Real-time screen Transmission

Basic knowledge:

About the mirror driver in DDK:

The mirror driver is a display driver in Windows NT. All commands sent from the system to the physical graphics card are also sent to the mirror driver. The display content of the current system can be simulated in the mirror driver, therefore, it is called mirror. Using this feature, you can easily capture the content of the current screen and the area (changed part) to be drawn by the system. It is a fast screenshot method. However, the mirror driver is also defective and does not support DirectX hardware acceleration because it is soft. Considering that most of the screen broadcasting software is used for teaching or conferences, it has little impact on DirectX.

 

Currently, WinVNC is open-source, but its driver is not public, but the vnchook. DLL code is public.

In fact, its driver can reverse it for several days.

Driver mode (push mode) mirror DRIVER:
Advantage: less CPU resources (1-5%), fast. High real-time performance.
Disadvantages: supported by A. Window 2000/XP/2003, not 98.
B. the driver must be restarted before use.
Hook method (PULL mode poll) HOOK:
Advantage: The system supports a wide range of services and can be used without restarting.
Disadvantage: CPU usage is high.
Solution: two types of development are available. The Windows 2000, XP, and 2003 systems adopt drive-side actions, while other systems use hook methods.