React Native

Get a Header Field of an Attachment

Demonstrates the Chilkat Email.GetAttachmentHeader method, which returns the value of a named header field of an attachment. The first argument is the zero-based attachment index and the second is the MIME header-field name. This example reads the Content-Disposition header of the first attachment.

Background: Each attachment is a MIME part with its own header block. Where GetAttachmentAttr extracts a single named parameter, GetAttachmentHeader returns the entire value of a header field — for example the full Content-Disposition: attachment; filename="notes.txt" line. That is useful for inspecting or debugging exactly how a part is described, including any custom X- headers a sender may have added.

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React Native

import { Email } from '@chilkat/react-native'

function chilkatExample() {
  // Demonstrates the GetAttachmentHeader method, which returns the value of a header field
  // (by name) of an attachment.  The first argument is the zero-based attachment index and the second is the
  // MIME header-field name.

  const email = new Email();
  email.subject = 'Attachment header field';

  email.addStringAttachment('notes.txt', 'Some notes.');

  // Get the Content-Disposition header of the first attachment (index 0).
  const disp = email.getAttachmentHeader(0, 'Content-Disposition');
  console.log(`Attachment 0 Content-Disposition: ${disp}`);
}