虚拟通道技能(国外英文资料).docVIP

虚拟通道技术(国外英文资料) You can call the VirtualChannelOpen function to open the virtual channel registered by the VirtualChannelInit function. The VirtualChannelOpen function will specify a pointer for your VirtualChannelOpenEvent callback function. When the VirtualChannelOpen function call returns, you can call the VirtualChannelWrite function to write the virtual channel. The writing process is asynchronous, so you dont have to release or redistribute the buffer until the VirtualChannelOpenEvent function shows that the process is complete. When you call VirtualChannelWrite function, you can see the state of the writing process by some user data, when invoking VirtualChannelOpenEvent, terminal services will be called by returning the user data to inform you the process of writing has been completed. On the server at the end of the virtual channel, the server plug-in invokes the WTSVirtualChannelRead function to read the data. When the server-side component writes the data to the server, the endpoint service can also call the VirtualChannelOpenEvent function to get the corresponding information. The server-side component writes the data to the server by calling the WTSVirtualChannelWrite function. The client and server side components can write any size of data in a virtual channel. However, before sending the data, the terminal service splits the data into a segment of the CHANNEL_CHUNK_LENGTH byte. The terminal service calls the VirtualChannelOpenEvent function for each piece of data, rather than re-establishing it as a size package. Each call to VirtualChannelOpenEvent shows the size of the data fragment and shows the start, middle, or end of the sending data. The VirtualChannelClose function is used to close a channel. However, you do not have to display this function. Because when a tearer disconnects from the server, the terminal service automatically closes all the channels. 4. Virtual Channel Client Registration You must register the name of the client DLL in the r