写入到Python子进程的stdin中，而没有communication()的阻塞行为 [英] Write to a Python subprocess's stdin without communicate()'s blocking behavior

问题描述

如何将其设为无障碍通话? osd_cat仅接受输入作为PIPE，这需要调用p.communicate()来使进程阻塞.还有其他方法可以在Popen中设置stdin吗?

How do I make this a non-blocking call? osd_cat accepts input only as a PIPE which need p.communicate() call making the process to block. Is there any other way to set stdin in Popen?

p = subprocess.Popen(('osd_cat',
                      '-d',
                      '{}'.format(interval)),
                     stdin=subprocess.PIPE)
p.communicate(message)

推荐答案

p.communicate 方法是一次性的交易.

The p.communicate method is a one-shot deal in terms of sending data to the process.

相反，直接写到 p.stdin .如果要获取输出，可以从 .尝试读取之前，请确保将stdout=subprocess.PIPE传递给构造函数.

Instead, write directly to p.stdin. If you want to get output, you can read lines from p.stdout. Make sure you pass stdout=subprocess.PIPE to the constructor before attempting to read.

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