L_AnnUndo

Summary

Reverses the last user action that was executed using the automated annotation functions.

Syntax

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnUndo(hObject)

Parameters

HANNOBJECT hObject

Handle to the automation object.

Returns

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

Comments

This function can be used repeatedly to reverse the number of actions specified by the L_AnnSetUndoDepth function. When the stack is empty, it returns an error.

There is only one undo depth value per root container. (Subcontainers do not have their own separate values.)

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

This example reverses the last user action in automation mode. 

L_INT AnnUndoExample(HANNOBJECT hAutoObject /* Automation object */) 
{ 
   L_INT    nRet; 
   L_UINT   uUndoLevels; 
 
   nRet = L_AnnGetUndoDepth(hAutoObject, &uUndoLevels, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   if (uUndoLevels) 
   { 
      nRet = L_AnnUndo(hAutoObject); 
      if (nRet != SUCCESS) 
         return nRet; 
   } 
   else 
      _tprintf(_T("%s"), TEXT("No undo operation possible!")); 
 
   return SUCCESS; 
}

Help Version 22.0.2023.7.11
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