How to Set "Undo/Redo" by API code?

[Anonymous]

How to Set Undo/Redo by API code?....Thank u.

[Ralph Wessel]

Traro wrote:
How to Set Undo/Redo by API code?....Thank u.

Call ACAPI_OpenUndoableSession to start the session and ACAPI_CloseUndoableSession to end it. These functions are mandatory if you need to make changes to the project data.

[Anonymous]

Ralph wrote:

Traro wrote:
How to Set Undo/Redo by API code?....Thank u.

Call ACAPI_OpenUndoableSession to start the session and ACAPI_CloseUndoableSession to end it. These functions are mandatory if you need to make changes to the project data.

thank u., but After I call

GSErrCode err;

err = ACAPI_OpenUndoableSession ("Element Test1");
//to make changes to the project data
ACAPI_CloseUndoableSession();

err = ACAPI_OpenUndoableSession ("Element Test2");
//to make changes to the project data
ACAPI_CloseUndoableSession();

err = ACAPI_OpenUndoableSession ("Element Test3");
//to make changes to the project data
ACAPI_CloseUndoableSession();



and, while I want to run back to session("Element Test2").
What can I do with API Function?

[Ralph Wessel]

Traro wrote:
thank u., but After I call
err = ACAPI_OpenUndoableSession ("Element Test1");
err = ACAPI_OpenUndoableSession ("Element Test2");
err = ACAPI_OpenUndoableSession ("Element Test3");
and, while I want to run back to session("Element Test2").
What can I do with API Function?

The 'undo' mechanisms are purely for the user's benefit, so the user could roll back 'test 2' by selecting Edit > Undo twice. I'm not aware of any way to do this through the API (other than keeping your own transaction log and rolling back as required).