React Native

Check if a MIME Part is an Attachment

Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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React Native

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

function chilkatExample() {
  // Demonstrates the Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
  // part.  This example iterates the parts of a multipart message and reports which ones match.

  const mime = new Mime();
  try {
    mime.loadMimeFile('qa_data/multipart_message.eml');
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  const n = mime.numParts;
  const part = new Mime();
  for (let i = 0; i < n; i++) {
    try {
      mime.partAt(i, part);
    } catch {
      console.log(mime.lastErrorText);
      return;
    }

    if (part.isAttachment()) {
      console.log(`Part ${i} (${part.contentType}) is an attachment.`);
    }
  }
}