node.js - Imagemagick/Shell/子进程 NodeJS

Question

我似乎无法让 Node 理解我的 Imagemagick 转换命令。它在终端中运行良好，我已经尝试了大量不同的转义字符排列，但它仍然读取我的 args 数组中的每个单独的字符串值，以尝试转换图像:

转换\
输入.jpg\
-写入mpr:XY\
+删除\
-尊重括号\
\( mpr:XY -resize x640 -采样因子 4:2:0 -strip -interlace Plane +write output-640.jpg\)\
\( mpr:XY -resize x320 -采样因子 4:2:0 -strip -interlace Plane +write output-320.jpg\)\
\( mpr:XY -resize x155 -采样因子 4:2:0 -strip -interlace Plane +write output-155.jpg\)\
\( mpr:XY -调整大小 x45 -采样因子 4:2:0 -strip -交错平面 +写入输出-45.jpg\)\
空:

这在 shell 中运行得很好。然而，这段代码完全失败了

// const spawn = require('child-process-promise').spawn;
var spawn = require('child_process').spawn;

function argsForSize(number) {
  return [
    '\\(',
    'mpr:XY',
    '-resize',
    'x' + number, 
    '-sampling-factor', 
    '4:2:0', 
    '-strip', 
    '-interlace', 
    'Plane', 
    '+write', 
    'output-' + number +'.jpg', 
    '\\)\\'
  ]
}

let inputPath = '/Users/xconanm/Desktop/imagemagick/test-app/input.jpg';

var args = [
  inputPath, '\\',
  '-write', 'mpr:XY', '\\',       // resize width to 640
  '+delete', '\\',      
  '-respect-parentheses', '\\'
];
let extraArgs = argsForSize(640).concat(argsForSize(320)).concat(argsForSize(155)).concat(argsForSize(55));

extraArgs.push('null:');

args = args.concat(extraArgs)

let child = spawn('convert', args)
console.log(args);

child.stdout.on('data', function(data) {
  console.log('stdout: ' + data);
  //Here is where the output goes
});
child.stderr.on('data', function(data) {
  console.log('stderr: ' + data);
  //Here is where the error output goes
});
child.on('close', function(code) {
  console.log('closing code: ' + code);
  //Here you can get the exit code of the script
});

Answer 1

明白了......可能效率低下，但是:耸肩

// const spawn = require('child-process-promise').spawn;
var spawn = require('child_process').spawn;

function argsForSize(number) {
  return [
    '-write', 
    'mpr:XY', 
    '+delete',
    '-respect-parentheses',
    'mpr:XY',
    '-resize',
    'x' + number, 
    '-sampling-factor', 
    '4:2:0', 
    '-strip', 
    '-interlace', 
    'Plane', 
    '-write', 
    'output-' + number +'.jpg'
  ]
}

let inputPath = '/Users/xconanm/Desktop/imagemagick/test-app/input.jpg';

var args = [
  inputPath
];
let extraArgs = argsForSize(640).concat(argsForSize(320)).concat(argsForSize(155)).concat(argsForSize(55));

extraArgs.push('null:');

args = args.concat(extraArgs)

let child = spawn('convert', args)
console.log(args);

child.stdout.on('data', function(data) {
  console.log('stdout: ' + data);
  //Here is where the output goes
});
child.stderr.on('data', function(data) {
  console.log('stderr: ' + data);
  //Here is where the error output goes
});
child.on('close', function(code) {
  console.log('closing code: ' + code);
  //Here you can get the exit code of the script
  process.exit();
});