LISP for Experts

[Anonymous]

Hello friends, I am creating a lisp for a project that some people will work together. I would like to know some things to improve my lisp.

1- Is there a way to prevent you from closing the DWG through LISP?
2- Can I execute a command when I click close (X) the DWG?
3- Is there any variable that is not excluded when closing the DWG? To save information from the current project and retrieve it when reopening the project? I know you can do it by creating a file (exporting data in a file) but does AUTOCAD not have a database of variables that store user information for later reading?
Thanks for the personal help! Any information is very welcome!
(I'm Brazilian and translated by GoogleTranslate, sorry if the grammar was strange)

ORIGINAL:

Olá amigos, estou criando uma lisp para um projeto que algumas pessoas irão trabalhar em conjunto. Gostaria de saber algumas coisas pra melhorar minha lisp.
1- Tem como impedir que feche o DWG através de LISP?
2- Tem como executar comando quando clicar em fechar (X) o DWG?
3- Existe alguma variavel que não se exclui ao fechar o DWG? Para salvar informações do projeto atual e buscá-las ao reabrir o projeto? Sei que dá pra fazer criando arquivo (exportando dados em arquivo) mas o AUTOCAD não possui um banco de variáveis que guardam informação de usuário para leitura posterior?
Obrigado pela ajuda pessoal! Qualquer informação é muito bem vinda!

[pendean]

Do you just need to force a QSAVE so you/your users do not lose their changes?

[Shneuph · Accepted solution]

#s 1 and 2 would involve the use of reactors.  In limited time I can only point you towards some learning materials here:

https://www.afralisp.net/visual-lisp/tutorials/reactors-part-1.php

https://help.autodesk.com/view/ACD/2018/ENU/?guid=GUID-82B7F0D1-02AD-4463-A8A3-BF87EFCC83A4

1- Is there a way to prevent you from closing the DWG through LISP?

2- Can I execute a command when I click close (X) the DWG?

3- Is there any variable that is not excluded when closing the DWG? To save information from the current project and retrieve it when reopening the project? I know you can do it by creating a file (exporting data in a file) but does AUTOCAD not have a database of variables that store user information for later reading?

#3, you can use global variables using the setenv function.  Variables are saved to the registry and thus remain available after closing autocad and re-opening.  Setenv and Getenv functions.

[Anonymous]

Thank you for the precious information!

[Anonymous]

One question: Doesn't using variables in the registry change the performance of the operating system?

[john.uhden · Accepted solution]

Yes, you can by creating a reactor using Visual Lisp.  Of course every user will have to have the Lisp loaded.

As to storing special data in a dwg, you can do that too using dictionaries.  And with vlax-ldata-put and vlax-ldata-get you can even store lists and lists of lists such as entity data dxf codes, your wedding anniversary date, and the definition of "peavey" which is my favorite fictionary word.

Now if you want to store entity data, don't use the ename (dxf -1), because the names change from session to session.  You must use the entity handle instead (dxf 5).

[Anonymous · Accepted solution]

Thank you! I will study more VLX to better understand and apply it to my lisp. About DXF5 I didn't know that there was a permanent name for each object. It will help my development a lot.

[Kent1Cooper · Accepted solution]

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@Anonymous wrote:

....

3- Is there any variable that is not excluded when closing the DWG? To save information from the current project and retrieve it when reopening the project? I know you can do it by creating a file (exporting data in a file) but does AUTOCAD not have a database of variables that store user information for later reading?....

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For that, in the case of numerical  variable information, you can store that in each drawing in a way that is retained -- Real numbers in the USERR1 through USERR5 System Variables, and Integers in the USERI1 through USERI5 System Variables.  [There are also USERS1 through USERS5 System Variables for text Strings, but for some reason those are not  retained when the drawing is closed.]

[Anonymous · Accepted solution]

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