#include "ltaut.h"

L_LTAUT_API L_INT L_AutUndo(pAutomation, dwFlags)

Undoes the last automation operation performed in the active automation container.



Pointer to an automation handle.

L_UINT32 dwFlags

Reserved for future use. Must be 0.


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


L_AutUndo must be called at least once in order to perform a "redo" using L_AutRedo.

To determine the current undo level call L_AutGetUndoLevel.

To change the undo level call L_AutSetUndoLevel.

To determine whether an automation operation can be undone, call L_AutCanUndo.

For information about grouping multiple operations into a single undo process, refer to L_AutAddUndoNode.

Required DLLs and Libraries

See Also




This example shows how to undo the last automation operation.

L_INT AutUndoExample(pAUTOMATIONHANDLE pAutomation) 
   L_INT nRet; 
   nRet = L_AutIsValid ( pAutomation ); 
   if(nRet != SUCCESS) 
      return nRet; 
   if ( nRet == SUCCESS  ) /* check the validity of the automation handle */ 
      L_BOOL fCanUndo ; 
      /* Query the ability of undoing */ 
      nRet = L_AutCanUndo ( pAutomation, &fCanUndo ) ; 
      if(nRet != SUCCESS) 
         return nRet; 
      if ( fCanUndo ) 
         /* undo the last automation operation */ 
         nRet = L_AutUndo ( pAutomation, 0 ) ; 
         if(nRet != SUCCESS) 
            return nRet; 
      return nRet ; 
   return SUCCESS ; 

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