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update example for electron version 24.0.0 #14

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29 changes: 24 additions & 5 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,16 +3,35 @@ Tesseract.js Electron

An example to use tesseract.js in electron.

Please check index.html for details.
1. Loading image in `index.html` and passing the `path` to `main.js`.

## Installation
2. `main.js` recognize the image and returns the result.

3. Then `index.html` displays the result.

# run the example
```bash
# install
$ npm install
```

## Run
# run
$ npm run start
```

# init script (no need to run for example)
```bash
$ npm start
# There is no need for a specific version, just make a record.
# Please try other versions by yourself.

$ node --version
# v16.16.0

$ npm --version
# 9.6.2

# init project
$ npm init -f

# install
$ npm install electron tesseract.js --save-dev
```
40 changes: 26 additions & 14 deletions index.html
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Expand Up @@ -7,23 +7,35 @@
<meta http-equiv="Content-Security-Policy" content="script-src 'self' 'unsafe-inline';" />
</head>
<body>
<img id="image" class="display: none" />
<input id="fileinput" accept="image/jpeg, image/png" type="file" />
<div id="recognize" style="white-space: pre-line"></div>
<script>
const { createWorker } = require('tesseract.js');
const path = require('path');
const image = document.getElementById("image")
const fileinput = document.getElementById("fileinput")
const recognize = document.getElementById("recognize")

const worker = createWorker({
cachePath: path.join(__dirname, 'lang-data'),
logger: m => console.log(m),
});
const changeHandle = async (event) => {
const file = event.target?.files?.[0]
if (!file) return
const path = file.path
if (path) {
image.src = path
image.style.display = "block"
image.style.height = "200px"
image.style.border = "1px solid"
}
recognize.innerText = `file path:\n${path}\n\nresult:\nloading...`
const json = await window.electronAPI.recognize(path)
const result = JSON.parse(json)

(async () => {
await worker.load();
await worker.loadLanguage('eng');
await worker.initialize('eng');
const { data: { text } } = await worker.recognize(path.join(__dirname, 'images', 'testocr.png'));
console.log(text);
await worker.terminate();
})();
console.log("file path:")
console.log(path)
console.log("result:")
console.log(result?.data?.text)
recognize.innerText = `file path:\n${path}\n\nresult:\n${result?.data?.text}`
}
fileinput.addEventListener("change", changeHandle)
</script>
</body>
</html>
47 changes: 34 additions & 13 deletions main.js
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@@ -1,4 +1,25 @@
const { app, BrowserWindow } = require('electron')
const { app, BrowserWindow, ipcMain } = require('electron')
const { join } = require('path')
const { createWorker } = require('tesseract.js')

const recognize = async (event, path) => {
const worker = await createWorker({
cachePath: join(__dirname, '/lang-data'),
logger: (m) => console.log(JSON.stringify(m)),
errorHandler: (e) => console.log(JSON.stringify(e))
})
await worker.loadLanguage('eng')
await worker.initialize('eng')
const result = await worker.recognize(path)
await worker.terminate()

console.log("image path:")
console.log(path)
console.log("recognize text:")
console.log(result?.data?.text)

return JSON.stringify(result)
}

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
Expand All @@ -10,6 +31,7 @@ function createWindow () {
width: 800,
height: 600,
webPreferences: {
preload: join(__dirname, "./preload.js"),
nodeIntegration: true
}
})
Expand All @@ -29,10 +51,17 @@ function createWindow () {
})
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)
app.whenReady().then(() => {
ipcMain.handle('recognize', recognize)

createWindow()

app.on("activate", function () {
// On macOS it's common to re-create a window in the app when the
// dock icon is clicked and there are no other windows open.
if (BrowserWindow.getAllWindows().length === 0) createWindow()
})
})

// Quit when all windows are closed.
app.on('window-all-closed', () => {
Expand All @@ -43,13 +72,5 @@ app.on('window-all-closed', () => {
}
})

app.on('activate', () => {
// On macOS it's common to re-create a window in the app when the
// dock icon is clicked and there are no other windows open.
if (win === null) {
createWindow()
}
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.
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