the original position after the "commandended".

[Balaji_Ram]

Sorry, I replied to Alex.

My previous reply was meant for "lhydmr"

[Alexander.Rivilis]

Change lines:

AfxMessageBox("please lock the layer");
pLayerTbl->getAt(layerName, pLayerTblRcd, AcDb::kForWrite , false); 
pLayerTblRcd->setIsLocked(true);
AfxMessageBox("lock successful");

 with:

AfxMessageBox("please lock the layer");
pLayerTblRcd->upgradeOpen(); // <-- !!!!
pLayerTblRcd->setIsLocked(true);
AfxMessageBox("lock successful");

[lhydmr]

pLayerTblRcd->upgradeOpen(); // <-- !!!!

I've tried this way,but,In the AcApDocManagerReactor,This operation  is failure, It's return value is unnormal~Any other ideas?

[lhydmr]

Thanks,I will try it~

[Alexander.Rivilis]

This code was tested with AutoCAD 2013 but it have to work also with previous AutoCAD versions. It prevent layer with name in global variable layerName from unlocking by user:

void LockLayerReactor::documentLockModeChanged(AcApDocument * param2, 
  AcAp::DocLockMode myPreviousMode, AcAp::DocLockMode myCurrentMode, 
  AcAp::DocLockMode currentMode, const ACHAR * pGlobalCmdName)
{
  Acad::ErrorStatus es;
  AcApDocManagerReactor::documentLockModeChanged(param2, 
      myPreviousMode, myCurrentMode, currentMode, pGlobalCmdName) ;
  if (!(currentMode & AcAp::kNotLocked)) { // Check the possibility of modifying
    AcDbLayerTableRecordPointer pLayer(layerName,param2->database(),AcDb::kForRead);
    if ((es = pLayer.openStatus()) != Acad::eOk) {
      if (es != Acad::eKeyNotFound) {
         acutPrintf(_T("Error open layer: %s"), acadErrorStatusText(es));
      }
      return;
    }
    if (!pLayer->isLocked()) {
      if ((es = pLayer->upgradeOpen()) != Acad::eOk) {
        acutPrintf(_T("Error upgradeOpen layer: %s"), acadErrorStatusText(es));
        return;
      }
      pLayer->setIsLocked(true);
    }
  }
}

But this code can not disable changing entity layer...

[lhydmr]

       Thanks to Alexander.Rivilis.

       It  is Really a good way,At the same time,I really appreciate your enthusiasm to help and answer.

       I test your code in the version of  AUTOCAD2005,this way is correct, and indeed can lock my layer. But,there is a little dissatisfied with this way,If I click on the copy or move command and so on, the layer will be locked automatically,But,If I unlock that layer, then immediately use the mouse to drag the entity which is in the layer,the entity will be draged in this time,then the layer will be locked.

        I know the reason is that you used the if statement:if (!(currentMode & AcAp::kNotLocked)),when I use the mouse to drag the entity,The program did not enter the judgment statement in this time. so the layer will not be locked automatically in this time.

        As I did not use this if statement, this sentence "pLayer->upgradeOpen()" can't pass!

        Anyway, this is a good way, I will use this method.

[Alexander.Rivilis]

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@lhydmr wrote:
... I test your code in the version of  AUTOCAD2005,this way is correct, and indeed can lock my layer...

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Oh! AutoCAD 2005 now is a rarity.

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lhydmr wrote:

        Anyway, this is a good way, I will use this method.

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So we can think that solution was found?

[lhydmr]

        Sorry,I have no good way to solve this problem, and now I'm doing some tests, if there is a good way, I will sent method to the forum.

[lhydmr]

Balaji_Ram recommanded this method:

 Refere to the Step 7 example of the ObjectARX training material : http://usa.autodesk.com/adsk/servlet/index?id=1911627&siteID=123112

To be demonstrated,It is a good way to solve this problem,Use the AcDbObjectReactor,In the openForModify(),we get the object Id which will be modifyed,Then we use the AcEditorReactor,In the commandEnded(),we reopen the object by the objectId,and in the commandEnded(),we can open the entity for write,while we can't do this in the function of AcDbObjectReactor.In the commandEnded(),we can set the entity to the original state.

[Alexander.Rivilis]

There are many ways to change the entities when commandEnded not fired. For example, OPM (Properties palette) or lisp function and so on.