It works perfectly on runtime node but not in asar

I developed an react+Electron application with node-adodb on Windows. It works perfectly in development mode, but when packaging everything (create the .exe and other electron files), the connection.query got “Uncaught Fatal Exception”

Using node-adodb version 4.2.2 React 16.4.0 electron 2.0.5 electron-builder: 20.15.1

main.js code

ipcMain.on('read-cid', (event, obj) => {
  const connection = ADODB.open('Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\Users\\DB.mdb;')
  async function query() {
      try {
          const users = await connection.query(`SELECT top 1 id_birth, id_addr FROM IDBaseInfo  `)
          event.returnValue = users
      } catch (error) {
           event.returnValue = error
      }
  }
  query()
})

不打包成asar就运行良好，打包成asar，就会出现Uncaught Fatal Exception,请问有什么方法可以在打包成asar的情况下使用模块吗 谢谢！

[lega0208]

Yeah, so I had this issue a few months ago and figure out the problem. Basically this. Packaged Electron projects don’t play well with child_process.spawn. And also cwd() doesn’t work properly in asar files, that may have also contributed. I forget.

But the workaround is the following:

1. In your packager settings, add a glob that matches the node-adodb package to the asar.unpack setting.
2. Go to line 13 of proxy.js and change it so that it matches the unpacked directory.

The way I did this was I changed require.resolve('./adodb') to require.resolve('./adodb').replace('app.asar', 'app.asar.unpacked')

I also published my own npm package to make things easier for myself, you can try it out if you want, and see if it works for you. It doesn’t use the latest version though so just be aware of that. Just don’t forget to add the unpacked setting or it won’t work.

npm i -S node-adodb-electronfork

Hope it works out for you. Cheers.

[HaveF]

Get everything work by a trick.

I use webpack.

• In the main process add this before opening the BrowserWindow

const nodeEnv = process.env.NODE_ENV;

if(nodeEnv === 'development'){
  global.ADODB = require('node-adodb')
} else {
  let libPath = path.join(app.getAppPath(), 'node_modules/node-adodb').replace('app.asar', 'app.asar.unpacked')
  global.ADODB = require(libPath)
}

• In the renderer process pick the value this way:

const ADODB = require('electron').remote.getGlobal('ADODB')

Btw, new Electron version does not work in the situation, I tried on 4.0.0-nightly.20181010

Cheers

REF: node.js - How can I bundle a precompiled binary with electron - Stack Overflow