How to use windowless in Direct3D 9?

Question

I know directshow could use windowless via VMR-9. VMR-9 is based on Direct3D. Could I write a windowless application using Direct3D directly?

Answer 1

I think you can try it as below

1. Create your Direct3D library, say a dll and expose two interface, one is InitD3D which takes an hwnd as a parameter(you need it when you create the device), another is render() which you can call to draw your scene.
2. In your client App code, first call InitD3D to initialize your Direct3D stuffs, then, in the message loop call render to present your scene when there is no message to process.