电子无法在Windows 10上写入文件

Question

Using fs-extra to write files is failing on windows 10. The outputFile method is supposed to create any missing directory before writing, but it's throwing an error. I know the Downloads directory already exists, though.

Error: ENOENT: no such file or directory, open 'C:\\Users\\josh\\Downloads\\2018-01-13_15:14:11.png'

const fs = require('fs-extra')
const app = require('electron').remote.app
const moment = require('moment')

let dataURL = this.$.canvas.toDataURL()
let filename = moment().format('YYYY-MM-DD_HH:mm:ss') + '.png'
let buffer = new Buffer(dataURL.replace('data:image/png;base64', ''), 'base64')
let filepath = path.resolve(app.getPath('downloads'), filename)
fs.outputFile(filepath, buffer, err => {
    if (err) {
        console.error(err)
    }
})

Answer 1

You cannot use colon ':' in the filename on Windows.

From Naming Files, Paths, and Namespaces :

Use any character in the current code page for a name, including Unicode characters and characters in the extended character set (128–255), except for the following:

• The following reserved characters:

  • < (less than)
  • > (greater than)
  • : (colon)
  • " (double quote)
  • / (forward slash)
  • \\ (backslash)
  • | (vertical bar or pipe)
  • ? (question mark)
  • * (asterisk)
• Integer value zero, sometimes referred to as the ASCII NUL character.
• Characters whose integer representations are in the range from 1 through 31, except for alternate data streams where these characters are allowed. For more information about file streams, see File Streams.
• Any other character that the target file system does not allow.