Reverses the last user action that was executed using the automated annotation functions.
#include "l_bitmap.h"
L_LTANN_API L_INT L_AnnUndo(hObject)
Handle to the automation object.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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.)
Win32, x64.
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;
}
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