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ReaScript Video Tutorial — Part. 9: Preventing Bugs

This entry is part of the serie ReaScript for Beginners

  1. ReaScript Basics — Interview on REAPER blog / Part-1
  2. ReaScript Basics — Interview on REAPER blog / Part-2
  3. How to Learn ReaScript for REAPER
  4. Useful Tools for REAPER Scripters
  5. ReaScript: What can we Expect from v5 Pre-Releases?
  6. Advanced Actions Management: Import and Export Toolbars Buttons linked to Scripts, Change Script Path and Name
  7. Scripting for REAPER: General Guidelines
  8. ReaScript Video Tutorial — Part. 1: The Console Output
  9. ReaScript Video Tutorial — Part. 2: The Api Documentation
  10. ReaScript Video Tutorial — Part. 3: Get/Set First Selected Item Properties
  11. ReaScript Video Tutorial — Part. 4: Loop in Selected Items
  12. ReaScript Video Tutorial — Part. 5: Conditions Basics
  13. ReaScript Video Tutorial — Part. 6: Time Selection
  14. ReaScript Video Tutorial — Part. 7: Loop in Items on Selected Tracks
  15. ReaScript Video Tutorial — Part. 8: Using Native Actions
  16. ReaScript Video Tutorial — Part. 9: Preventing Bugs
  17. ReaScripts Templates Repository on GitHub

Scripts are powerful. But as Cockos developer’s Jeffos reminds me when I started:

With great power comes great responsibility

Uncle Ben, Spiderman

What you will learn in this lesson is very important, for all people who make scripts for REAPER.

In this video, you will see:

  • that scripts can set invalid values to a project
  • how to correct these invalid values
  • how to set new values, being sure that they are balid

It is not as complicated as it sounds: it is just basic conditions. Basic, but important!

Code Snippet:

-- A function to set an Item Fade-Out Length in security.
function SetItemFadeOut(item, item_len, fade_out_len)

	fade_in_len = reaper.GetMediaItemInfo_Value(item, "D_FADEINLEN")
	
	max_value = item_len - fade_in_len
	
	if fade_out_len > max_value then
		fade_out_len = max_value
	end
	
	--[[ Optionnal
	if fade_out_len < 0
		fade_out_len = 0
	end
	]]

	reaper.SetMediaItemInfo_Value(item, "D_FADEOUTLEN", fade_out_len)

end

Next videos will show you how and why using tables in ReaScript.

Help us translate the subtitles of this video in your language using Amara.org !

Series Navigation

← ReaScript Video Tutorial — Part. 8: Using Native Actions

ReaScripts Templates Repository on GitHub →