when i hook ppsspp direct3d9, it can not capture anything

[weituotian]

Debug: DXHookD3D9: Hook: End
Debug: DXHookD3D9: Hook: Device created
Debug: DXHookD3D9: Hook: Before device creation
Debug: DXHookD3D9: Hook: Begin
Debug: Autodetect found Direct3D 9
Information: Remote process is a 32-bit process.
Information: Injected into process Id:18368.

screenshot is null and i do not know how to find what is the reason and deal with it