CODEWITHSUNDEEP
flutterpdfthermal-printerbluetooth-printing
Micro
Micro

Reputation: 29

My question is how can I print an existing PDF via bluetooth thermal printer

How can I connect already loaded PDF into bluetooth thermal printer.

How can I connect already loaded PDF into bluetooth thermal printer.

Upvotes: 0

Views: 2218

Answers (2)

Fermin Salcedo
Fermin Salcedo

Reputation: 51

Good morning guys,

Using ziad-h's answer from https://stackoverflow.com/users/saves/7632367

You can do as follow:

Dependencies:

#Printing dependencies

esc_pos_utils_plus: ^2.0.3

print_bluetooth_thermal: ^1.1.0

pdfx: ^2.6.0

import 'package:pdfx/pdfx.dart';
    
import 'package:print_bluetooth_thermal/print_bluetooth_thermal.dart';
    
import 'package:image/image.dart' as img;

First, you should get the image from your pdf file:

Future<PdfPageImage?> getImage() async {
    final document = await PdfDocument.openAsset('assets/cv.pdf');

    final page = await document.getPage(1);

    final image = await page.render(
      width: page.width * 2, //decrement for less quality
      height: page.height * 2,
      format: PdfPageImageFormat.jpeg,
      backgroundColor: '#ffffff',

      // Crop rect in image for render
      //cropRect: Rect.fromLTRB(left, top, right, bottom),
    );

    return image;
  }

inside your print/ticket generation function declare a new variable

final newImage = await getImage();
final imgs = img.decodeImage(newImage!.bytes);
//Add it to your byte/generator 
bytes += generator.imageRaster(imgs, align: PosAlign.center);

Upvotes: 0

Babul
Babul

Reputation: 1224

Add the following plugin in pubspec.yaml:

dependencies:

  path_provider: ^1.6.27

Update the version number to whatever is current.

And import it in your code.

import 'package:path_provider/path_provider.dart';

You also have to import dart:io to use the File class.

import 'dart:io';

 Future <List<int>> _readPDFFile() async {
      try {
        final Directory directory = await getApplicationDocumentsDirectory();
        final File file = File('${directory.path}/my_file.pdf');
final bytes = File(file.path).readAsBytesSync();
      } catch (e) {
        print("Couldn't read file");
      }
      return bytes;
    }

use thermal printer package link = bluetooth_thermal_printer: ^0.0.6

finally send those bytes data into thermal printer

Future<void> printRecipientPaper() async {
    String isConnected = await BluetoothThermalPrinter.connectionStatus;
    if (isConnected == "true") {
      List<int> bytes = await _readPDFFile();
      final result = await BluetoothThermalPrinter.writeBytes(bytes);
      print("Print $result");
    } else {
      //Hadnle Not Connected Senario
    }
  }

if you have image in pdf file you can follow below link as well How to convert a PDF file to an image with Flutter?

Upvotes: 0

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