服务器端建立文件流读入待发送文件进入监听状态，客户端发送信号开始传输，服务器端使用TIdTCPServer组件，客户端对应的使用TIdTCPClient组件。-Build server reads the file stream file to be sent into the listening state, the client sends the signal to start the transmission, the server-side use TIdTCPServer components, corresponding to the client using TIdTCPClient components.