IDirect3DTexture9::LockRect

DX9 vtable[19] → HRESULT

IDirect3DTexture9::LockRect is a method of the COM interface IDirect3DTexture9 in Direct3D 9. Its function pointer sits at vtable index 19 — the zero-based slot in that interface's virtual method table, counted from QueryInterface and including every entry inherited from a base interface. It takes 4 parameters (level, locked_rect, rect, flags) and returns HRESULT.

COM methods are reached through that table rather than by an exported name, so the slot index is what a wrapper, an interface hook or a disassembly listing has to resolve against. The parameter order and types below are the ones this interface declares.