Call Windows COM library from crystal

Help & Support
1

Hi
Is there any way to call COM dll library from crystal code?

2

You can use C Bindings to call COM API like C.

An incomplete example:

@[Link("ole32")]
lib Ole32
  alias HResult = LibC::ULong

  fun CoInitialize(pvReserved : Void*) : HResult
  fun CoCreateInstance(...) : HResult # parameters are omitted
end

Ole32.CoInitialize(Pointer(Void).null)
Ole32.CoCreateInstance(...)

The above way is low-level calling. If you expect a high-level wrapper like the Ruby win32ole library, AFAIK Crystal doesn’t have one. As a compromise, maybe you can use the mruby library mruby-win32ole via Anyolite .

4 Likes
3

Thanks for helping me!