How to Fix the pdf Library Error When Generating Long PDF Documents in Flutter

Learn how to resolve the `Unhandled Exception` error in the Flutter `pdf` library by adjusting the maximum page limit for generated documents.
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This video is based on the question https://stackoverflow.com/q/74193159/ asked by the user 'Adil Shinwari' ( https://stackoverflow.com/u/19181173/ ) and on the answer https://stackoverflow.com/a/74194387/ provided by the user 'Richard Heap' ( https://stackoverflow.com/u/9597706/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting PDF Generation in Flutter: Handling Long Text from APIs

Generating PDF documents in Flutter using the pdf library can sometimes be a challenging task, especially when dealing with long text inputs from APIs. If you've attempted to add text content that spans multiple pages and encountered the dreaded Unhandled Exception error, don't worry! In this guide, we'll delve into why this error occurs and how to resolve it effectively.

The Problem: Unhandled Exception Error

When generating PDFs with the pdf library, you may run into the following error message:

[[See Video to Reveal this Text or Code Snippet]]

This typically occurs when your input text is too long, exceeding the default page limit set by the library. The error message essentially means that the MultiPage widget has determined that it needs to create more pages than allowed, which results in an exception being thrown.

Understanding the Error

From the stack trace, we can see that the error originates from the MultiPage class, which is responsible for handling widgets that span multiple pages. By default, the maxPages property is set to 20. If your document exceeds this limit, the pdf library throws the error to prevent excessive resource usage or rendering issues.

The Solution: Adjusting the Page Limit

To resolve this issue, follow these steps to adjust the maximum number of pages allowed when generating your PDF document.

Step 1: Identifying the Current Limit

In your existing code, you may be using the MultiPage widget like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Set a Higher Page Limit

To prevent the exception from occurring, you can set maxPages to a higher value that suits your application's requirements. Here's how you can modify your code:

[[See Video to Reveal this Text or Code Snippet]]

Adjusting the maxPages parameter gives you the flexibility to handle longer texts that may be sourced from your API. Be sure to assess how long your texts can get and set this value accordingly to avoid hitting the page limit prematurely.

Conclusion

By following the steps outlined in this guide, you can successfully handle longer text inputs in your PDF documents generated with Flutter. Remember, while it's important to set an appropriate maxPages value, also keep in mind the potential performance implications of generating overly long documents.

Next time you work on creating PDFs that feature extensive content, you'll be better equipped to handle the flow of your information without running into exceptions. Happy coding!

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