Suppose we have the following structs matching some structs in a C header: struct Foo a::UInt32 b::Cstring end struct Bar a::UInt32 b::Ptr{Foo} end And we have a function that takes a ptr to Bar. ccall will handle one conversion (from Bar to a Bar pointer) for us, and writing a fu…

[image] cshenton: What’s the idiomatic way to create a pointer to a Foo , since pointer_from_objref should not be called on immutables? fooref = Ref(foo_object) GC.@preserve fooref begin ptr = Base.unsafe_convert(Ptr{Foo}, fooref) ....some code using ptr.... end Here, I used GC.@pre…

Creating C structs with pointers to other structs

General Usage

stevengj September 25, 2019, 12:13pm 6

Sorry, that was a mistake — corrected now.

Topic		Replies	Views
How to get a pointer Ptr{T} that references a variable of type T General Usage ccall	9	3868	February 25, 2018
Clarification on the differences between `Ptr` and `Ref` General Usage	1	1253	March 4, 2020
From type to ptr and back General Usage	4	921	December 12, 2016
Properly using `finalizer`, `ccall`, `cconvert` and `unsafe_convert` General Usage question , ccall	13	3313	October 3, 2017
How to keep a reference for C structure to avoid GC? General Usage	25	2767	November 6, 2019

Creating C structs with pointers to other structs

Related topics