python - what's the difference between pycurl.WRITEFUNCTION and pycurl.WRITEDATA?

Question

I just want to know the difference of the following two statements:

curl.setopt(pycurl.WRITEDATA, fp)
curl.setopt(pycurl.WRITEFUNCTION, fp.write)

fp is a file descriptor, and fp.write is a function. Could anybody tell me?

Answer 1

使用WRITEDATA回调选项，您可以控制默认WRITEFUNCTION回调写​​入哪个文件。

使用该WRITEFUNCTION选项设置的函数是在收到需要保存的数据时实际调用的函数。

通常，您指定的值WRITEDATA将传递给WRITEFUNCTION回调，但在PyCurl 中，WRITEFUNCTION回调只接受一个字符串作为参数WRITEDATA，因此在 PyCurl 中与 with WRITEFUNCTION一起使用并没有多大用处。