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Flow ControlIntermediate
Use Subflows to Check if File Exists
Robomotion•Updated 9 months ago
Overview
Encapsulates a "does this file exist?" check inside a reusable subflow so the main flow stays linear and readable.
Use Subflows to Check if File Exists
Automating complex scenarios may lead to large flows with recurrent nodes. Subflows are reusable groups of nodes that split flows, making them more manageable and easier to maintain.
What Use Subflows to Check if File Exists can do
- Input Dialog titled
Check if file exists, messagePlease populate a file name to check if it exists in your desktop folder., defaultFileName->msg.user_input. - Branch on cancel (
Core.Programming.Function,outputs: 2) — empty input short-circuits toCore.Flow.Stop. - Build path (
Core.Programming.Function) —msg.candidate_path = global.get('$Home$') + '\Desktop\' + msg.user_input. Core.FileSystem.PathExistsonmsg.candidate_path->msg.exists.- Branch on existence (
Core.Programming.Function,outputs: 2) — routes toCore.Flow.SubFlowCall File_ExistsorCall File_Does_Not_Exist.
Behind the scenes
- The teaching point is subflow routing: instead of an
IF/ELSEwith inline nodes, route to two differently-named subflows. Keep each subflow minimal — they show the difference from the label and IF-based versions of this tutorial. msg.*fields (user_input,candidate_path,exists) ride the message across theCore.Flow.SubFlowcall, so the child flows can read them without any extra wiring.
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