proto

lib/main.dart

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+import 'dart:io';
+import 'dart:ui' as ui;
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:printing/printing.dart';
+import 'package:pdf/widgets.dart' as pw;
+
+Future<void> main() async {
+  runApp(MyApp('PDF Tools'));
+}
+
+// ignore: must_be_immutable
+class MyApp extends StatelessWidget {
+  MyApp(this.title, {Key? key}) : super(key: key);
+  final String title;
+  String openFilePath = "";
+  double dpi = 200;
+  Future convert(String savePath) async {
+    final pdf = pw.Document();
+    final file = File(savePath);
+
+    final openddPdf = await rootBundle.load(openFilePath);
+    var doc = openddPdf.buffer.asUint8List();
+
+    var tempDir = Directory.systemTemp.createTempSync();
+    int index = 1;
+
+    await for (var page in Printing.raster(doc, dpi: dpi)) {
+      final image = await page.toImage();
+      final data = await image.toByteData(format: ui.ImageByteFormat.png);
+
+      if (kDebugMode) {
+        print(tempDir.path);
+      }
+      await File("${tempDir.path}/tmp$index.png")
+          .writeAsBytes(data!.buffer.asUint8List());
+      pdf.addPage(pw.Page(
+        build: (pw.Context context) => pw.Center(
+            child: pw.Image(pw.MemoryImage(data.buffer.asUint8List()))),
+      ));
+
+      index++;
+    }
+    return file.writeAsBytes(await pdf.save());
+  }
+
+  void openFile() async {
+    FilePickerResult? result = await FilePicker.platform
+        .pickFiles(allowMultiple: false, lockParentWindow: true);
+    if (result != null) {
+      openFilePath = result.files.first.path!;
+    } else {
+      // User canceled the picker
+    }
+  }
+
+  void saveFile() async {
+    var savePath = await FilePicker.platform
+        .saveFile(allowedExtensions: ['pdf'], lockParentWindow: true);
+    if (savePath != null) {
+      convert(savePath);
+    } else {
+      // User canceled the picker
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // test();
+    return MaterialApp(
+      home: Scaffold(
+        appBar: AppBar(title: Text(title)),
+        body: Column(
+          children: [
+            const Text("data"),
+            ElevatedButton(
+                onPressed: () => openFile(), child: const Text("open")),
+            ElevatedButton(
+                onPressed: () => saveFile(), child: const Text("save")),
+          ],
+        ),
+      ),
+    );
+  }
+}