说明：  C语言编写的UDP简单文件传输协议TFTP，含客户端和服务端 默认的下载路径为E:/up/，文件将被下载到E:/dn/下；默认的上传路径为E:/dn/,文件将被上传到E:/up/下，也可以通过改变源码更改下载上传路径 不仅支持简单的文本传输，也支持视频音频压缩以及大文件的传输，且传输速度快
(C language UDP Simple File Transfer Protocol TFTP, including client and server to download the default path for the E:/up /, files will be downloaded to the E:/dn/under the default upload path for the E:/dn /, files will be uploaded to E:/up/under, you can change by changing the source code download upload path not only support the simple text transmission, also supports video and audio compression and transmission of large files, and transmission speed)