关于surface->GetDC()

jsmart2007

为什么我调用总是失败？surface是从texture取得的

Jeminai

也许得用这个生成的Surface才行：
IDirect3DDevice9::CreateOffscreenPlainSurface

xoyojank

IDirect3DSurface9::GetDC is valid on the following formats only: D3DFMT_R5G6B5, D3DFMT_X1R5G5B5, D3DFMT_R8G8B8, and D3DFMT_X8R8G8B8. Formats that contain Alpha are not supported because the GDI implementations don't have a well-defined behavior on the alpha channel. For more information about formats, see D3DFORMAT.

xoyojank

IDirect3DSurface9::GetDC will fail if the surface is already locked. If the surface is a member of a mipmap or cubemap, IDirect3DSurface9::GetDC fails if any other mipmap or cubemap member is locked.
IDirect3DSurface9::GetDC fails on render targets unless they were created lockable (or, in the case of back buffers, with the D3DPRESENTFLAG_LOCKABLE_BACKBUFFER flag).
For surfaces not created with IDirect3DDevice9::CreateOffscreenPlainSurface, IDirect3DSurface9::GetDC will fail on default pool (D3DPOOL_DEFAULT) surfaces unless they are dynamic (D3DUSAGE_DYNAMIC) or are lockable render targets.
IDirect3DSurface9::GetDC will fail on D3DPOOL_SCRATCH surfaces.

jsmart2007

是这样的，我在系统内存里建立的一个Texture，然后直接从这个Texture取的一个表面，这个Texture的Format是D3DFMT_X8R8G8B8，再GetDC就出错了。

jsmart2007

OK,已经解决拉