This project aim was to build wireless software modem for data communication between two computers using an acoustic interface in the voice frequency range (20Hz– 20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz – 2

一个自编的读取文本文件数据的函数，可以读取整个文件，读取第N行，读取第M行到第N行，读取第M行到倒数第N行，读取第M次（也可以是最后一次、倒数第M次）出现字符串str的行开始（或结束）的数据，等等。希望能给大家带来帮助！ -A self-read text file data function, you can read the entire document, read the first N lines, M reads the first line to the first N lin