Extract Attachments from PDF via C++

How to Extract Attachments from PDF programmatically with C++

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How to Extract Attachments Using C++ Library

In order to extract Attachments in PDF file, we’ll use Aspose.PDF for C++ API which is a feature-rich, powerful and easy to use document manipulation API for cpp platform. Open NuGet package manager, search for Aspose.PDF and install. You may also use the following command from the Package Manager Console.

Package Manager Console

PM > Install-Package Aspose.PDF.Cpp

Extract Attachments from PDF C++

You need Aspose.PDF for C++ to try the code in your environment.

  1. Get embedded files collection.
  2. Get count of the embedded files.
  3. Loop through the collection to get all the attachments.
  4. Check if parameter object contains the parameters.
  5. Get the Attachment and write to file or stream.

Extract Attachment from PDF document

// Open document
auto pdfDocument = new Document(_dataDir + u"GetAlltheAttachments.pdf");

// Get embedded files collection
auto embeddedFiles = pdfDocument->get_EmbeddedFiles();

// Get count of the embedded files
Console::WriteLine(u"Total files : {0}", embeddedFiles->get_Count());

int count = 1;

// Loop through the collection to get all the attachments
for (auto fileSpecification : embeddedFiles)
{
	Console::WriteLine(u"Name: {0}", 
		fileSpecification->get_Name());
	Console::WriteLine(u"Description: {0}", 
		fileSpecification->get_Description());
	Console::WriteLine(u"Mime Type: {0}", 
		fileSpecification->get_MIMEType());

	// Check if parameter object contains the parameters
	if (fileSpecification->get_Params() != nullptr)
	{
	Console::WriteLine(u"CheckSum: {0}",
		fileSpecification->get_Params()->get_CheckSum());
	Console::WriteLine(u"Creation Date: {0}",
		fileSpecification->get_Params()->get_CreationDate());
	Console::WriteLine(u"Modification Date: {0}",
		fileSpecification->get_Params()->get_ModDate());
	Console::WriteLine(u"Size: {0}", 
		fileSpecification->get_Params()->get_Size());
}

// Get the attachment and write to file or stream
auto fileContent = MakeArray<uint8_t>(fileSpecification->get_Contents()->get_Length());
fileSpecification->get_Contents()->Read(fileContent, 0, fileContent->get_Length());
auto fileStream = System::IO::File::OpenWrite(_dataDir + u"test" + count + u"_out.txt");
fileStream->Write(fileContent, 0, fileContent->get_Length());
fileStream->Close();
count += 1;
}