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2023 :: How to do callbacks?

• Kerp (orginal) [2016-02-07T11:20:23+01:00] view original

  I searched the manual. Did not find an example.

  So first here is the code i'm working with in the glfw3 Wrapper

  type
      KeyFun* = proc (window: Window; key: cint; scancode: cint; action: cint; modifiers: cint) {.cdecl.}
  
  Run

  and the code i'm trying to implement in my program

  proc SetKeyCallback*(window: Window; cbfun: KeyFun): KeyFun {.cdecl, importc: "glfwSetKeyCallback", dynlib: GlfwLib.}
  Run

  i can call the setkeycallback proc fine but how do i get the cbfun var in the setkeycallback proc to work?

  i tried the c method of just putting the proc name for a var into the callback proc. But i get a type mismatch error it expects KeyFun in the setKeycallback proc

  so i'm stumped...

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• Araq (orginal) [2016-02-07T11:38:03+01:00] view original

  Read this and annotate the proc you want to pass with .cdecl too:

  http://nim-lang.org/docs/manual.html#types-procedural-type

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