Undo/Redo freeze

Hello Author,
By default Undo is disabled.
Enabling it will take effect with the next call to NewCommand.
See documentation of TDocStd_Document class.
Regards
Commenter-1

Hello Sregey,

thanks for your answer. I enabled undo by setting the undolimit and calling new command, but still no progress, it never returns from the newcommand() function. here my code and it's behaviour as comments:

Handle_TDocStd_Document doc;
Handle(OcafApp) app = new OcafApp();
app->NewDocument ( "MDTV-Standard", doc );

//this code gets executet, no problems here
doc->SetUndoLimit(100);

//calling this function should activate the undo mechanism
doc->NewCommand();
//it never get here. doc->NewCommand() never returns, no error's or exeptions. Only killing the application helps

Any further ideas?

Greedings,
Author

Hello Author,
I checked your code with few modifications:
Handle(TDocStd_Document) doc;
Handle(AppStd_Application) app = new AppStd_Application();
app->NewDocument ( "MDTV-Standard", doc );

//this code gets executet, no problems here
if(doc.IsNull()) return 1;
doc->SetUndoLimit(100);

//calling this function should activate the undo mechanism
doc->NewCommand();
cout << "New Command1 is opened" <Main(), 171);
doc->NewCommand();
cout << "New Command2 is opened: val = " << att->Get() <

Hello Sergey,

your code works, thanks for posting. Seems that the problem lies within my overloaded TDocStd_Application. I thought it is necesarry to create one's one class to overrite the Formats() and ResourceName() functions, never before read about AppStd_Application(). If I intend to use only the standart format, can i use this application or are there any limitations?

Again, thank you for your help, you safed me hours and hours of frustrating testing.

Greetings,
Author

Hello Author,
You can use it (AppStdL_Application or AppStd_Application if you need geometry ) or you may create your own inheriting from TDocStd_Application (consider AppStdL_Application as prototype).
Regards