Bug: Exception When No Configuration Is Provided On Web

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Introduction

When working with the PdfCombiner library, developers often encounter issues that can be frustrating to resolve. One such issue is the exception that occurs when no configuration is provided when calling PdfCombiner.createPDFFromMultipleImages. This article will delve into the problem, provide a code example to reproduce the issue, and offer a solution to resolve the exception.

The Problem

The PdfCombiner.createPDFFromMultipleImages method is used to create a PDF from multiple images. However, when this method is called without providing a configuration, an exception occurs on Android. The issue arises because the image width and height are set to 0.

Code to Reproduce

The following code snippet demonstrates how to reproduce the issue:

final response = await PdfCombiner.createPDFFromMultipleImages(
  inputPaths: selectedFiles,
  outputPath: outputFilePath,
);

As you can see, the PdfCombiner.createPDFFromMultipleImages method is called without providing any configuration. This is where the issue occurs.

Related Issue

This issue is related to a known problem in the PdfCombiner library, which has been reported in the following GitHub issue: https://github.com/vicajilau/pdf_combiner/issues/35.

Understanding the Issue

To better understand the issue, let's take a closer look at the PdfCombiner.createPDFFromMultipleImages method. This method takes two parameters: inputPaths and outputPath. However, it does not require any configuration to be provided. When the method is called without a configuration, the image width and height are set to 0, which causes the exception.

Solution

To resolve the exception, you need to provide a configuration when calling the PdfCombiner.createPDFFromMultipleImages method. The configuration should include the image width and height. Here's an example of how to provide a configuration:

final configuration = PdfCombinerConfiguration(
  imageWidth: 800,
  imageHeight: 600,
);

final response = await PdfCombiner.createPDFFromMultipleImages(
  inputPaths: selectedFiles,
  outputPath: outputFilePath,
  configuration: configuration,
);

In this example, a PdfCombinerConfiguration object is created with the image width and height set to 800 and 600, respectively. This configuration is then passed to the PdfCombiner.createPDFFromMultipleImages method.

Best Practices

To avoid this issue in the future, follow these best practices:

  • Always provide a configuration when calling the PdfCombiner.createPDFFromMultipleImages method.
  • Ensure that the image width and height are set correctly in the configuration.
  • Test your code thoroughly to catch any exceptions that may occur.

Conclusion

In conclusion, the exception that occurs when no configuration is provided when calling PdfCombiner.createPDFFromMultipleImages is a common issue that can be resolved by providing a configuration. By following the best practices outlined in this article, you can avoid this issue and ensure that your code runs smoothly.

Troubleshooting Tips

If you're still experiencing issues after following the solution outlined in this article, try the following troubleshooting tips:

  • Check the PdfCombiner library documentation to ensure that you're using the correct method and parameters.
  • Verify that the image width and height are set correctly in the configuration.
  • Test your code in a different environment to rule out any issues with your development setup.

Related Articles

If you're interested in learning more about the PdfCombiner library, check out the following related articles:

FAQs

Q: What is the PdfCombiner library? A: The PdfCombiner library is a Dart library that allows you to combine multiple images into a single PDF file.

Q: Why do I need to provide a configuration when calling PdfCombiner.createPDFFromMultipleImages? A: You need to provide a configuration to ensure that the image width and height are set correctly, which prevents the exception from occurring.

Q: What is the PdfCombiner library?

A: The PdfCombiner library is a Dart library that allows you to combine multiple images into a single PDF file. It provides a simple and easy-to-use API for creating PDFs from images.

Q: Why do I need to provide a configuration when calling PdfCombiner.createPDFFromMultipleImages?

A: You need to provide a configuration to ensure that the image width and height are set correctly, which prevents the exception from occurring. Without a configuration, the image width and height are set to 0, causing the exception.

Q: How do I provide a configuration when calling PdfCombiner.createPDFFromMultipleImages?

A: You can provide a configuration by creating a PdfCombinerConfiguration object and passing it to the PdfCombiner.createPDFFromMultipleImages method. Here's an example:

final configuration = PdfCombinerConfiguration(
  imageWidth: 800,
  imageHeight: 600,
);

final response = await PdfCombiner.createPDFFromMultipleImages(
  inputPaths: selectedFiles,
  outputPath: outputFilePath,
  configuration: configuration,
);

Q: What are the benefits of using the PdfCombiner library?

A: The PdfCombiner library provides several benefits, including:

  • Easy-to-use API: The library provides a simple and easy-to-use API for creating PDFs from images.
  • Customizable: You can customize the PDF creation process by providing a configuration.
  • Fast: The library is optimized for performance and can create PDFs quickly.

Q: Can I use the PdfCombiner library in a web application?

A: Yes, you can use the PdfCombiner library in a web application. However, you need to ensure that the library is properly configured for web use.

Q: How do I troubleshoot issues with the PdfCombiner library?

A: To troubleshoot issues with the PdfCombiner library, follow these steps:

  1. Check the library documentation to ensure that you're using the correct method and parameters.
  2. Verify that the image width and height are set correctly in the configuration.
  3. Test your code in a different environment to rule out any issues with your development setup.

Q: Can I customize the PDF creation process using the PdfCombiner library?

A: Yes, you can customize the PDF creation process using the PdfCombiner library. You can provide a configuration to customize the PDF creation process.

Q: How do I create a custom configuration for the PdfCombiner library?

A: To create a custom configuration for the PdfCombiner library, you need to create a PdfCombinerConfiguration object and set the desired properties. Here's an example:

final configuration = PdfCombinerConfiguration(
  imageWidth: 800,
  imageHeight: 600,
  margin: 10,
  orientation: PdfCombinerOrientation.Landscape,
);

Q: Can I use the PdfCombiner library with other libraries?

A: Yes, you can use the PdfCombiner library with other libraries. However, you need to ensure that the libraries are properly configured and compatible with each other.

Q: How do I get started with the PdfCombiner library?

A: To get started with the PdfCombiner library, follow these steps:

  1. Install the library using your preferred package manager.
  2. Import the library in your Dart file.
  3. Create a PdfCombinerConfiguration object and set the desired properties.
  4. Call the PdfCombiner.createPDFFromMultipleImages method to create a PDF.

Q: Can I contact the PdfCombiner library developers for support?

A: Yes, you can contact the PdfCombiner library developers for support. You can reach out to them through their GitHub repository or by submitting a support ticket.