#include "ltwrappr.h"

L_INT LAutomation::AddUndoNode(dwFlags);

Manually adds an undo node to the automation object.


L_UINT32 dwFlags

Reserved for future use. Use 0.


Value Meaning
SUCCESS The function was successful.
< 1 An error occurred. Refer to Return Codes.


This function adds an undo node to the automation object. When used with LAutomation::SetUndoEnabled, a lengthy operation, consisting of multiple steps, can be combined into one undo call to LAutomation::Undo. To accomplish this, use the following steps:

  1. Call LAutomation::AddUndoNode to add an undo node to the automation handle.
  2. Disable the undo feature by calling LAutomation::SetUndoEnabled(FALSE).
  3. Perform the operations to be combined into one undo.
  4. Re-enable the undo feature by calling LAutomation::SetUndoEnabled(TRUE).

Required DLLs and Libraries

See Also




This example shows how to group several vector operations into a single undo node.

L_INT LAutomation_AddUndoNodeExample(LAutomation  &Automation) 
   L_INT nRet; 
   // Add an undo node manually  
   nRet = Automation.AddUndoNode(0); 
   if(nRet != SUCCESS) 
      return nRet; 
   // Disable the undo feature */ 
   nRet = Automation.SetUndoEnabled (FALSE); 
   if(nRet != SUCCESS) 
      return nRet; 
   // Do multiple operations on the automation object  
   // Re-enable the undo feature  
   nRet = Automation.SetUndoEnabled(TRUE); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 

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