[英]Read stdout of spawned process that is waiting for input
I have a Swift program that logs info to the stdout
while waiting for a \\n
(that terminates the execution). 我有一个Swift程序,它在等待
\\n
(终止执行)时将信息记录到stdout
。 It requests the input immediately after start running and logs info 1~2 seconds after: 它在开始运行后立即请求输入并在以下情况后1~2秒记录信息:
fetchAndLogDataInBackground(); // will print some data in ~1 sec
readLine();
I'm spawn
ing/ execFile
ing it with the following: 我正在使用以下内容
spawn
/ execFile
:
const spawn = require('child_process').spawn;
const process = spawn('swift/main');
process.stdout.on('data', data => console.log(data.toString()));
setTimeout(() => {
process.stdin.write('\n');
}, 5000);
I was expecting to see the logs "live" since I'm using on('data')
, but they are only being processed after the process.stdin.write('\\n');
我希望看到日志“正常”,因为我正在使用
on('data')
,但它们只是在process.stdin.write('\\n');
之后process.stdin.write('\\n');
There's any way to get the data "live"? 有什么办法让数据“实时”?
PS: if I run the Swift program in terminal ( swift/main
), it works as expected. PS:如果我在终端(
swift/main
)中运行Swift程序,它会按预期工作。
You may have to either disable stdout buffering or manually flush stdout in Swift. 您可能必须禁用stdout缓冲或在Swift中手动刷新stdout。
To manually flush: 要手动清除:
fflush(__stdoutp)
To disable output buffering: 要禁用输出缓冲:
setbuf(__stdoutp, nil);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.