这些字符从内部缓冲器被读出，放在指定的内部数据存储区域。该功能送回检索到的字符数和仍然在输入缓冲器中未经处理的字符数。如果请求输入字符数为0,那么只有输入缓冲器中未经处理的字符数被送回。如果没有足够的字符可用来确保读字节请求且指定被读的字符数为一个非零值，那么在足够的字符被接收完成或暂停时间到之前，操作将不能完成。读字节操作完成时

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