When the client receives the information about the file, it prepares for it by calling the PrepareReceiveFile (..), and sends a package to the sever to start the file transfer.

客户端接收文件信息时，调用PrepareReceiveFile(. .)作接收前的准备，并发送一个包到服务器告知开始文件传送。

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The file transfer is made in this order: the sever initializes the file transfer by calling the PrepareSendFile (..) function.

文件传输按如下顺序执行：服务器调用PrepareSendFile(. .)函数初始化文件传输。

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