L_AnnUndo

#include "l_bitmap.h"

/* handle to the automation object */

Reverses the last user action that was executed using the automated annotation functions. This function is available in the Document/Medical Toolkits.

Parameter	Description
hObject	Handle to the automation object.

Returns

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

LTANN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Windows 95 / 98 / Me, Windows 2000 / XP.

See Also

Functions:	L_AnnCreate, L_AnnSetAutoContainer, L_AnnGetAutoContainer, L_AnnSetDpiX, L_AnnSetDpiY, L_AnnGetDpiX, L_AnnGetDpiY, L_AnnSetTool, L_AnnGetTool, L_AnnGetUserMode, L_AnnSetUserMode, L_AnnSetUndoDepth, L_AnnAddUndoNode, L_AnnGetAutoUndoEnable, L_AnnSetAutoUndoEnable
Topics:	Annotation Functions: Working with the Toolbar
	Implementing Annotations
	Automated User Interface for Annotations
	Implementing an Automated Annotation Program

Example

/* This example reverses the last user action in automation mode. */
HANNOBJECT hAutoObject; /* Automation object */
void TestAnnUndo(void)
{
   L_UINT uUndoLevels;
   L_AnnGetUndoDepth(hAutoObject, &uUndoLevels, NULL);
   if(uUndoLevels)
      L_AnnUndo(hAutoObject);
   else
      MessageBox(NULL, TEXT("No undo operation possible!"), TEXT("Undo"), MB_OK);
   return;
}