How to save a structure instance (inside module) in JLD2, to load it later correctly?

JonasIsensee · March 24, 2022, 10:50am

A working answer should already be here:

Warning: type does not exist in workspace; reconstructing

opened 01:33AM - 22 Mar 22 UTC

closed 08:36AM - 15 Oct 22 UTC

I was using the below code to create .jld2 file containing an instance Sim of st…ructure Simulation ```julia include("./SimulationStructure.jl"); function appFunction() Sim = Simulation(); io = open("$(@__DIR__)/generatedElements.jld2", "w") close(io) save("$(@__DIR__)/generatedElements.jld2", "Sim", Sim, "Simulation", Simulation) end appFunction(); ``` in which SimulationStructure.jl: ```julia using base export Simulation Base.@kwdef mutable struct Simulation dt::Float64 = 1e-6 tmax::Float64 = 32*1e-3 end ``` Then, I was reading the created .jld2 by the below code called readFile.jl. and It was working without any warning, in which typeof Sim is Simulation ```julia include("./SimulationStructure.jl"); Sim, Simulation = load("$(@__DIR__)/generatedElements.jld2", "Sim", "Simulation"); julia> typeof(Sim) Simulation ``` Now, I have built executable for appFunction() as below and it works fine to generate the .jld2 file. ```julia module readApp Base.@ccallable function julia_main()::Cint try appFunction() catch Base.invokelatest(Base.display_error, Base.catch_stack()) return 1 end return 0 end Base.@kwdef mutable struct Simulation dt::Float64 = 1e-6 tmax::Float64 = 32*1e-3 end function appFunction() Sim = Simulation(); save("$(@__DIR__)/generatedElements.jld2", "Sim", Sim, "Simulation", Simulation) end end ``` However, calling readFile.jl to read the generated .jld2 gives this warning and typeof Sim is Simulation ```julia ┌ Warning: type readApp.Simulation does not exist in workspace; reconstructing └ @ JLD2 C:\Users\amroa\.julia\packages\JLD2\k9Gt0\src\data\reconstructing_datatypes.jl:461 julia> typeof(Sim) JLD2.ReconstructedTypes.var"##readApp.Simulation#292" julia> Simulation JLD2.UnknownType{String}("testtest.Simulation", #undef) ``` How can I get ride of the warning and fix the typeof(Sim) to be of Simula JLD2 to be of Simulation?tion?

also:

@Amro: please avoid double posting (at least add cross references) to reduce confusion and double work from people trying to help.