My DocBlock Data doesn't update programmatically

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Hello !
I have created a DocBlock in my model and i would like to update the content programmatically. I have this code :
DocBlock = find_system('Model', 'SearchDepth', 1, 'Name', 'DocBlock');
DocBlockHandle = getSimulinkBlockHandle(DocBlock);
B = get_param(DocBlockHandle, 'UserData');
B.content = 'Test DocBlock update';
set_param(DocBlockHandle, 'UserData', B, 'UserDataPersistent','On');
save_system('Model');
When i debug, B is updated with the good content but when i run the script and i enter in my DocBlock .txt file it didn't changed i don't understand why.
EDIT : When i change directly the text of the .txt file it saves the changes but still not when i use script
Thank you !

Accepted Answer

omar Elkawokgy
omar Elkawokgy on 6 May 2020
Edited: omar Elkawokgy on 6 May 2020
The problem in DocBlock file that it creates a temp .txt in temp folder, so what you need to do is delete this files before editing programmatically. There is a command in DeleteFcn in callbacks of the DocBlock itself called "docblock('close_document', gcb);". All you need to do is add this line to your code before calling set_param command like so:
DocBlock = find_system('Model', 'SearchDepth', 1, 'Name', 'DocBlock');
DocBlockHandle = getSimulinkBlockHandle(DocBlock);
B = get_param(DocBlockHandle, 'UserData');
B.content = 'Test DocBlock update';
docblock('close_document', DocBlockHandle);
set_param(DocBlockHandle, 'UserData', B, 'UserDataPersistent','On');
save_system('Model');

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