Again, the first parameter to these methods is a descriptor containing the data you wish to send to the remote end point.The amount of data to be sent is given by the length of the descriptor.

• 和上面类似，该函数的第一个参数是包含了要向远程主机发送数据内容的字符串，该字符串的长度就是要发送数据的全部长度。