[英]Node JS spawn of child_process
I'm spawning a command to play an audio stream with mpg123
, which works fine.我正在生成一个命令来播放带有
mpg123
的音频 stream ,效果很好。 I expose a method to kill the process as well which also works well, but I can't figure out how to get output from the said command.我也公开了一种杀死进程的方法,它也很有效,但我不知道如何从上述命令中获取 output。
No events are fired on the child processes stdout
, going by the docs it should work - what could be the issue here?在子进程
stdout
上没有触发任何事件,按照它应该工作的文档进行 - 这里可能是什么问题?
One solution I've found is to set stdio
property of spawn
to inherit
, but then spawn
returns null, which is not ideal as I can't create a handle to kill it later.我发现的一种解决方案是将
spawn
的stdio
属性设置为inherit
,但随后spawn
返回 null,这并不理想,因为我无法创建句柄来稍后杀死它。
I'm running this on a Pi Zero with Node 10.24.我在节点 10.24 的 Pi Zero 上运行它。
export const streamFactory = (cb: (data: string) => void) => {
try {
const st = spawn("mpg123", [configManager.getStreamUrl()]);
st.stdout.on("data", (data) => {
console.log(data);
cb(data);
});
return {
close: () => {
st.kill("SIGINT");
},
};
} catch (e) {
console.log(e);
}
};
For some reason, mpg123
outputs its data on stderr
, not stdout
.出于某种原因,
mpg123
将其数据输出到stderr
,而不是stdout
。 Making the switch works like a charm, go figure.使开关像魅力一样工作,go 图。
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