Pdf Render Warnings

This article provides a step by step guide on how to use the PDF rendering warnings feature with Aspose.Words for .NET. We will explain each part of the code in detail. At the end of this tutorial, you will be able to understand how to deal with rendering warnings when converting to PDF.

Before you start, make sure you have installed and configured the Aspose.Words for .NET library in your project. You can find the library and installation instructions on the Aspose website.

Step 1: Define the document directory

To start, you need to define the path to the directory where your documents are located. Replace "YOUR DOCUMENT DIRECTORY" with the actual path to your documents directory.

string dataDir = "YOUR DOCUMENT DIRECTORY";

Step 2: Upload the document

Next, we need to load the document we want to process. In this example, we assume the document is called “WMF with image.docx” and is located in the specified documents directory.

Document doc = new Document(dataDir + "WMF with image.docx");

Step 3: Configure save as PDF options with rendering warnings

To handle rendering warnings when converting to PDF, we need to configure the MetafileRenderingOptions object to specify how metafiles are rendered. We also use the HandleDocumentWarnings option to handle the warnings generated when saving the document.

MetafileRenderingOptions metafileRenderingOptions = new MetafileRenderingOptions
{
     EmulateRasterOperations = false,
     RenderingMode = MetafileRenderingMode.VectorWithFallback
};

PdfSaveOptions saveOptions = new PdfSaveOptions { MetafileRenderingOptions = metafileRenderingOptions };

HandleDocumentWarnings callback = new HandleDocumentWarnings();
doc.WarningCallback = callback;

Step 4: Save document as PDF with rendering warnings

Finally, we can save the document in PDF format using the save options configured previously.

doc.Save(dataDir + "WorkingWithPdfSaveOptions.PdfRenderWarnings.pdf", saveOptions);

Step 5: Handle rendering warnings

Rendering warnings generated when saving the document can be retrieved using the custom warning handler. In this example, we simply print the description of each warning.

foreach(WarningInfo warningInfo in callback.mWarnings)
{
     Console.WriteLine(warningInfo.Description);
}

That’s all ! You have successfully handled rendering warnings when converting a document

to PDF using Aspose.Words for .NET.

Sample source code for PDF rendering warnings with Aspose.Words for .NET

	// The path to the documents directory.
	string dataDir = "YOUR DOCUMENT DIRECTORY";
	Document doc = new Document(dataDir + "WMF with image.docx");

	MetafileRenderingOptions metafileRenderingOptions = new MetafileRenderingOptions
	{
		EmulateRasterOperations = false, RenderingMode = MetafileRenderingMode.VectorWithFallback
	};

	PdfSaveOptions saveOptions = new PdfSaveOptions { MetafileRenderingOptions = metafileRenderingOptions };

	// If Aspose.Words cannot correctly render some of the metafile records
	// to vector graphics then Aspose.Words renders this metafile to a bitmap.
	HandleDocumentWarnings callback = new HandleDocumentWarnings();
	doc.WarningCallback = callback;

	doc.Save(dataDir + "WorkingWithPdfSaveOptions.PdfRenderWarnings.pdf", saveOptions);

	// While the file saves successfully, rendering warnings that occurred during saving are collected here.
	foreach (WarningInfo warningInfo in callback.mWarnings)
	{
		Console.WriteLine(warningInfo.Description);
	}
        

Frequently Asked Questions

Q: What is the functionality of PDF rendering warnings with Aspose.Words for .NET?

The PDF Rendering Warnings feature with Aspose.Words for .NET helps manage warnings generated when converting a document to PDF. It provides a way to detect and address rendering warnings to ensure the quality and integrity of the converted document.

Q: How can I use this feature with Aspose.Words for .NET?

To use this feature with Aspose.Words for .NET, follow these steps:

Set the document directory by specifying the directory path where your documents are located.

Load the document to be processed using the Document method and specifying the file path.

Configure save to PDF options by creating an instance of the PdfSaveOptions class. Use the MetafileRenderingOptions class to specify how metafiles are rendered, and set MetafileRenderingOptions.RenderingMode to MetafileRenderingMode.VectorWithFallback.

Use the HandleDocumentWarnings class to handle rendering warnings. Set doc.WarningCallback to an instance of this class.

Use the Save method to save the document in PDF format specifying the save options.

You can then handle render warnings using the HandleDocumentWarnings class. For example, you can display the description of each warning using a loop.

Q: How do I know if there were any rendering warnings when converting the document to PDF?

You can use the HandleDocumentWarnings class to retrieve rendering warnings generated when saving the document. This class contains a mWarnings list which stores information about warnings. You can browse this list and access each warning’s properties, such as description, to take appropriate action.

Q: What kind of rendering warnings can be generated when converting to PDF?

Rendering warnings when converting to PDF can include warnings related to layout, missing fonts, unsupported images, compatibility issues, etc. The specific warnings will depend on the content of the source document and the conversion options used.

Q: Is it possible to handle rendering warnings in a custom way?

Yes, you can customize rendering warning handling by customizing the HandleDocumentWarnings class. You can add additional functionality to manage warnings specific to your application, such as logging warnings, generating reports, sending alerts, and more.