For Distributed Collaborative Design System

Cooperative design has already been one of the key technologies in digital design and manufacture under network environment. Some issues on Cooperative design technology have been researched in this dissertation. The Cooperative Design system usually works by transferring the data of model, but it makes difficult for the users to communicate with others because of the limitation of the net bandwidth. We've found a new way to solve the problem. After we analysis the message mechanism of Windows, we got the idea to realize the system and we have finished developing work of the system successfully. The detail of what we have done in the dissertation is following:1. Analysis the actuality and deficiency of the domestic and international CSCD systems. Put forward Distributed Cooperative Design System.2. Introduce and analysis the Message Mechanism of Windows and present the realization method of the system: capture the orders that the Windows send to Pro/E system and package them a message. Then send the message to the other group members by Server. After the other computers accept the message, they analysis the message and use the message to operate the Pro/E system, just like one is operating the Pre/E system. So, we needn' t send the date of the Pro/E model, and just send the simplified operating orders. In this way, we can reduce the transmitting amount of the network greatly. Thus realize the Distributed Cooperative Design System under narrow band environment. And the participants can communicate with each other conveniently, reach to the effect of " what you see is what I see (wysiwis)" .3. Analysis the feasibility of the system development.4. The whole system is divided into three modules: Hook function module, message dealing-with module and net communication module. The function of every modules is following: the Hook function module captures the message which is sent to Pro/E; the message dealing-with module accepts the message and deal with them;the network communication module sends the message that is dealt with by the message dealing-with module to the computer that is at in remote zone.5. Have introduced the main function of the system...