In C# Application , I am trying to open/load a PDF file using the Aspose.Pdf.Document this is the code
//
string path = @“C:\Users\YourUser\Documents\my-test.pdf”;
var pdfDocument = new Aspose.Pdf.Document(path);
it is throwing the error 'Aspose.Pdf.InvalidPdfFileFormatException: ‘Trailer not found’ when i try to open /load pdf file , my nugget version is 25.7.0
apose.pdf-error.PNG (66.9 KB)
apose.pdf-erro-wih-nugget-version.PNG (37.8 KB)
i need to fix this ASAP,
Cause
The error message ‘Trailer not found’ indicates that the PDF file you are trying to open may be corrupted or not in a valid PDF format. This can happen if the file is incomplete, improperly generated, or if it has been altered in a way that breaks its structure.
Solution
To resolve this issue, you can try the following steps:
Check the PDF File: Ensure that the PDF file is not corrupted. You can try opening it in a standard PDF viewer (like Adobe Acrobat) to see if it opens without issues.
Recreate the PDF: If the file is indeed corrupted, try to obtain a fresh copy of the PDF or recreate it from the original source.
Use a Different Version: If you suspect that the issue might be related to the version of Aspose.Pdf you are using, consider updating to the latest version of the library. Sometimes, bugs are fixed in newer releases.
Error Handling: Implement error handling in your code to catch exceptions and provide more informative messages.
Code
Here’s a simple example of how to implement error handling when loading a PDF:
string path = @"C:\Users\YourUser\Documents\my-test.pdf";
try
{
var pdfDocument = new Aspose.Pdf.Document(path);
// Proceed with your operations on the pdfDocument
}
catch (Aspose.Pdf.InvalidPdfFileFormatException ex)
{
Console.WriteLine("Error: " + ex.Message);
// Additional logging or handling
}
catch (Exception ex)
{
Console.WriteLine("An unexpected error occurred: " + ex.Message);
}
Next Steps
Please follow these steps, and let me know if you need further assistance!
I tried create a pdf file using the aspose.pdf still it is throwing the same error , the file is not corrupted, it is exists , and opening in an browser , in my nugget this is the latest version of Aspose.pdf please connect me to the support team
actually i am converting the image files to pdf. and i try to open a pdf for other operation using the Aspose.pdf , it is throwing the error, please connect me to the support
Would you please share your sample PDF document for our reference so that we can test the scenario in our environment and address it accordingly?
Sure , @asad.ali
f73fefb67fa08323d31729ed1513d405.jpeg (75.6 KB)
f73fefb67fa08323d31729ed1513d405.pdf (178.5 KB)
you can see , i attached the 2 input files i used,
the jepg file is the source for the pdf file, i tried created the pdf using the Aspose.pdf, that is all fine, working, but right after i try to load /open the pdf file using the same Aspose.pdf.document, it throws an error, AsposeInvalidPDF Format’Trailor not Found’ exception, this is the scenario, i also try opening the pdf file which is not created by apose library too, it is also throwing the same error, So kindly fix this issue ASAP.
We tested your PDF file with 25.7 version of the API in our environment and we could not replicate the exception you reported. The document was loaded just fine. Can you please make sure that you test using the latest version and if issue still persists, please let us know. We will further proceed accordingly.
but , i am unable to. how ? send me your code tested, did you try to open/load the pdf the file that is created by aspose. Is Aspose.Pdf.Document will not not support parallelism, my code is under the parallel multi threading code block use task Async/Await ?try also this scenario.
i am unable narrow down the issue, this is my code
string tpath = @“C:\Users\vs\Documents\f73fefb67fa08323d31729ed1513d405.pdf”;
var pdfDocument = new Aspose.Pdf.Document(tpath);
simple code , the pdf file that i have sent you, is not loading throwing the error , check the secenario. create a pdf file using aspose and try to open/load right after pdf is created using the Aspose both should be under the parallelism,
FYI my nugget package version is 25.7.0 and runtime version is v4.0.30319 in my .net application
We tested with same 25.7 version under .NET Framework 4.8 in a console application. Below is the sample code snippet:
using (Document doc = new Document(dataDir + "f73fefb67fa08323d31729ed1513d405.pdf"))
{
// Perform other operations here
}
You mentioned that you are using threads for parallel execution. Can you please elaborate more as it may be the main reason behind the issue you are facing. If possible, please share a minimal code sample of how you are using multi-threading so that we can try again to replicate the issue in our environment and address it accordingly.
yeah, @asad.ali actually i fixed the issue by using the Aspose.imaging library for pdf creation instead of Aspose.pdf So, now it perfectly fine, i think aspose.pdf has some issue on pdf creation looks like, its a invalid pdf format is creating from the jpeg file , I already told you i am using parallelism its simply Task Async/Await code Tasks.Add(Task.Run(async () =>
{ //Opening a pdf file })); thats it , my .net application is .net framework version of 4.0,it is old windows forms application. for now it is fixed and working
thanks
It’s great to hear that you were able to resolve the issue. The problem with Aspose.PDF might have occurred if the file was accessed simultaneously by multiple threads. Please keep in mind that Aspose.PDF is a thread-safe API, provided that each document is accessed by only one thread at a time. That said, it’s good to know the issue has been resolved on your end. If you need any further assistance, please don’t hesitate to reach out to us.