node.js - NodeJs，如何显示完整的 STDERR 消息？

Question

请帮助我如何从进程中获取完整的错误字符串(以传入 res.send())？例如，现在在控制台中打印:

Child Process STDERR: src/sketch.ino: In function ‘void setup()’:
src/sketch.ino:17:11: error: ‘led’ was not declared in this scope
src/sketch.ino: In function ‘void loop()’:
src/sketch.ino:23:15: error: ‘led’ was not declared in this scope
make: *** [.build/atmega328/src/sketch.o] Error 1

但是当我通过 res.send('Error:\n'+ stderr); 时，我只打印 "Error: src/sketch.ino: In function 'voi"。为什么会截断消息？那么如何通过完整的考试呢？

这是我的代码:

var exec = require('child_process').exec;

var inoVerify = exec('ino build -m atmega328', { cwd: codeFile.projectPath }, function(error, stdout, stderr) {
    console.log('Child Process STDERR: '+ stderr);
    if (stderr)
        res.send('Error:\n'+ stderr);                   
});

Answer 1

这是一些执行限制。我更改了此示例以使用生成过程，如下所示:

var spawn = require('child_process').spawn;

var inoVerify    = spawn('ino', ['build', '-m', 'atmega328'], { cwd: codeFile.projectPath });

inoVerify.stdout.on('data', function (data) {
  console.log('stdout: ' + data);
});

inoVerify.stderr.on('data', function (data) {
  console.log('stderr: ' + data);
  res.end('stderr: ' + data);
});

inoVerify.on('close', function (code) {
  console.log('child process exited with code ' + code);
});

以 http://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options 为例