SurfaceFlinger server 和 client不用Binder通信？

Question

本帖最后由 kris_fei 于 2011-05-18 09:04:08 编辑

Answer 1

找到问题了。
       sp<ISurfaceComposerClient> conn = sm->createConnection()；
会调用到
       virtual sp<ISurfaceComposerClient> createConnection()
    {
        uint32_t n;
        Parcel data, reply;
        data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
        remote()->transact(BnSurfaceComposer::CREATE_CONNECTION, data, &reply);
        return interface_cast<ISurfaceComposerClient>(reply.readStrongBinder());
    }
中间有句
     interface_cast<ISurfaceComposerClient>(reply.readStrongBinder());
    这样就得到了BpSurfaceComposerClient。
    因此conn的值不是BnSurfaceComposerClient类型，而是BpSurfaceComposerClient。