Python中send和sendall的区别

最新推荐文章于 2024-11-23 17:24:09 发布

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最新推荐文章于 2024-11-23 17:24:09 发布

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文章标签： python shell

原文链接：http://www.cnblogs.com/yang-wei/p/9985241.html

本文详细解析了socket编程中send()与sendall()的区别。send()发送数据并返回实际发送的字节数，可能小于预期；而sendall()确保所有数据被发送，否则抛出异常。通过对比两者的使用场景，帮助读者理解如何有效进行数据传输。

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官方文档对socket模式下的socket.send() 和 socket.sendall()解释如下：

sock.sendall(string[, flags])

Send data to the socket. The socket must be connected to a remote socket. The optional flags argument has the same meaning as for recv() above. Unlike send(), this method continues to send data from string until either all data has been sent or an error occure. None is returned on success. On error, an exception is raised, and there is no way to datermine how much data, if any, was successfully sent.

尝试发送string的所有数据，成功则返回None，失败则抛出异常。

socket.send(string [, flags])

Send data to the socket. The socket must be connected to a remote socket. The optional flags argument has the same meaning as for recv() above. Returns the number of bytes snet. Applications are responsible for checking that all data has been sent; if only some of the data was transmitted, the application needs to attempt delivery of the remaining data.

send()的返回值式发送的字节数量，这个数量值可能小于要发送的string的字节数，也就是说可能无法发送string中所有的数据。如果有错误，则会抛出异常。

所以，下面两段代码是等价的：

sock.sendall("Hello world\n")

buffer = "Hello world\n"
while buffer:
    bytes = sock.send(buffer)
    buffer = buffer[bytes:]

转载于:https://www.cnblogs.com/yang-wei/p/9985241.html