如何在 flutter 中将照片添加到 PDF

Question

我使用这个库https://pub.dev/packages/pdf来生成 PDF。问题是我无法\xe2\x80\x99 设法将照片添加到我的 PDF 中。每张照片的路径都保存在List对象中。这就是我尝试实现的方式：

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import \'package:pdf/widgets.dart\' as pw;\n\xe2\x80\x8b\n\xe2\x80\x8b\nFuture<void> generatePDF() async {\n\xe2\x80\x8b\npdf = pw.Document();\n\xe2\x80\x8b\n    pdf.addPage(\n      pw.MultiPage(\n        pageFormat: PdfPageFormat.a4,\n        build: (pw.Context context) => [\n          pw.Partitions(\n            children: [\n              pw.Partition(\n                child: pw.Column(\n                  crossAxisAlignment: pw.CrossAxisAlignment.start,\n                  children: <pw.Widget>[\n\xe2\x80\x8b\n                  /// Photos list\n                    pw.ListView.builder(\n                      itemCount: 1,\n                      itemBuilder: (pw.Context context, int index) {\n                        return pw.Column(\n                          children: _photosList\n                                  ?.map(\n                                    (photo) async => pw.Column(\n                                      children: <pw.Widget>[\n                                        pw.Text(\n                                            "Photo id: ${photo.photoId} - Photo type: ${photo.photoType}"), // This is displayed correctly for each photo\n                                        pw.Image(\n                                          pw.MemoryImage(\n                                            (await rootBundle\n                                                    .load(\'${photo.photoPath}\')) // This is not working because the photos are not in rootBundle and I can\'t find a solution to replace this line\n                                                .buffer\n                                                .asUint8List(),\n                                          ),\n                                        ),\n                                      ],\n                                    ),\n                                  )\n                                  ?.toList() ??\n                              [],\n                        );\n                      },\n                    ),\n                  ],\n                ),\n              ),\n            ],\n          ),\n        ],\n      ),\n    );\n    print(\'PDF Generated\');\n  }\n

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输出：

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Answer 1

导入飞镖：io

import 'dart:io';

如果你有路径，你可以用它创建一个文件。

File photo1 = File(photo.photoPath);

然后，您可以使用以下语句将该文件加载到 PDF：

MemoryImage memoryImage = pw.MemoryImage(photo1.readAsBytesSync()); //you could use async as well

这将为您留下来自 photoPath 的 MemoryImage。然后你可以简单地添加它：

pw.Image(memoryImage)