topic Re: How to start the a Robot Structural application through API in Robot Structural Analysis Forum

How to start the a Robot Structural application through API

HadiMoosavi — Tue, 17 May 2022 16:06:15 GMT

Hi Everyone,

How do we code for starting the application? Apologies if this is a very simple question.

Re: How to start the a Robot Structural application through API

chjpcoi — Wed, 18 May 2022 01:53:59 GMT

Hi @HadiMoosavi

You can access the link below, which has examples and basic steps for beginners

Link: https://forums.autodesk.com/t5/robot-structural-analysis-forum/api-tutorial/td-p/3939601

Have a nice day

Re: How to start the a Robot Structural application through API

HadiMoosavi — Fri, 27 May 2022 14:22:35 GMT

Will do. Thanks.

Re: How to start the a Robot Structural application through API

HadiMoosavi — Fri, 29 Jul 2022 20:12:52 GMT

@chjpcoi , Hello again,

I looked at those locations. But I didn't find an example that launches Robot.

I found an article in Robot API tutorial (see below). But it does not seem to be the right code for launching a new instance of Robot. Could you please advise on this? By the way, I use C#.

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Mon, 14 Jul 2025 11:40:07 GMT

hi @HadiMoosavi

To use API

using RobotOM; // To use API with Robot and a project open IRobotApplication RobApp = new RobotApplication(); bool Visible = RobApp.Visible == -1, IsActive = RobApp.Project.IsActive == -1, Ready = Visible && IsActive; if (Ready){ // do something } RobApp = null; // To open Robot and create a new project RobotApplication RobApp = new RobotApplication(); RobApp.Visible = -1; RobApp.Project.New(IRobotProjectType.I_PT_FRAME_3D);

Best regards

Re: How to start the a Robot Structural application through API

HadiMoosavi — Fri, 29 Jul 2022 21:51:52 GMT

Thank you very much, Stephane.
What do Visible and Active properties are used for?
There is little information in the SDK.

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Sat, 30 Jul 2022 07:40:59 GMT

First state : instance created but robot not showed
Visible: Second state = App displayed to the user.
Project.IsActive: Third state = Project started

Re: How to start the a Robot Structural application through API

HadiMoosavi — Fri, 12 Aug 2022 03:17:21 GMT

@Stephane.kapetanovic
I have another question if you would help.
Manually, I can open two instances of Robot.
Is it possible to open two instances using API?

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Fri, 12 Aug 2022 04:33:11 GMT

hi @HadiMoosavi

I'm not sure I understand precisely, could you detail the reasons for such a request?
If you plan to use two successive function calls (cascade) on same thread, yes it is possible.
At the same time or very close on same server (multithread), it is not safe.
Working on two robot instances at the same time by API is not possible.

Best regards

Re: How to start the a Robot Structural application through API

HadiMoosavi — Fri, 12 Aug 2022 05:30:22 GMT

@Stephane.kapetanovic

I am glad you asked. Here it goes.
I am trying to call RSA from Revit Dynamo in a Generative Design(GD) graph. GD which is some kind of evolutionary algorithm, runs six parallel instances of the graph which means six RSA instances. But based on your answer, it seems it is not possible. Do you have any recommendations?

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Mon, 01 Sep 2025 06:13:38 GMT

@HadiMoosavi

Does your program itself handle synchronization across the six instances? If so, you could protect access to Robot with a lock. If not, it isn’t safe. It also depends on which parts are implemented. Your project is interesting, but what you’re trying to achieve is complex and not really within the scope of this forum, which is focused on the use of Robot software. I’m not saying there are no solutions, but you should carefully review the requirements of such an asynchronous architecture.

Best regards

Re: How to start the a Robot Structural application through API

HadiMoosavi — Thu, 18 Aug 2022 21:48:03 GMT

It does manage the sync between instances. Although, I did not understand the part about protecting with a lock.
Could you expand on this?

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Mon, 01 Sep 2025 06:14:35 GMT

I was referring to a program you developed yourself and over which you have full control, not a third-party application you’re trying to integrate. In your case, it’s not safe.

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/statements/lock

Re: How to start the a Robot Structural application through API

WALIDGIO — Tue, 08 Jul 2025 00:43:29 GMT

Hi, Why my program always ask to run Robot analysis before starting my program that have robot API ?
Is there a solution to this problem, thank you

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Tue, 08 Jul 2025 05:12:51 GMT

hi @WALIDGIO

that’s just how Robot works. There’s no real storage outside the open project, so if the app and project aren’t both running, a bunch of API calls just won’t work.

It’s kind of a built-in safeguard. Most people just add a check at the start of their script to catch that.

Sometimes it shows a message, sometimes it’s silent. You can also delay the check and handle it later in the flow if that makes more sense for your tool.

Some devs even build their own data formats or logic around Robot, so they can split things like, generate stuff first and deal with export later. That way, you are not stuck if Robot is used otherwise or not running permanently.

Excel works great for simple sequential workflows. If the data is more demanding, exporting to formats like plain text, CSV, JSON, XML, or even a database can give you more speed and flexibility.

Best regards

Re: How to start the a Robot Structural application through API

WALIDGIO — Mon, 14 Jul 2025 11:15:34 GMT

Hi @Stephane.kapetanovic,

Thanks for the explanation, that helped clarify things.

Quick question: I’d like my app to start even if Robot isn’t running. Then, later (e.g., on an "Import" button), I want to check if Robot and a project are available and proceed.

I want my C# app to:

Start without requiring Robot
Allow users to launch Robot later
Recheck connection on "Import" without restarting the app

The problem is:
If I launch my app when Robot isn’t running, even setting robotApp = null, or trying robotApp = new RobotApplication() when lunching Robot later doesn’t work. the app still acts like Robot is unavailable unless I restart the app.

Is there a clean way to reset or reinitialize the Robot connection once Robot is launched after the app has started?

Any tip or small example would be really appreciated!

Best,
Walid

Re: How to start the a Robot Structural application through API

Stephane.kapetanovic — Mon, 01 Sep 2025 06:19:16 GMT

hi @WALIDGIO

Start without requiring Robot -> yes but you can't use functions creating objects from servers
Allow users to launch Robot later -> add a "send to robot" button
Recheck connection on "Import" without restarting the app -> 1 2 3 asks to create your own objects and classes

Is there a clean way to reset or reinitialize the Robot connection once Robot is launched after the app has started? ReleaseComObject

Best Regards